84 results on '"Chahal, HS"'
Search Results
2. Significant benefits of AIP testing and clinical screening in familial isolated and young-onset pituitary tumors
- Author
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Marques, P, Caimari, F, Hernández-Ramírez, LC, Collier, D, Iacovazzo, D, Ronaldson, A, Magid, K, Lim, CT, Stals, K, Ellard, S, Grossman, AB, Korbonits, M, Abraham, P, Aflorei, E, Agha, A, Ahlquist, J, Akker, SA, Alexandraki, K, Alföldi, S, Anselmo, J, Arlt, W, Atkinson, B, Aulinas-Masó, A, Aylwin, SJ, Baborie, A, Backeljauw, PF, Badiu, C, Baldeweg, S, Ball, S, Bano, G, Barkan, A, Barton, J, Barwell, J, Bates, P, Bernal-González, C, Besser, M, Bevan, JS, Bickerton, A, Blair, J, Bolanowski, M, Bouloux, P, Bradley, L, Bradley, K, Brain, C, Brooke, A, Brown, R, Buchfelder, M, Burren, C, Cakir, M, Canham, N, Capraro, J, Carroll, P, Carter, P, Carty, D, Cavlan, D, Chahal, HS, Cheetham, T, Chentli, F, Choong, C, Christ-Crain, M, Chung, T-T, Clayton, P, Clayton, RN, Cohen, M, Courtney, H, Cove, D, Crowne, E, Cuthbertson, D, Dal, J, Dalantaeva, N, Damjanovic, S, Daousi, C, Darzy, K, Dattani, M, Davies, M, Davies, J, Davis, J, de Castro, M, de Marinis, L, Deal, C, Dénes, J, Dimitri, P, Dorward, N, Dow, G, Drake, W, Druce, M, Drummond, J, Dutta, P, Dzeranova, L, Edén-Engström, B, Eeles, R, Elfving, M, Ellis, K, Elston, M, Emmerson, L, Ezzat, S, Fersht, N, Fica, S, Fischli, S, Fleseriu, M, Forsythe, E, Foulkes, W, Freda, P, Friedman, T, Gadelha, M, Gainsborough, M, Gallacher, S, Gallego, P, Gan, H-W, Georgescu, C, Gevers, E, Gilkes, C, Glynn, N, Goldman, JE, Goldstone, AP, Góth, M, Green, A, Greenhalgh, L, Grieve, J, Griz, L, Guitelman, M, Gürlek, A, Gurnell, M, Hamblin, PS, Hana, V, Harding, P, Hay, E, Hilton, DA, Ho, W, Hong, G, Horváth, K, Howell, S, Howlett, TA, Höybye, C, Hunter, S, Idampitiya, C, Igaz, P, Imran, A, Inder, WJ, Iwata, T, Izatt, L, Jagadeesh, S, Johnston, C, Jose, B, Kaltsas, G, Kaplan, F, Karavitaki, N, Kastelan, D, Katz, M, Kearney, T, Kershaw, M, Khoo, B, Kiraly-Borri, C, Knispelis, R, Kovács, GL, Kumar, A, Kumar, AV, Kun, IZ, Kyriaku, A, Lambrescu, I, Lampe, AK, Laws, ER, Lebek-Szatanska, A, Lechan, RM, Leese, G, Levy, A, Levy, MJ, Lewandowski, K, Lin, E, Lo, J, Lyons, C, Maartens, N, Maghnie, M, Makaya, T, Marcus, H, Niedziela, M, Martin, N, Matsuno, A, McGowan, B, McQuaid, SE, Medic-Stojanoska, M, Mendoza, N, Mercado-Atri, M, Mettananda, S, Mezősi, E, Miljic, D, Miller, KK, Modenesi, S, Molitch, ME, Monson, J, Morris, DG, Morrison, PJ, Mosterman, B, Munir, A, Murray, RD, Musat, M, Musolino, N, Nachtigall, L, Nagi, D, Nair, R, Nelson, R, Newell-Price, J, Nikookam, K, Ogilivie, A, Orme, SM, O´Weickert, M, Pal, A, Pascanu, I, Patócs, A, Patterson, C, Pearce, SH, Giraldi, FP, Penney, L, Perez-Rivas, LG, Pfeifer, M, Pirie, F, Poplawski, N, Popovic, V, Powell, M, Pullan, P, Quinton, R, Radian, S, Randeva, H, Reddy, N, Rees, A, Renals, V, de Oliveira, AR, Richardson, T, Rodd, C, Ross, RJM, Roncaroli, F, Ryan, F, Salvatori, R, Schöfl, C, Shears, D, Shotliff, K, Skelly, R, Snape, K, Soares, BS, Somasundaram, N, Spada, A, Sperber, J, Spoudeas, H, Stelmachowska-Banas, M, Stewart, S, Storr, HL, Strasburger, C, Street, ME, Suter-Widmer, I, Suthers, G, Swords, F, Syro, LV, Swantje, B, Sze, C, Taylor, J, Thakker, RV, Tham, E, Thompson, C, Thorner, MO, Tóth, M, Trainer, PJ, Tsagarakis, S, Twine, G, Tzanela, M, Vadasz, J, Vaidya, B, Vaks, V, Vance, ML, Verkauskiene, R, Von Esch, H, Wass, JA, Waterhouse, M, Webb, S, Weber, A, Wernig, F, Widell, H, Yamada, S, Yap, P, Yarman, S, Yeoh, P, Yoshimoto, K, Yuen, K, and Zammitt, NN
- Abstract
Context\ud \ud Germline mutations in the aryl hydrocarbon receptor-interacting protein (AIP) gene are responsible for a subset of familial isolated pituitary adenoma (FIPA) cases and sporadic pituitary neuroendocrine tumors (PitNETs).\ud \ud \ud \ud Objective\ud \ud To compare prospectively diagnosed AIP mutation-positive (AIPmut) PitNET patients with clinically presenting patients and to compare the clinical characteristics of AIPmut and AIPneg PitNET patients.\ud \ud \ud \ud Design\ud \ud 12-year prospective, observational study.\ud \ud \ud \ud Participants & Setting\ud \ud We studied probands and family members of FIPA kindreds and sporadic patients with disease onset ≤18 years or macroadenomas with onset ≤30 years (n = 1477). This was a collaborative study conducted at referral centers for pituitary diseases.\ud \ud \ud \ud Interventions & Outcome\ud \ud AIP testing and clinical screening for pituitary disease. Comparison of characteristics of prospectively diagnosed (n = 22) vs clinically presenting AIPmut PitNET patients (n = 145), and AIPmut (n = 167) vs AIPneg PitNET patients (n = 1310).\ud \ud \ud \ud Results\ud \ud Prospectively diagnosed AIPmut PitNET patients had smaller lesions with less suprasellar extension or cavernous sinus invasion and required fewer treatments with fewer operations and no radiotherapy compared with clinically presenting cases; there were fewer cases with active disease and hypopituitarism at last follow-up. When comparing AIPmut and AIPneg cases, AIPmut patients were more often males, younger, more often had GH excess, pituitary apoplexy, suprasellar extension, and more patients required multimodal therapy, including radiotherapy. AIPmut patients (n = 136) with GH excess were taller than AIPneg counterparts (n = 650).\ud \ud \ud \ud Conclusions\ud \ud Prospectively diagnosed AIPmut patients show better outcomes than clinically presenting cases, demonstrating the benefits of genetic and clinical screening. AIP-related pituitary disease has a wide spectrum ranging from aggressively growing lesions to stable or indolent disease course.
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- 2020
3. AIP Mediates the Effects of Somatostatin Analogues in Acromegaly – Evidence from Clinical and Experimental Studies.
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Chahal, HS, primary, Alband, N, additional, Ansorge, O, additional, Karavitaki, N, additional, Carlsen, E, additional, Wass, JAH, additional, Grossman, AB, additional, and Korbonits, M, additional
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- 2010
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4. Screening of antioxidant property of Eclipta alba
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Mittal, Rohit, primary, Kumar, R, primary, and Chahal, HS, primary
- Published
- 2018
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5. Antimicrobial activity of Ocimum sanctum leaves extracts and oil
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Mittal, Rohit, primary, Kumar, R, primary, and Chahal, HS, primary
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- 2018
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6. Antimicrobial activity of Ocimum sanctum leaves extracts and oil
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Mittal, Rohit, Kumar, R, Chahal, HS, Mittal, Rohit, Kumar, R, and Chahal, HS
- Abstract
The aim of this study was to evaluate the antimicrobial effects of ethanol, Hexane and Chloroform leaf extracts of O. sanctum against pathogenic bacteria to determine their potentials as antibacterial agent. Ocimum sanctum Linn known as Holy Basil is an aromatic plant native to the tropics of Asia and Africa being medicinally important plant in the family Lamiaceae. The family Lamiaceae is one of the most exploited medicinal plant family worldwide not only as a source of medicinal plants but also with its valuable essential oils being used as spices and flavours for various food products. Leaves have petioles, and are ovate, up to 5 cm long, usually slightly toothed. Leaves were separated from the stem, washed in clear water and dried until they were adequately dry to be ground (dried for 7 days). Dried leaves were powdered separately in an electric grinder until a homogenous powder was obtained. Ethanolic, Hexane, Chloroform extract was prepared from the powder obtained using “cold extraction method. The activity of Tulsi extract against K. pneumonia & Staphylococcus aureus was found to be higher at a concentration of 100% followed by 75% & 50% respectively. The maximum zone of inhibition was found to be 21&11mm against Kleibsiella pneumonia and 18&15mm against Staphylococcus aureus. The antimicrobial efficacy of Ocimum sanctum leaves indicates that the plant possesses potent antimicrobial properties as well as Ocimum is widespread in India, it can be recommended as an easily available and renewal source of antimicrobial agent instead of synthetic chemicals. Keywords: Ocimum santum, Staphylococcus aureus, Klebsialla pneumonia, Disc Diffusion
- Published
- 2018
7. Screening of antioxidant property of Eclipta alba
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Mittal, Rohit, Kumar, R, Chahal, HS, Mittal, Rohit, Kumar, R, and Chahal, HS
- Abstract
The aim of the study was to examine the possible antioxidant activities of the methanolic extracts of medicinal plants, Eclipta alba. We examined for such properties such as nitric oxide radical scavenging assay, DPPH radical scavenging activity. Free radicals are atoms or molecules that have one or more unpaired electrons on its outer orbital, highly reactive, and could damage cell inside human body. Human body produce antioxidant to neutralize free radicals, but human ageing and stress oxidative conditions would increase the formation of free radicals, therefore an exogenous antioxidant are needed. Asteraceae is the largest family among the plant kingdom, therefore it has a great potential as source of exogenous antioxidant. The flavonoid content of the plant extract was estimated by the method of (Lamaison and Carnat, 1990). Briefly 1.0 ml of plant extract was mixed with 1.0 ml of aluminium chloride reagent and resultant colour was read at 430 nm. The flavonoid content of the extract was expressed as mg quercetin equivalent/gm dry wt. of extract. The coarsely powdered plant materials of Eclipta alba (2000 g) were extracted separately to exhaustion in Soxhlet apparatus for 72 hours by using methanol solvent The crude extract was filtered using 125 mm Whatman® qualitative filter paper under sterile condition. A methanol solution of the sample at various concentrations was added to 0.5 ml of 0.1 mM methanolic solution of DPPH and allowed to stand for 30 min at 25°C in darkness. The absorbance of the sample was measured at 517 nm. A 0.1 mM solution of DPPH in methanol was used as control, whereas ascorbic acid was used as reference standard. The absorbance of the pink chromophore formed during the diazotization of the nitrite with sulphanilamide and the subsequent coupling with naphthyl ethylenediamine dihydrochloride was measured at 546 nm. The percentage of inhibition of the extract shown 39% in 25µg and in 100µg it was 73 percent.
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- 2018
8. Assessment of p27 (cyclin-dependent kinase inhibitor 1B) and aryl hydrocarbon receptor-interacting protein (AIP) genes in multiple endocrine neoplasia (MEN1) syndrome patients without any detectable MEN1 gene mutations
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Igreja, S, Chahal, HS, Akker, SA, Gueorguiev, M, Popovic, V, Damjanovic, S, Burman, P, Wass, JA, Quinton, R, Grossman, AB, and Korbonits, M
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congenital, hereditary, and neonatal diseases and abnormalities ,endocrine system ,endocrine system diseases - Abstract
OBJECTIVE: Germline mutations in the MEN1 gene predispose to the multiple endocrine neoplasia (MEN1) syndrome; however, approximately 10-20% of patients with MEN1 do not have a detectable MEN1 mutation. A rat strain with multiple endocrine tumours, a phenotypic overlap of both MEN1 and MEN2, has been reported to have a homozygous germline p27 (CDKN1B) mutation. Recently, two MEN1 mutation-negative MEN1 syndrome patients have been identified to harbour a germline CDKN1B mutation. The recently identified gene AIP can also cause familial isolated pituitary adenoma, but no other specific tumour is associated with this syndrome. The objective of this study was to evaluate the possible contribution of CDKN1B and AIP germline mutations in a cohort of MEN1 mutation-negative MEN1 syndrome patients. PATIENTS: Eighteen sporadic and three familial cases of MEN1 mutation-negative MEN1 syndrome were studied (18 pituitary adenomas, 12 hyperparathyroidism, 10 neuroendocrine tumours including 2 ACTH-secreting lesions and one adrenal nodular hyperplasia). Clinical data and genomic DNA were analysed for mutations in the CDKN1B and AIP genes. RESULTS: There were no mutations in the coding region or exon/intron junction of the CDKN1B and AIP genes in any patient. Although we have a limited number of patients in our cohort, our data is consistent with others in the literature suggesting that CDKN1B and AIP mutations are extremely rare in MEN1 syndrome. CONCLUSION: Our results suggest that mutations in the CDKN1B and AIP genes are relatively uncommon in MEN1 mutation-negative MEN1 syndrome patients.
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- 2016
9. The Impact of Employee Sycophantic Behaviour on Organisation Environment: A Conceptual Study of Hospitality Sector in India
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Chahal Hs and Poonam B
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business.industry ,media_common.quotation_subject ,General Medicine ,Public relations ,Private sector ,Competitive advantage ,Personal development ,Promotion (rank) ,Team Spirit ,Sociology ,Praise ,Cronyism ,business ,Tertiary sector of the economy ,media_common - Abstract
In today competitive environment, sycophantic behaviour played in every organisation significant role and the organisation environment also influenced by this behaviour. If we go into deep discussion, we realize as well that this behaviour is behaviour to get competitive advantage for personal growth. It is also observed that, performance of organisation depends upon the surrounding as read in many HRM books that “Good environment leads to good performance of any companies”. Service industry required team spirit for increasing performance level and for that behaviour is generally being adopted by the employees to please their bosses. Some questions arise like: 1) what does sycophancy means? 2) How does it influence the environment? And does have positive impact on employee Performance? To do Oiling and battering to their bosses to get promotion and good place in the industry is known as sycophancy. According Ekong and Essien, the sycophantic groups are those who involve more in intrigues, lying about others to cause confusion-official liar and those who pretend to be the adviser to the political leader. But their false praise performance and outputs may vary. The above matter can be seen in private sector as well in public or government sector also at some extent. But if we talk about government sector, Jhatial found in his study that 80% of respondents in government sector agreed that connection or sifarish, references, sycophancy and cronyism play significant role in HRM decision making process whereas only 20% of respondents found that it have done on merit based decision.
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- 2015
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10. The Impact of Employee Sycophantic Behaviour on Organisation Environment: A Conceptual Study of Hospitality Sector in India
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Poonam B, Chahal HS, primary
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- 2015
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11. The endocrine system and ageing
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Chahal, HS, primary and Drake, WM, additional
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- 2007
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12. Oligogenic inheritance in severe adult obesity.
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Almansoori S, Alsters SI, Yiorkas AM, Nor Hashim NA, Walters RG, Chahal HS, Purkayastha S, Lessan N, and Blakemore AIF
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- Humans, Male, Adolescent, Adult, Female, Genetic Predisposition to Disease, Mutation, Penetrance, United Kingdom epidemiology, Pakistan, Multifactorial Inheritance genetics, Obesity, Morbid genetics, Exome Sequencing, Pedigree
- Abstract
Background/objective: The genetic architecture of extreme non-syndromic obesity in adults remains to be elucidated. A range of genes are known to cause monogenic obesity, but even when pathogenic mutations are present, there may be variable penetrance., Methods: Whole-exome sequencing (WES) was carried out on a 15-year-old male proband of Pakistani ancestry who had severe obesity. This was followed by family segregation analysis, using Sanger sequencing. We also undertook re-analysis of WES data from 91 unrelated adults with severe obesity (86% white European ancestry) from the Personalised Medicine for Morbid Obesity (PMMO) cohort, recruited from the UK National Health Service., Results: We identified an oligogenic mode of inheritance of obesity in the proband's family-this provided the impetus to reanalyze existing sequence data in a separate dataset. Analysis of PMMO participant data revealed two further patients who carried more than one rare, predicted-deleterious mutation in a known monogenic obesity gene. In all three cases, the genes involved had known autosomal dominant inheritance, with incomplete penetrance., Conclusion: Oligogenic inheritance may explain some of the variable penetrance in Mendelian forms of obesity. We caution clinicians and researchers to avoid confining sequence analysis to individual genes and, in particular, not to stop looking when the first potentially-causative mutation is found., (© 2024. The Author(s).)
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- 2024
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13. Comparison of Efficacy and Safety of a Combination of Tamsulosin and Mirabegron versus Tamsulosin Alone in the Management of Overactive Bladder in Males with Lower Urinary Tract Symptoms - TAME-Overactive Bladder: An Open-labeled Randomized Controlled Trial.
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Anwar A, Gorka V, Chahal HS, Sharma S, Tandon S, Singhal N, Narwade PC, Chauhan N, Bansal N, and Kaur S
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Background: Overactive bladder (OAB) is a common condition in elderly men with coexisting benign prostatic enlargement (BPE), and it significantly impairs their quality of life (QoL)., Aim: This study aimed to assess the safety and efficacy of adding beta-3 adrenergic receptor agonist (mirabegron 50 mg) to tamsulosin 0.4 mg for symptomatic men with BPE and OAB symptoms (OABS)., Materials and Methods: It was an open-labeled randomized controlled trial. Ninety men with BPE and International Prostate Symptom Score (IPSS) of more than seven with predominant OABS were enrolled for the study. A detailed history, uroflowmetry, and baseline scores, including IPSS, OABS score (OABSS), and QoL assessment, were done for each patient. After written informed consent, patients were randomized into two groups of 45 each. Group-1 received tamsulosin 0.4 mg and placebo, and Group-2 received a combination of tamsulosin 0.4 mg plus mirabegron 50 mg once daily at bedtime. Follow-up of patients was done at 2
nd , 4th , and 8th weeks. Efficacy at 8 weeks was assessed using repeat history for symptoms, uroflowmetry, IPSS, OABSS, and QoL score., Results: After 8 weeks of therapy, collected data were compared to baseline parameters in both groups. Significant improvement with respect to OABSS ( P = 0.046), IPSS ( P = 0.006), and QoL ( P = 0.038) was observed with combination therapy versus tamsulosin alone. There were mild adverse effects, which were self-limiting., Conclusions: A combination of tamsulosin with mirabegron is effective and safe in improving the OABSS, IPSS, and QoL in men with BPE who have predominant OABS., Competing Interests: There are no conflicts of interest., (Copyright: © 2023 International Journal of Applied and Basic Medical Research.)- Published
- 2023
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14. Role of Fine Needle Aspiration Cytology in the Rapid Diagnosis of Pulmonary Infections in Renal Allograft Recipients with Respiratory Failure.
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Selhi PK, Chahal HS, Wadhwa H, Kaur S, Selhi KS, Kaur H, Kashyap AK, and Singh A
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Background: Renal transplantation is the treatment of choice in patients with end-stage renal disease. However, allograft recipients are at a higher risk of infection due to immunosuppressive therapies. This study aimed to analyze the utility of fine needle aspiration cytology (FNAC) lung in the etiological diagnosis of pulmonary infections in renal allograft recipients with respiratory failure., Materials and Methods: This is a retrospective study done in post-renal transplant patients presenting with pulmonary infections and respiratory failure in the past 7 years, in whom image-guided lung FNAC was done for diagnosis., Results: A total of 35 renal allograft recipients presenting with respiratory failure and having focal or diffuse pulmonary opacities (lesions) on radiological imaging were subjected to lung FNAC. The mean age of the patients was 41.1 ± 11.8 years (range 19-72), with the majority being males ( n = 28, 80%); six (17.1%) of them were on invasive ventilation. The diagnostic yield of FNAC in our cohort was 77.1% (27 out of 35). Microorganisms were isolated in 21 cases (60%), with Nocardia being the most common (nine cases, 25.7%), Mycobacterial tuberculosis identified in six patients (17.1%), Aspergillus in three (8.6%), and one (2.9%) each had atypical Mycobacterium , zygomycetes, and Cryptococcus . FNAC suggested viral cytopathic effect in five patients, and cytomegalovirus (CMV) quantitative polymerase chain reaction test was found positive in four of these. One case was diagnosed as adenocarcinoma lung., Conclusion: Lung FNAC is a useful for establishing the etiological diagnosis of pulmonary lesions in renal transplant patients with respiratory failure., Competing Interests: There are no conflicts of interest., (Copyright: © 2023 Indian Journal of Nephrology.)
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- 2023
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15. Synchronous Clear Cell and Papillary Renal Cell Carcinoma: Dual Tumour of Same Kidney.
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Narang V, Jindal S, Soni A, Kaur H, Ahluwalia A, Kakkar C, and Chahal HS
- Abstract
Competing Interests: Conflict of InterestThe authors declare no competing interests.
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- 2022
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16. Use of US Food and Drug Administration Expedited Drug Development and Review Programs by Orphan and Nonorphan Novel Drugs Approved From 2008 to 2021.
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Monge AN, Sigelman DW, Temple RJ, and Chahal HS
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- United States, Humans, United States Food and Drug Administration, Pharmaceutical Preparations, Cross-Sectional Studies, Drug Approval, Biological Products
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Importance: The US Food and Drug Administration (FDA) has 4 programs that can be used alone or in combination to expedite drug availability: Accelerated Approval, Breakthrough Therapy, Fast Track, and Priority Review. Drugs using these programs can include novel drugs, which do not contain a previously FDA-approved active moiety, and orphan drugs, intended for diseases or conditions affecting fewer than 200 000 people; to date, no comprehensive evaluation of how these programs have been used in combination has been published., Objective: To assess how often and in what combinations expedited programs are used in the development and review of approved novel biologics and small-molecule drugs, stratified by orphan drug status and indication., Design, Setting, and Participants: This cross-sectional study evaluated all novel drugs that were FDA approved between January 1, 2008, and December 31, 2021., Main Outcomes and Measures: The main outcome was the frequency with which expedited programs were used and in what combinations, stratified by orphan drug status and drug type (small molecule vs therapeutic biologic). The unit of analysis was the novel drug-indication pair because a drug can be approved for multiple indications, each of which may use a different expedited program or differ in orphan drug status., Results: The study included 581 novel drug-indication pairs approved during the 14-year study period; 252 (43.4%) were orphan drugs, 139 (23.9%) were therapeutic biologics, and 442 (76.1%) were small-molecule drugs. Use of at least 1 expedited program increased from 11 of 26 drug-indication pairs (42.3%) in 2008 to 41 of 55 (74.5%) in 2021. Of the 363 approved drug-indication pairs using at least 1 expedited program, 225 (62.0%) were orphan drugs; at least 1 expedited program was used by 97 of the 139 approved biologic drugs (69.8%) and by 266 of the 442 approved small-molecule drugs (60.2%). Eighty-two of the 581 novel drug-indication pairs (14.1%) used the Accelerated Approval Program; of those, 65 (79.3%) were oncology drugs and 70 (85.4%) had an orphan designation., Conclusions and Relevance: The study showed that use of the FDA's expedited programs to bring novel drugs to market in the US increased from 2008 to 2021. The findings suggest that this trend is likely to continue.
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- 2022
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17. Clinical Profile and Outcome in Patients of Complicated Urinary Tract Infections: A Single-Center Prospective Observational Study.
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Jindal J, Meelu A, Kaur S, Chahal HS, Makkar V, and Garg V
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Background: Complicated urinary tract infection (cUTI) is the one which is associated with structural and functional abnormalities of the urinary tract, thus increasing the risk of infection and failure of therapy., Aim: This study aims to determine the risk factors, changing trends in etiology, current treatment options, and outcomes in cUTI., Materials and Methods: This prospective observational study was done on patients presenting with cUTI. Hematological, biochemical workup, urine routine, urine culture, blood culture, ultrasonography, and wherever necessary computerized tomography of the genitourinary tract was done. The medical/surgical interventions and outcomes in these patients were recorded., Results: A total of 100 patients were enrolled in the study. Diabetes mellitus was the most common risk factor present in 53%. The most common organism isolated in urine culture was Escherichia coli (48%) followed by Klebsiella pneumoniae (19%) and similar trend but lesser positive yield was there in blood culture ( Escherichia coli - 26% followed by Klebsiella pneumoniae - 3%). The organisms were most susceptible to colistin/polymyxin (100%) followed by carbapenems (88%), and later were the most commonly used empirical antibiotics in our study, yielding 95% survival rate. Surgical interventions (percutaneous/endourological) were required in 28%, renal replacement therapy in 14%, intensive care in 40% and mechanical ventilation in 10%, with 4% overall mortality at the end of 1-month follow-up. The mean duration of hospital stay was 9.1 ± 2.7 days., Conclusion: Escherichia coli was the most common organism causing cUTI, with diabetes being the most common risk factor. Most of the patients were treated with carbapenems with excellent survival outcomes., Competing Interests: There are no conflicts of interest., (Copyright: © 2022 International Journal of Applied and Basic Medical Research.)
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- 2022
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18. Characteristics and Outcomes of Products Seeking Competitive Generic Therapy Designation and Exclusivity.
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Chahal HS, Fowler AC, Patel R, and Shimer M
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- Cross-Sectional Studies, Drug Approval legislation & jurisprudence, United States, United States Food and Drug Administration, Drug Approval statistics & numerical data, Drugs, Generic
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- 2021
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19. Bilateral Craniofacial Cleft (Tessier Type 4): Case Report and Oculoplastic Reconstruction.
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Chahal HS, Viruni N, Patel R, and Glover AT
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- Eyelids surgery, Face, Humans, Cleft Lip diagnostic imaging, Cleft Lip surgery, Cleft Palate diagnostic imaging, Cleft Palate surgery, Surgery, Plastic
- Abstract
Bilateral Tessier type 4 craniofacial clefts are extremely rare and disfiguring malformations with vision-threatening ramifications. To date, there is no consensus in the literature with respect to the ideal surgical technique and management of these patients. Emergent eyelid reconstruction and additional procedures may be required to protect the cornea and avoid further ophthalmic and surgical complications. We present our experience and challenges of managing a case of bilateral Tessier type 4 clefting with an emphasis on oculoplastic considerations.
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- 2021
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20. Botulinum Toxin for the Treatment of Intractable Raynaud Phenomenon.
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Shwe S, Sharma AA, Chahal HS, Doan LT, and Rojek NW
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- Humans, Botulinum Toxins, Neuromuscular Agents, Raynaud Disease drug therapy
- Published
- 2021
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21. A Randomized Controlled Trial to Study the Rationale of Antibiotic Prophylaxis in Diagnostic Rigid Cystoscopy: A Relook in The Era of Antibiotic Stewardship.
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Chahal HS, Sikka S, Kaur S, Mittal V, Aulakh BS, and Sharma S
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Background: In the era of widespread antibiotic (AB) resistance, the role of prophylaxis in diagnostic cystoscopy is controversial., Aim: This study aimed to compare the incidence of postcystoscopy positive urinary culture (PC-PUC) and urinary tract infection (UTI) in patients undergoing diagnostic rigid cystoscopy with and without prophylaxis with preprocedural single-dose intravenous AB., Materials and Methods: This prospective study was done in patients with preprocedural sterile urine undergoing elective diagnostic rigid cystoscopy. Patients were randomized into two groups, with one group receiving preprocedure single dose of intravenous cefuroxime sodium as prophylaxis half to 1 h before the procedure (Group AB prophylaxis) and the other group receiving no antibiotic prophylaxis (Group NAB). All patients were followed up till 1-month postprocedure, for any symptoms of urinary infection, mandatory urine microscopy and culture at 24-48 h, 1 week and 4 weeks post procedure, and addition sample in case of any urinary symptoms or fever., Results: A total of 225 patients were studied, with 110 in AB prophylaxis and 115 in NAB groups. The use of prophylaxis did not decrease the incidence of PC-PUC (8.7%-3.6%; P = 0.167) or UTI (6.1%-1.8%; P = 0.102). Females and diabetics had significantly higher risk of PC-PUC, on univariate and multivariate analysis, not affected by prophylaxis., Conclusion: Preprocedural AB prophylaxis does not decrease the incidence of postcystoscopy bacteriuria significantly. Females and diabetics have significantly increased risk, but prophylaxis has no role in them either., Competing Interests: There are no conflicts of interest., (Copyright: © 2021 International Journal of Applied and Basic Medical Research.)
- Published
- 2021
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22. Contents of US Food and Drug Administration Refuse-to-File Letters for New Drug Applications and Efficacy Supplements and Their Public Disclosure by Applicants.
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Chahal HS, Mukherjee S, Sigelman DW, and Temple R
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- Cross-Sectional Studies, United States, United States Food and Drug Administration standards, Disclosure, Drug Approval
- Abstract
Importance: Before reviewing drug applications, the US Food and Drug Administration (FDA) conducts "filing reviews" to assess whether they are complete enough for full review. If the applications are incomplete, the FDA issues refuse-to-file (RTF) letters identifying deficiencies. The FDA does not make these RTF letters public at the time of issuance. Why the FDA issues RTF letters and how often the letters and their contents are made publicly available are unknown., Objectives: To quantitatively analyze the FDA's reasons for issuing RTF letters and assess the public transparency of RTF letters and their contents., Design and Setting: This cross-sectional study analyzes RTF letters issued in response to new drug applications and efficacy supplements (applications for new indications or patient populations for already approved drugs) submitted to the FDA between January 1, 2008, and December 31, 2017. Statistical analysis was conducted in July 2019., Main Outcomes and Measures: Two types of information were extracted and cataloged from RTF letters: (1) the reasons why the FDA refused to file applications and (2) the FDA comments that, while not a basis for RTF letters, conveyed important information to applicants. The extent to which applicants publicly disclosed the FDA's refusal reasons were also assessed., Results: The study included 103 RTF letters containing a total of 644 identified FDA refusal reasons. Among the 2475 applications that the FDA received during the study time frame, 98 (4.0%) received RTF letters. Overall, 84.5% (544 of 644) of the refusal reasons were for scientific deficiencies; most reasons were related to drug efficacy and safety (196 [30.4%]) and drug quality (125 [19.4%]). The remaining 15.5% of refusal reasons (100 of 644) were for application organization deficiencies or legal issues. A total of 26.2% of the RTF letters (27 of 103) identified presubmission advice from the FDA that applicants did not follow; the most frequently ignored advice was related to clinical trial design (33.3% [9 of 27]), followed by product chemistry and manufacturing (25.9% [7 of 27]). Applicants publicly disclosed the existence of 16 of 103 RTF letters (15.5%); however, only 5.4% of applicant-disclosed reasons (35 of 644) matched the refusal reasons that the FDA had provided in the RTF letters., Conclusions and Relevance: This cross-sectional study found that the FDA refused to file applications for substantive reasons related to quality, safety, and efficacy, and applicants' disclosure of those reasons was incomplete. This work sheds light on the FDA's regulatory decision-making processes and the RTF reasons that could delay availability of therapies to patients.
- Published
- 2021
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23. Pregnancy-related acute kidney injury and urological comorbidities in morbidly adherent placenta: A potential challenge to AKI-0by25.
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Chahal HS, Juneja SK, Kaur S, Kochar B, Sharma S, and Makkar V
- Subjects
- Acute Kidney Injury diagnosis, Acute Kidney Injury therapy, Adult, Blood Transfusion, Female, Hemostasis, Surgical, Humans, Hysterectomy, Incidence, India epidemiology, Middle Aged, Placenta Accreta diagnosis, Placenta Accreta surgery, Placenta Previa diagnosis, Placenta Previa surgery, Pregnancy, Prospective Studies, Risk Assessment, Risk Factors, Time Factors, Treatment Outcome, Young Adult, Acute Kidney Injury epidemiology, Placenta Accreta epidemiology, Placenta Previa epidemiology
- Abstract
Pregnancy-related acute kidney injury (PRAKI) and urological complications can significantly increase the maternal morbidity and mortality, and morbidly adherent placenta (MAP) has been found to increase the risk of both. This is a four-year prospective study, conducted on patients with MAP. Baseline parameters (demographic/antenatal/perinatal), operative details (obstetric/urological/hemostatic), peri-operative complications (AKI/urological), and maternal/fetal outcomes were studied till six weeks after delivery. Statistical analysis was done using IBM SPSS Statistics version 21.0, and P <0.05 was considered statistically significant. Out of the 5475 deliveries conducted in the study period, 64 had adherent placentation. AKI occurred in 39.1% of patients, with severe AKI (AKIN-2, 3) in 10.9%, and significantly higher incidence in placenta percreta (P = 0.021, relative risk [RR] - 2.34), urological injuries (P = 0.001, RR - 2.86), and high blood loss (P = 0.001) on univariate analysis, but placenta percreta was the most statistically significant factor P = 0.049) on multivariate analysis. Urological involvement/injuries requiring intervention were encountered in 22 patients, with statistically significantly high incidence in placenta previa (P = 0.023, RR - 1.62), placenta percreta (P = 0.000, RR - 17.18), and patients undergoing hysterectomy (P = 0.000, RR - 2.01) on univariate analysis, but placenta percreta was most statistically significantly implicated on multivariate analysis (P = 0.017). AKI and urological injuries significantly increased the need for intensive care and days of hospitalization. On six-week follow-up, all AKI patients recovered completely; no urinary leak or vesico-vaginal fistula was seen in urologically intervened patients and no maternal mortality occurred. There is an alarmingly high incidence of PRAKI and urological complications in MAP, posing a great threat to their worldwide improving statistics. Awareness of this condition among renal fraternity can significantly improve the maternal renal and overall prognosis.
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- 2020
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24. Metabolic Changes and Diabetes Microvascular Complications 5 Years After Obesity Surgery.
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Miras AD, Ravindra S, Humphreys A, Lascaratos G, Quartey KNK, Ahmed AR, Cousins J, Moorthy K, Purkayastha S, Hakky S, Tan T, and Chahal HS
- Subjects
- Adult, Aged, Albuminuria diagnosis, Albuminuria epidemiology, Albuminuria metabolism, Diabetes Mellitus, Type 2 complications, Diabetes Mellitus, Type 2 epidemiology, Diabetes Mellitus, Type 2 metabolism, Diabetic Angiopathies diagnosis, Diabetic Angiopathies epidemiology, Diabetic Angiopathies metabolism, Female, Follow-Up Studies, Humans, Male, Middle Aged, Obesity, Morbid complications, Obesity, Morbid metabolism, Retrospective Studies, Treatment Outcome, Weight Loss, Albuminuria etiology, Bariatric Surgery methods, Diabetes Mellitus, Type 2 surgery, Diabetic Angiopathies etiology, Obesity, Morbid surgery, Postoperative Complications diagnosis, Postoperative Complications epidemiology, Postoperative Complications metabolism
- Abstract
Background: Obesity surgery has pronounced effects on metabolic profile of patients with type 2 diabetes mellitus (T2DM); however, reports on long-term remission rates based on the standardised and holistic criteria by the International Diabetes Federation (IDF) and effects on T2DM microvascular complications are scarce in the literature. In this retrospective clinical trial, our objectives were to assess these variables 5 years after surgery., Methods: Clinical data and direct measurements of renal and retinal damage were collected prospectively and analysed retrospectively for 82 patients with T2DM who underwent obesity surgery and were followed up for 5 years., Results: The cohort of 82 patients with T2DM that were followed up 5 years after obesity surgery was predominantly female (71%) with a median age of 51 years, weight of 133.5 kg, BMI of 46.8 kg/m
2 and pre-operative duration of T2DM of 8 years; 6% of patients had diet-controlled T2DM, 57% were on non-insulin treatment and 37% were on insulin treatment pre-operatively. Of the total 82 patients, 59 patients underwent Roux-en-Y gastric bypass, 15 sleeve gastrectomy and 8 patients underwent gastric band operations. At 5 years, 5% and 15% patients achieved optimisation and improvement of the metabolic state based on the IDF criteria respectively. Surgery was associated with almost halving of the albumin-creatinine ratio in 22 patients with pre-existing albuminuria (follow-up data available for 64 patients) and an overall stabilisation of retinopathy in 24 patients with retinal images available at 5 years., Conclusion: Whilst the findings on microvascular complications are encouraging, the rates of metabolic remission were lower than expected and raise the need for validated protocols to assist clinicians in managing these patients more aggressively post-operatively to achieve optimum cardio-metabolic risk factor control and hopefully further reduction in microvascular and macrovascular complications.- Published
- 2019
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25. Relation of outbursts of anger and the acute risk of placental abruption: A case-crossover study.
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Chahal HS, Gelaye B, Mostofsky E, Salazar MS, Sanchez SE, Ananth CV, and Williams MA
- Subjects
- Abruptio Placentae psychology, Acute Disease, Adult, Cross-Over Studies, Female, Humans, Pregnancy, Risk Factors, Stress, Psychological diagnosis, Stress, Psychological psychology, Abruptio Placentae etiology, Anger, Stress, Psychological complications
- Abstract
Background: Roughly, a fourth of all placental abruption cases have an acute aetiologic underpinning, but the causes of acute abruption are poorly understood. Studies indicate that symptoms of stress, depression, and anxiety during pregnancy may be associated with a higher risk of abruption., Objective: We examined the rate of abruption in the 2 hours immediately following outbursts of anger., Methods: In a multicentre case-crossover study, we interviewed 663 women diagnosed with placental abruption admitted to one of the seven Peruvian hospitals between January 2013 and August 2015. We asked women about outbursts of anger before symptom onset and compared this with their usual frequency of anger during the week before abruption., Results: The rate of abruption was 2.83-fold (95% confidence interval [CI] 1.85, 4.33) higher in the 2 hours following an outburst of anger compared with other times. The rate ratio (RR) was lower for women who completed technical school or university (RR 1.38, 95% CI 0.52, 3.69) compared to women with secondary school education or less (RR 3.73, 95% CI 2.32, 5.99, P-homogeneity = .07). There was no evidence that the association between anger episodes and abruption varied by hypertensive disorders of pregnancy (ie preeclampsia/ eclampsia) or antepartum depressive symptoms., Conclusion: There was a higher rate of abruption in the 2 hours following outbursts of anger compared with other times, providing potential clues to the aetiologic mechanisms of abruption of acute onset., (© 2019 John Wiley & Sons Ltd.)
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- 2019
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26. An Evaluation of US Food and Drug Administration's Program to Register HIV Drugs for Use in Resource-Constrained Settings.
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Chahal HS, Koukounas K, Capella P, Presto R, Murray JS, Shimer M, Riley K, and Valdez ML
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- Cross-Sectional Studies, Evaluation Studies as Topic, HIV Infections drug therapy, Health Resources, Humans, Program Evaluation, Time Factors, United States, Anti-Retroviral Agents, Drug Approval statistics & numerical data, United States Food and Drug Administration
- Abstract
Importance: The US Food and Drug Administration (FDA) program to review antiretroviral drugs for use in low-resource settings via the US President's Emergency Plan for AIDS Relief (PEPFAR) now supports treatment of more than 14 million patients with HIV. However, an in-depth evaluation of the program has not been undertaken., Objective: To conduct a quantitative analysis of the FDA-reviewed antiretroviral drug applications in order to assess the contributions of PEPFAR and to identify areas for improvement., Design, Setting, and Participants: A cross-sectional study was conducted of all PEPFAR applications submitted to the FDA from December 1, 2004, to May 31, 2018. The analyses were conducted between October 2018 and February 2019., Main Outcomes and Measures: Numbers and types of applications reviewed, how long it took for applications to obtain approval or tentative approval (time to registration), how often the FDA issued a complete response letter (CRL) identifying deficiencies precluding application approval or tentative approval and their reasons, and the association between CRLs and time to registration., Results: Overall, 260 PEPFAR applications for 327 antiretroviral therapies were reviewed by FDA, of which 216 applications (83%) for 272 drugs were authorized for use. Of the 216 authorized applications, 184 applications for 231 drugs remain in active status and, thus, are available for use. Twenty-six percent (56 of 216) of the applications were for pediatric-specific formulations or strengths; the remainder were for adults. For all 216 applications, the median (interquartile range) time to registration was 10.0 (7.0-17.5) months. Thirty-seven percent (95 of 260) of the applications received 1 or more CRLs, resulting in a total of 172 CRLs; most applications received 1 CRL, whereas some were issued up to 6 CRLs. Among all CRLs, 264 deficiency reasons were identified; the most common deficiencies were associated with manufacturing processes (155 [44%]), followed by product labeling (62 [23%]), and failing facility inspections (54 [20%]). Complete response letters were associated with an increased time to registration. Applications without CRLs had a median (interquartile range) time to registration of 9.0 (5.5-12.0) months, whereas those with at least 1 CRL took a median (interquartile range) of 22.0 (14.0-38.0) months (P < .001)., Conclusions and Relevance: The FDA's PEPFAR program has made many antiretroviral drugs available for global use. However, FDA and the pharmaceutical companies could take steps to improve the quality of applications submitted to prevent avoidable deficiencies in manufacturing processes and labeling. Further efforts to develop better, easier to use pediatric-specific therapies are needed.
- Published
- 2019
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27. Public Disclosure of the Filing of New Drug and Therapeutic Biologics Applications With the US Food and Drug Administration.
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Chahal HS, Szeto D, Chaudhry AH, Sigelman DW, Kim S, and Lurie PG
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- 2019
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28. Physical Exertion Immediately Before Early Preterm Delivery: A Case-Crossover Study.
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Chahal HS, Gelaye B, Mostofsky E, Sanchez SE, Mere JF, Mercado FG, Pacora P, and Williams MA
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- Adult, Cross-Over Studies, Female, Humans, Incidence, Peru epidemiology, Pregnancy, Premature Birth epidemiology, Risk Factors, Physical Exertion, Premature Birth etiology
- Abstract
Background: Occupational exertion is associated with a higher risk of preterm delivery, although studies of leisure time activities generally document reduced risks. Less is known about the risk of preterm delivery immediately following episodes of moderate or heavy physical exertion., Methods: We conducted a case-crossover study of 722 women interviewed during their hospital stay for early preterm delivery, defined by a gestational age before 34 weeks, and after 20 weeks. Interviews occurred between March 2013 and December 2015 in seven hospitals in Lima, Peru., Results: The incidence rate ratio (RR) of early preterm delivery was 5.82-fold higher (95% confidence interval [CI] = 4.29, 7.36) in the hour following moderate or heavy physical exertion compared with other times and returned to baseline in the hours thereafter. The RR of early preterm delivery within an hour of physical exertion was lower for exertion at moderate intensity (RR = 2.43; 95% CI = 1.50, 3.96) than at heavy intensity (RR = 23.62; 95% CI = 15.54, 35.91; P-homogeneity < 0.001). The RR of early preterm delivery was lower in the hour following moderate physical exertion among women who habitually engaged in physical exertion >3 times per week in the year before pregnancy (RR = 1.56; 95% CI = 0.81, 3.00) compared with more sedentary women (RR = 6.91; 95% CI = 3.20, 14.92; P-homogeneity = 0.003)., Conclusions: Our study showed a heightened risk of early preterm delivery in the hour following moderate or heavy physical exertion.
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- 2019
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29. Immediate risk of myocardial infarction following physical exertion, tea, and coffee: A case-crossover study in Thailand.
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Lohsoonthorn V, Rattananupong T, Wynne K, Thomas C, Chahal HS, Berhane HY, Mostofsky E, Wuttithai N, and Gelaye B
- Subjects
- Aged, Caffeine adverse effects, Case-Control Studies, Cross-Over Studies, Female, Humans, Male, Middle Aged, Myocardial Infarction epidemiology, Risk Factors, Thailand epidemiology, Time Factors, Coffee adverse effects, Myocardial Infarction etiology, Physical Exertion, Tea adverse effects
- Abstract
Background: Physical exertion and caffeine consumption are associated with acute myocardial infarction (MI). However, physical exertion and caffeine consumption have not been examined as immediate triggers of MI in low and middle-income countries., Objective: Using a self-matched case-crossover design, we examined the acute risk of MI in the hour following episodes of physical exertion, caffeinated coffee, and tea consumption among MI survivors in Thailand., Methods: A total of 506 Thai participants (women = 191, men = 315) were interviewed between 2014 and 2017 after sustaining an acute MI. We compared each subject's exposure to physical exertion and consumption of caffeine- containing beverages in the hour preceding the onset of MI with the subject's expected usual frequency in the prior year to calculate relative risks (RRs) and 95% confidence intervals (95%CIs)., Results: Of the 506 participants, 47 (9.3%) engaged in moderate or heavy physical exertion, 6 (1.2%) consumed tea, and 21 (4.2%) consumed coffee within the hour before MI. The relative risk of MI after moderate or heavy physical exertion was 3.0 (95% CI 2.2-4.2) compared to periods of no exertion, with a higher risk among more sedentary participants compared to active participants. Compared to times with no caffeinated beverage consumption, there was a higher risk of MI in the hour following consumption of caffeinated tea (RR = 3.7; 95%CI: 1.5-9.3) and coffee (RR = 2.3; 95%CI: 1.4-3.6)., Conclusion: Physical exertion, coffee and tea consumption were associated with a higher risk of MI in the subsequent hour compared to times when the participants were sedentary or did not consume caffeinated beverages. Our study identifies high-risk populations for targeted screening and intervention to prevent acute MI., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
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30. Cost-effectiveness of Hepatitis B Virus Infection Screening and Treatment or Vaccination in 6 High-risk Populations in the United States.
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Chahal HS, Peters MG, Harris AM, McCabe D, Volberding P, and Kahn JG
- Abstract
Background: Two million individuals with chronic hepatitis B (CHB) in the United States are at risk for premature death due to liver cancer and cirrhosis. CHB can be prevented by vaccination and controlled with treatment., Methods: We created a lifetime Markov model to estimate the cost-effectiveness of strategies to prevent or treat CHB in 6 high-risk populations: foreign-born Asian/Pacific Islanders (API), Africa-born blacks (AbB), incarcerated, refugees, persons who inject drugs (PWID), and men who have sex with men (MSM). We studied 3 strategies: (a) screen for HBV infection and treat infected ("treatment only"), (b) screen for HBV susceptibility and vaccinate susceptible ("vaccination only"), and (c) screen for both and follow-up appropriately ("inclusive"). Outcomes were expressed in incremental cost-effectiveness ratios (ICERs), clinical outcomes, and new infections., Results: Vaccination-only and treatment-only strategies had ICERs of $6000-$21 000 per quality-adjusted life-year (QALY) gained, respectively. The inclusive strategy added minimal cost with substantial clinical benefit, with the following costs per QALY gained vs no intervention: incarcerated $3203, PWID $8514, MSM $10 954, AbB $17 089, refugees $17 432, and API $18 009. Clinical complications dropped in the short/intermediate (1%-25%) and long (0.4%-16%) term. Findings were sensitive to age, discount rate, health state utility in immune or susceptible stages, progression rate to cirrhosis or inactive disease, and tenofovir cost. The probability of an inclusive program costing <$50 000 per QALY gained varied between 61% and 97% by population., Conclusions: An inclusive strategy to screen and treat or vaccinate is cost-effective in reducing the burden of hepatitis B virus among all 6 high-risk, high-prevalence populations.
- Published
- 2018
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31. Chahal et al. Respond to "Physical Exertion and Placental Abruption".
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Chahal HS, Gelaye B, and Williams MA
- Subjects
- Case-Control Studies, Cross-Over Studies, Female, Humans, Pregnancy, Abruptio Placentae, Physical Exertion
- Published
- 2018
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32. Physical Exertion Immediately Prior to Placental Abruption: A Case-Crossover Study.
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Chahal HS, Gelaye B, Mostofsky E, Sanchez SE, Mittleman MA, Maclure M, Pacora P, Torres JA, Romero R, Ananth CV, and Williams MA
- Subjects
- Abruptio Placentae etiology, Adult, Cross-Over Studies, Female, Humans, Incidence, Peru epidemiology, Pregnancy, Risk Factors, Young Adult, Abruptio Placentae epidemiology, Physical Exertion, Time Factors
- Abstract
While there is consistent evidence that episodes of physical exertion are associated with an immediately higher risk of acute ischemic vascular events, the risk of placental abruption immediately following episodes of physical exertion has not been studied. In a multicenter case-crossover study, we interviewed 663 women with placental abruption at 7 Peruvian hospitals between January 2013 and August 2015. We asked women about physical exertion in the hour before symptom onset and compared this with their frequency of physical exertion over the prior week. Compared with times with light or no exertion, the risk of placental abruption was 7.8 (95% confidence interval (CI): 5.5, 11.0) times greater in the hour following moderate or heavy physical exertion. The instantaneous incidence rate ratio of placental abruption within an hour of moderate or heavy physical exertion was lower for women who habitually engaged in moderate or heavy physical activity more than 3 times per week in the year before pregnancy (rate ratio (RR) = 3.0, 95% CI: 1.6, 5.9) compared with more sedentary women (RR = 17.3, 95% CI: 11.3, 26.7; P for homogeneity < 0.001), and the rate ratio was higher among women with preeclampsia/eclampsia (RR = 13.6, 95% CI: 7.0, 26.2) than among women without (RR = 6.7, 95% CI: 4.4, 10.0; P for homogeneity = 0.07).
- Published
- 2018
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33. Impact of the US Food and Drug Administration registration of antiretroviral drugs on global access to HIV treatment.
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Chahal HS, Capella P, Presto R, Murray JS, Shimer M, Valdez ML, and Lurie PG
- Abstract
Background: Since 2004, the US Food and Drug Administration's (USFDA) dedicated drug review process in support of President's Emergency Plan for AIDS Relief (PEPFAR) has made safe, effective and quality antiretrovirals (ARVs) available for millions of patients. Furthermore, the WHO and Global Fund to Fight AIDS, Tuberculosis and Malaria (Global Fund) can add the USFDA-reviewed products to their respective formularies, through a novel process of 'one-way reliance'. We assessed the number of ARVs made available through WHO and Global Fund based on the USFDA review., Methods: We conducted a cross-sectional study of all the USFDA-reviewed PEPFAR drugs between 1 December 2014 and 20 March 2017 to determine 1) the percentage that are included on the WHO and Global Fund formularies; 2) the number of the USFDA ARVs supporting the WHO HIV treatment guidelines, and their uptake by WHO and Global Fund and 3) time between the USFDA review and WHO review of the same ARVs., Findings: Overall, 91% (204/224) of the USFDA products appeared on either the WHO/Prequalification of Medicines Programme (PQP) or the Global Fund ARV lists. Forty-five per cent (100/224) and 83% (184/224) appear on WHO/PQP and Global Fund formularies through one-way reliance, respectively. Forty-one per cent (91/224) of the USFDA products support the WHO-preferred first-line HIV treatment options. Of these 91 products, 38% and 85% of products were adopted by WHO/PQP and Global Fund through one-way reliance, respectively. Sixty-six products that were fully reviewed and registered by WHO (vs one-way reliance) had also undergone the USFDA review; 46 of these were registered by WHO after the USFDA review was complete (median delay of 559 days (IQR 233-798 days))., Conclusions: The USFDA's PEPFAR process is making safe and effective ARVs available worldwide, in part because the major global ARV procurement organisations rely on the USFDA registration as proof of quality. There is room for improved information sharing and collaboration to reduce duplication of effort, save resources and further expedite access to ARVs., Competing Interests: Competing interests: None declared.
- Published
- 2018
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34. Scleral Contact Lenses in an Academic Oculoplastics Clinic: Epidemiology and Emerging Considerations.
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Chahal HS, Estrada M, Sindt CW, Boehme JA, Greiner MA, Nerad JA, Carter KD, Allen RC, and Shriver EM
- Subjects
- Adolescent, Adult, Aged, Child, Child, Preschool, Female, Humans, Male, Middle Aged, Retrospective Studies, Young Adult, Contact Lenses, Corneal Diseases therapy, Sclera
- Abstract
Purpose: To describe the role and efficacy of scleral contact lenses (SCLs) in the treatment of progressive keratopathy in patients who have undergone periocular surgical procedures, to investigate the financial impact of these surgical interventions, and to demonstrate the role of oculoplastic surgery in improving scleral contact lens fit., Methods: A retrospective medical record review was performed to identify patients who both received SCLs and were examined by the oculoplastics service at the University of Iowa between January 1990 and December 2015. Inclusion criteria also required a minimum of 12 months of patient follow up after being fit with a SCL. The indication for SCL use, as well as clinical outcomes and cumulative relative value units (RVUs) of prior oculoplastic treatments and SCL therapy were recorded for each patient., Results: Six hundred and fifty-nine patients were fitted with SCLs at the authors' institution during the 25-year study period, 43 of whom were examined by the oculoplastics service for reasons related to their SCL. Patients who were fitted for SCLs before (27 patients) or after (16 patients) evaluation in the oculoplastics clinic presented with a variety of corneal and periocular pathology. Corneal indications for SCLs in patients seen secondarily in the oculoplastics clinic included decreased corneal sensation (from CN V palsy or neurotrophic keratopathy), decreased corneal healing from limbal stem cell deficiency, exposure keratopathy, and keratoconjunctivitis sicca secondary to Sjogren's syndrome or orbital radiation. Indications for oculoplastic clinic evaluation in current scleral lens patients included lagophthalmos, trichiasis, epiphora, cicatricial changes in the eyelids or fornices, and eyelid or eyebrow malposition affecting SCL centration. In all 27 patients, surgical intervention resulted in improved SCL centration. Sixteen patients (5 with CN VII palsy, 4 with CN V and CN VII palsy, 4 with neurotrophic keratitis, and 3 with cicatricial entropion) had progressive corneal decompensation despite primary oculoplastics procedures to protect the cornea and ultimately benefitted from SCL treatment secondarily. Fourteen of these 16 patients demonstrated an improved visual acuity of 1 line or more using SCLs. Procedures performed before referral for SCLs included tarsorrhaphies, gold weights, ectropion repair with lateral tarsal strip, retraction repair with spacer grafts, full-thickness skin grafts, cheek lifts, and punctal occlusion. The total RVUs of these procedures performed per patient were tabulated. The RVU range was 10.47-33.96 with an average of 19.5 RVUs (standard deviation = 9.4 RVUs) per patient., Conclusions: Scleral contact lenses may offer a useful alternative to stabilize the ocular surface, improve vision, and minimize the financial impact and morbidity of multiple periocular procedures in select patients with progressive keratopathy of varying etiologies. The therapeutic indications and utilization of SCLs are likely to increase in oculoplastic practices with optometric support, particularly in academic settings. Surgical correction of eyelid and eyebrow malposition, as well as epiphora, may also be useful adjunctive procedures to optimize SCL fit.
- Published
- 2018
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35. Emergence of Pituitary Adenoma in a Child during Surveillance: Clinical Challenges and the Family Members' View in an AIP Mutation-Positive Family.
- Author
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Marques P, Barry S, Ronaldson A, Ogilvie A, Storr HL, Goadsby PJ, Powell M, Dang MN, Chahal HS, Evanson J, Kumar AV, Grieve J, and Korbonits M
- Abstract
Introduction: Germline aryl hydrocarbon receptor-interacting protein ( AIP ) mutations are responsible for 15-30% of familial isolated pituitary adenomas (FIPAs). We report a FIPA kindred with a heterozygous deletion in AIP , aiming to highlight the indications and benefits of genetic screening, variability in clinical presentations, and management challenges in this setting., Patients: An 18-year-old male was diagnosed with a clinically nonfunctioning pituitary adenoma (NFPA). Two years later, his brother was diagnosed with a somatolactotrophinoma, and a small Rathke's cleft cyst and a microadenoma were detected on screening in their 17-year-old sister. Following amenorrhoea, their maternal cousin was diagnosed with hyperprolactinaemia and two distinct pituitary microadenomas. A 12-year-old niece developed headache and her MRI showed a microadenoma, not seen on a pituitary MRI scan 3 years earlier., Discussion: Out of the 14 members harbouring germline AIP mutations in this kindred, 5 have pituitary adenoma. Affected members had different features and courses of disease. Bulky pituitary and not fully suppressed GH on OGTT can be challenging in the evaluation of females in teenage years. Multiple pituitary adenomas with different secretory profiles may arise in the pituitary of these patients. Small, stable NFPAs can be present in mutation carriers, similar to incidentalomas in the general population. Genetic screening and baseline review, with follow-up of younger subjects, are recommended in AIP mutation-positive families.
- Published
- 2018
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36. Isolated cranio-orbitofacial neurofibroma mimicking vascular malformation.
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Chahal HS, Kuiper B, Braich PS, and Glover AT
- Subjects
- Brain Neoplasms surgery, Craniotomy, Diagnosis, Differential, Exophthalmos diagnosis, Facial Neoplasms surgery, Humans, Lymphangioma diagnosis, Magnetic Resonance Imaging, Male, Neurofibroma surgery, Ophthalmologic Surgical Procedures, Orbital Neoplasms surgery, Young Adult, Brain Neoplasms diagnosis, Facial Neoplasms diagnosis, Neurofibroma diagnosis, Orbital Neoplasms diagnosis, Vascular Malformations diagnosis
- Abstract
Isolated neurofibromas in the absence of systemic neurofibromatosis are known as solitary or localized neurofibromas. When present in the orbit, these lesions may appear clinically and radiographically similar to other tumors, complicating diagnosis and management. Key radiographic signs may guide clinicians to the correct diagnosis when the presentation and patient demographic data obfuscate the disease entity. We present a case of a large multi-lobulated neurofibroma misdiagnosed as a lymphangioma. A brief review of these tumors emphasizing key radiographic features is also included.
- Published
- 2018
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37. The US Food and Drug Administration's tentative approval process and the global fight against HIV.
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Chahal HS, Murray JS, Shimer M, Capella P, Presto R, Valdez ML, and Lurie PG
- Subjects
- Global Health, Humans, International Cooperation, Tuberculosis, United States, United States Food and Drug Administration, World Health Organization, Anti-HIV Agents, Drug Approval, HIV Infections drug therapy
- Abstract
Introduction: In 2004, the US government began to utilize the Food and Drug Administration's (USFDA) tentative approval process (tFDA) as a basis to determine which HIV drugs are appropriate to be purchased and used in resource-constrained settings. This process permits products that are not approved for marketing in the US, including medicines with active patents or marketing restrictions in the US, to be purchased and distributed in resource-constrained settings. Although the tFDA was originally intended to support the United States' President's Emergency Plan for AIDS Relief (PEPFAR), the USFDA list has become a cornerstone of international HIV programmes that support procurement of ARVs, such as the World Health Organization and the Global Fund to Fight AIDS, Tuberculosis, and Malaria. Our objective in this article is to help the global HIV policy makers and implementers of HIV programmes better understand the benefits and limitations of the tFDA by providing an in-depth review of the relevant legal and regulatory processes., Discussion: USFDA's dedicated tFDA process for ARVs used by the PEPFAR programme has a wide impact globally; however, the implementation and the regulatory processes governing the programme have not been thoroughly described in the medical literature. This paper seeks to help stakeholders better understand the legal and regulatory aspects associated with review of ARVs under the tFDA by describing the following: (1) the tFDA and its importance to global ARV procurement; (2) the regulatory pathways for applications under tFDA for the PEPFAR programme, including modifications to applications, review timelines and costs; (3) the role of US patents, US marketing exclusivity rights, and the Medicines Patents Pool in tFDA; and (4) an overview of how applications for PEPFAR programme are processed through the USFDA. We also provide a case study of a new ARV, tenofovir alafenamide fumarate (TAF), not yet reviewed by USFDA for PEPFAR use., Conclusions: In this paper, we describe the importance and implementation of USFDA's tentative approval process to review ARVs for resource-constrained settings. We also highlight the impact of patents and exclusivities on review of HIV drugs under tFDA and illustrate the concepts using a new HIV drug as an example., (© 2017 The Authors. Journal of the International AIDS Society published by John Wiley & sons Ltd on behalf of the International AIDS Society.)
- Published
- 2017
- Full Text
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38. Association study of genetic variation in DNA repair pathway genes and risk of basal cell carcinoma.
- Author
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Lin Y, Chahal HS, Wu W, Cho HG, Ransohoff KJ, Song F, Tang JY, Sarin KY, and Han J
- Subjects
- Genome-Wide Association Study, Genotype, Humans, Polymorphism, Single Nucleotide, Carcinoma, Basal Cell genetics, DNA Repair genetics, Genetic Predisposition to Disease genetics, Skin Neoplasms genetics
- Abstract
DNA repair plays a critical role in protecting the genome from ultraviolet radiation and maintaining the genomic integrity of cells. Genetic variants in DNA repair-related genes can influence an individual's DNA repair capacity, which may be related to the risk of developing basal cell carcinoma (BCC). We comprehensively assessed the associations of 2,965 independent single-nucleotide polymorphisms (SNPs) across 165 DNA repair pathway genes with BCC risk in a genome-wide association meta-analysis totaling 17,187 BCC cases and 287,054 controls from two data sets. After multiple testing corrections, we identified three SNPs (rs2805831 upstream of XPA: OR = 0.93, P = 1.35 × 10
-6 ; rs659857 in exon of MUS81: OR = 1.06, P = 3.09 × 10-6 and rs57343616 in 3' UTR of NABP2: OR = 1.11, P = 6.47 × 10-6 ) as significantly associated with BCC risk in meta-analysis, and all of them were nominally significant in both data sets. Furthermore, rs659857 [T] was significantly associated with decreased expression of MUS81 mRNA in the expression quantitative trait locus (eQTL) analysis. Our findings suggest that the inherited common variation in three DNA repair genes-XPA, MUS81 and NABP2-may be involved in the development of BCC. To our knowledge, our study is the first report thoroughly examining the effects of SNPs across DNA repair pathway genes on BCC risk based on a genome-wide association meta-analysis., (© 2017 UICC.)- Published
- 2017
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- View/download PDF
39. Correlates of multiple basal cell carcinoma in a retrospective cohort study: Sex, histologic subtypes, and anatomic distribution.
- Author
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Kuo KY, Batra P, Cho HG, Li S, Chahal HS, Rieger KE, Tang JY, and Sarin KY
- Subjects
- Age Distribution, Aged, Aged, 80 and over, Carcinoma, Basal Cell therapy, Cohort Studies, Female, Hamartoma Syndrome, Multiple therapy, Humans, Immunohistochemistry, Incidence, Male, Middle Aged, Neoplasm Invasiveness pathology, Neoplasm Staging, Prognosis, Retrospective Studies, Sex Distribution, Skin Neoplasms therapy, Carcinoma, Basal Cell epidemiology, Carcinoma, Basal Cell pathology, Hamartoma Syndrome, Multiple epidemiology, Hamartoma Syndrome, Multiple pathology, Skin Neoplasms epidemiology, Skin Neoplasms pathology
- Published
- 2017
- Full Text
- View/download PDF
40. Chocolate intake and risk of clinically apparent atrial fibrillation: the Danish Diet, Cancer, and Health Study.
- Author
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Mostofsky E, Berg Johansen M, Tjønneland A, Chahal HS, Mittleman MA, and Overvad K
- Subjects
- Atrial Fibrillation etiology, Denmark epidemiology, Female, Humans, Incidence, Male, Middle Aged, Neoplasms, Prospective Studies, Risk Factors, Atrial Fibrillation epidemiology, Chocolate adverse effects, Diet, Feeding Behavior, Registries, Risk Assessment methods
- Abstract
Objective: To evaluate the association between chocolate intake and incident clinically apparent atrial fibrillation or flutter (AF)., Methods: The Danish Diet, Cancer, and Health Study is a large population-based prospective cohort study. The present study is based on 55 502 participants (26 400 men and 29 102 women) aged 50-64 years who had provided information on chocolate intake at baseline. Incident cases of AF were ascertained by linkage with nationwide registries., Results: During a median of 13.5 years there were 3346 cases of AF. Compared with chocolate intake less than once per month, the rate of AF was lower for people consuming 1-3 servings/month (hazard ratio (HR) 0.90, 95% confidence interval (CI) 0.82 to 0.98), 1 serving/week (HR 0.83, 95% CI 0.74 to 0.92), 2-6 servings/week (HR 0.80, 95% CI 0.71 to 0.91) and ≥1 servings/day (HR 0.84, 95% CI 0.65 to 1.09; p-linear trend <0.0001), with similar results for men and women., Conclusions: Accumulating evidence indicates that moderate chocolate intake may be inversely associated with AF risk, although residual confounding cannot be ruled out., Competing Interests: Competing interests: None declared., (Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/.)
- Published
- 2017
- Full Text
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41. Association between genetic variation within vitamin D receptor-DNA binding sites and risk of basal cell carcinoma.
- Author
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Lin Y, Chahal HS, Wu W, Cho HG, Ransohoff KJ, Dai H, Tang JY, Sarin KY, and Han J
- Subjects
- Adult, Aged, Binding Sites genetics, Carcinoma, Basal Cell epidemiology, Carcinoma, Basal Cell pathology, Genetic Predisposition to Disease, Genotype, Humans, Middle Aged, Polymorphism, Single Nucleotide, Receptors, Calcitriol metabolism, Skin Neoplasms epidemiology, Skin Neoplasms pathology, Vitamin D metabolism, Carcinoma, Basal Cell genetics, Genome-Wide Association Study, Receptors, Calcitriol genetics, Skin Neoplasms genetics
- Abstract
An increasing number of studies have reported a protective association between vitamin D and cancer risk. The vitamin D endocrine system regulates transcriptional programs involved in inflammation, cell growth and differentiation through the binding of vitamin D receptor (VDR) to specific VDR elements. However, limited attention has been given to the role of variation within VDR binding sites in the development of basal cell carcinoma (BCC). Across 2,776 previously identified VDR binding sites, we identified 2,540 independent single-nucleotide polymorphisms (SNPs) and examined their associations with BCC risk in a genome-wide association meta-analysis totaling 17,187 BCC cases and 287,054 controls from two data sets. After multiple testing corrections, we identified two SNPs at new loci (rs16917546 at 10q21.1: odds ratio (OR) = 1.06, p = 3.16 × 10
-7 and rs79824801 at 12q13.3: OR = 1.10, p = 1.88 × 10-5 ) for the first time as independently related to BCC risk in meta-analysis; and both SNPs were nominally significant in two data sets. In addition, the SNP rs3769823 within VDR binding site at a previously reported BCC susceptibility locus (2q33.1, rs13014235) also exhibited a significant association (OR = 1.12, p = 3.99 × 10-18 ). A mutually adjusted model suggested that rs3769823 explained the signal in this region. Our findings support the hypothesis that inherited common variation in VDR binding sites affects the development of BCC., (© 2017 UICC.)- Published
- 2017
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42. Orbital Mucormycosis Following Periorbital Cutaneous Infection.
- Author
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Chahal HS, Abgaryan N, Lakshminarayanan R, and Glover AT
- Subjects
- Antifungal Agents therapeutic use, Debridement methods, Eye Infections, Fungal diagnosis, Eye Infections, Fungal therapy, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Mucormycosis diagnosis, Mucormycosis therapy, Orbital Diseases diagnosis, Orbital Diseases therapy, Skin Diseases, Bacterial diagnosis, Skin Diseases, Bacterial therapy, Tomography, X-Ray Computed, Eye Infections, Fungal etiology, Mucormycosis etiology, Orbital Diseases etiology, Skin Diseases, Bacterial complications
- Abstract
Mucormycosis is an aggressive fungal infection characterized by rapidly progressive angioinvasion and tissue necrosis. When present in the orbit, mucormycosis can quickly lead to permanent visual loss and potentially fatal cerebral extension. Orbital involvement is almost universally preceded by infection of the paranasal sinuses. Secondary infection of the orbit via direct extension of neighboring cutaneous mucormycosis has not been previously described. The authors present a case of cutaneous mucormycosis with orbital extension in a poorly controlled diabetic patient.
- Published
- 2017
- Full Text
- View/download PDF
43. Risk Factors for Basal Cell Carcinoma Among Patients With Basal Cell Nevus Syndrome: Development of a Basal Cell Nevus Syndrome Patient Registry.
- Author
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Solis DC, Kwon GP, Ransohoff KJ, Li S, Chahal HS, Ally MS, Peters MAD, Schmitt-Burr K, Lindgren J, Bailey-Healy I, Teng JM, Epstein EH Jr, and Tang JY
- Abstract
Importance: Patients with basal cell nevus syndrome (BCNS) have a greater risk of developing numerous basal cell carcinomas (BCCs). Risk factors influencing the wide variation in tumor burden are poorly understood., Objective: To describe the burden of BCCs in patients with BCNS in the United States and identify potential risk factors for BCCs., Design, Setting, and Participants: Prospective clinical registry with data collected from September 2014 to March 2016. Participants were recruited from a mailing list of patients with BCNS at Children's Hospital Oakland Research Institute and Basal Cell Carcinoma Nevus Syndrome Life Support Network. Patients of all ages with a diagnosis of BCNS were eligible for enrollment. Participants completed a clinical questionnaire on their disease characteristics and risk factors., Main Outcomes and Measures: Number of BCCs in the past 2 years and over lifetime (disease burden), risk factors for BCCs., Results: A consecutive sample of the first 141 participants was included (34% [100 of 297] response rate from paper survey, 23% [41 of 179] from online survey; 85 [60%] female; mean age at start of study, 53 [range, 8-83] years; 131 [93%] white). In the previous 2 years, participants reported a mean of 25 BCCs (median, 11; range, 0-250). Over their lifetime, participants reported a mean of 257 BCCs (median, 160; range, 0-2200). Univariate analysis identified age (odds ratio [OR], 1.05; 95% CI, 1.03-1.07; P < .001), number of sunburns (OR, 1.05; 95% CI, 1.00-1.10; P = .047), and history of radiation exposure (OR, 2.26; 95% CI, 1.02-5.03; P = .046) as potential risk factors for lifetime BCC severity. On multivariate analysis, only age (OR, 1.04; 95% CI, 1.02-1.07; P < .001) and number of sunburns (OR, 1.06; 95% CI, 1.00-1.11; P = .04) were statistically significant. In our adjusted models, BCC burden increased by 4% per year of age and by 6% per number of sunburns., Conclusions and Relevance: Patients with BCNS have a high burden of BCCs. Age and number of sunburns were significantly associated with the severity of lifetime BCC. Further interventions to prevent and treat BCCs in patients with BCNS are needed.
- Published
- 2017
- Full Text
- View/download PDF
44. Incidence ratio of basal cell carcinoma to squamous cell carcinoma equalizes with age.
- Author
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Chahal HS, Rieger KE, and Sarin KY
- Subjects
- Adult, Age Factors, Female, Humans, Incidence, Male, Middle Aged, Retrospective Studies, Carcinoma, Basal Cell epidemiology, Carcinoma, Squamous Cell epidemiology, Skin Neoplasms epidemiology
- Published
- 2017
- Full Text
- View/download PDF
45. Combination Lateral Rotational and Glabellar Flaps for Medial Canthal Defects.
- Author
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Chahal HS and Allen RC
- Subjects
- Aged, Aged, 80 and over, Esthetics, Female, Humans, Male, Middle Aged, Mohs Surgery, Retrospective Studies, Treatment Outcome, Eyelids surgery, Plastic Surgery Procedures methods, Skin Neoplasms surgery, Surgical Flaps
- Published
- 2016
- Full Text
- View/download PDF
46. Genome-wide association study identifies 14 novel risk alleles associated with basal cell carcinoma.
- Author
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Chahal HS, Wu W, Ransohoff KJ, Yang L, Hedlin H, Desai M, Lin Y, Dai HJ, Qureshi AA, Li WQ, Kraft P, Hinds DA, Tang JY, Han J, and Sarin KY
- Subjects
- Adult, Alleles, Carcinoma, Basal Cell immunology, Carcinoma, Basal Cell pathology, Case-Control Studies, Disease Progression, Female, Genotype, Humans, Keratinocytes immunology, Keratinocytes metabolism, Male, Middle Aged, Quantitative Trait Loci, RNA, Untranslated genetics, Skin cytology, Skin pathology, Skin Neoplasms immunology, Skin Neoplasms pathology, Telomere Homeostasis genetics, Carcinoma, Basal Cell genetics, Genetic Predisposition to Disease, Genome-Wide Association Study, Skin Neoplasms genetics
- Abstract
Basal cell carcinoma (BCC) is the most common cancer worldwide with an annual incidence of 2.8 million cases in the United States alone. Previous studies have demonstrated an association between 21 distinct genetic loci and BCC risk. Here, we report the results of a two-stage genome-wide association study of BCC, totalling 17,187 cases and 287,054 controls. We confirm 17 previously reported loci and identify 14 new susceptibility loci reaching genome-wide significance (P<5 × 10(-8), logistic regression). These newly associated SNPs lie within predicted keratinocyte regulatory elements and in expression quantitative trait loci; furthermore, we identify candidate genes and non-coding RNAs involved in telomere maintenance, immune regulation and tumour progression, providing deeper insight into the pathogenesis of BCC.
- Published
- 2016
- Full Text
- View/download PDF
47. Genome-wide association study identifies novel susceptibility loci for cutaneous squamous cell carcinoma.
- Author
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Chahal HS, Lin Y, Ransohoff KJ, Hinds DA, Wu W, Dai HJ, Qureshi AA, Li WQ, Kraft P, Tang JY, Han J, and Sarin KY
- Subjects
- Adult, Aged, Carcinoma, Squamous Cell metabolism, Carcinoma, Squamous Cell pathology, Case-Control Studies, Chromosome Mapping, Female, Genome-Wide Association Study, Humans, Inheritance Patterns, Male, Middle Aged, Neoplasm Proteins metabolism, Skin Neoplasms metabolism, Skin Neoplasms pathology, Carcinoma, Squamous Cell genetics, Genetic Loci, Genetic Predisposition to Disease, Genome, Human, Neoplasm Proteins genetics, Skin Neoplasms genetics
- Abstract
Cutaneous squamous cell carcinoma represents the second most common cutaneous malignancy, affecting 7-11% of Caucasians in the United States. The genetic determinants of susceptibility to cutaneous squamous cell carcinoma remain largely unknown. Here we report the results of a two-stage genome-wide association study of cutaneous squamous cell carcinoma, totalling 7,404 cases and 292,076 controls. Eleven loci reached genome-wide significance (P<5 × 10(-8)) including seven previously confirmed pigmentation-related loci: MC1R, ASIP, TYR, SLC45A2, OCA2, IRF4 and BNC2. We identify an additional four susceptibility loci: 11q23.3 CADM1, a metastasis suppressor gene involved in modifying tumour interaction with cell-mediated immunity; 2p22.3; 7p21.1 AHR, the dioxin receptor involved in anti-apoptotic pathways and melanoma progression; and 9q34.3 SEC16A, a putative oncogene with roles in secretion and cellular proliferation. These susceptibility loci provide deeper insight into the pathogenesis of squamous cell carcinoma.
- Published
- 2016
- Full Text
- View/download PDF
48. Regionalization as an approach to regulatory systems strengthening: a case study in CARICOM member states.
- Author
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Preston C, Chahal HS, Porrás A, Cargill L, Hinds M, Olowokure B, Cummings R, and Hospedales J
- Subjects
- Biomedical Technology standards, Caribbean Region, Humans, West Indies, Biomedical Technology legislation & jurisprudence, Government Regulation, International Cooperation, Legislation, Drug standards
- Abstract
Improving basic capacities for regulation of medicines and health technologies through regulatory systems strengthening is particularly challenging in resource-constrained settings. "Regionalization"-an approach in which countries with common histories, cultural values, languages, and economic conditions work together to establish more efficient systems-may be one answer. This report describes the Caribbean Regulatory System (CRS), a regionalization initiative being implemented in the mostly small countries of the Caribbean Community and Common Market (CARICOM). This initiative is an innovative effort to strengthen regulatory systems in the Caribbean, where capacity is limited compared to other subregions of the Americas. The initiative's concept and design includes a number of features and steps intended to enhance sustainability in resource-constrained contexts. The latter include 1) leveraging existing platforms for centralized cooperation, governance, and infrastructure; 2) strengthening regulatory capacities with the largest potential public health impact; 3) incorporating policies that promote reliance on reference authorities; 4) changing the system to encourage industry to market their products in CARICOM (e.g., using a centralized portal of entry to reduce regulatory burdens); and 5) building human resource capacity. If implemented properly, the CRS will be self-sustaining through user fees. The experience and lessons learned thus far in implementing this initiative, described in this report, can serve as a case study for the development of similar regulatory strengthening initiatives in resource-constrained environments.
- Published
- 2016
49. PSD-95 regulates CRFR1 localization, trafficking and β-arrestin2 recruitment.
- Author
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Dunn HA, Chahal HS, Caetano FA, Holmes KD, Yuan GY, Parikh R, Heit B, and Ferguson SSG
- Subjects
- Animals, Cells, Cultured, Cyclic AMP metabolism, Disks Large Homolog 4 Protein, Endocytosis, Extracellular Signal-Regulated MAP Kinases metabolism, HEK293 Cells, Humans, Mice, Post-Synaptic Density metabolism, Protein Interaction Domains and Motifs, Protein Transport, Receptors, Corticotropin-Releasing Hormone chemistry, Signal Transduction, Guanylate Kinases metabolism, Membrane Proteins metabolism, Receptors, Corticotropin-Releasing Hormone metabolism, beta-Arrestin 2 metabolism
- Abstract
Corticotropin-releasing factor (CRF) is a neuropeptide commonly associated with the hypothalamic-pituitary adrenal axis stress response. Upon release, CRF activates two G protein-coupled receptors (GPCRs): CRF receptor 1 (CRFR1) and CRF receptor 2 (CRFR2). Although both receptors contribute to mood regulation, CRFR1 antagonists have demonstrated anxiolytic and antidepressant-like properties that may be exploited in the generation of new pharmacological interventions for mental illnesses. Previous studies have demonstrated CRFR1 capable of heterologously sensitizing serotonin 2A receptor (5-HT2AR) signaling: another GPCR implicated in psychiatric disease. Interestingly, this phenomenon was dependent on Postsynaptic density 95 (PSD-95)/Disc Large/Zona Occludens (PDZ) interactions on the distal carboxyl termini of both receptors. In the current study, we demonstrate that endogenous PSD-95 can be co-immunoprecipitated with CRFR1 from cortical brain homogenate, and this interaction appears to be primarily via the PDZ-binding motif. Additionally, PSD-95 colocalizes with CRFR1 within the dendritic projections of cultured mouse neurons in a PDZ-binding motif-dependent manner. In HEK 293 cells, PSD-95 overexpression inhibited CRFR1 endocytosis, whereas PSD-95 shRNA knockdown enhanced CRFR1 endocytosis. Although PSD-95 does not appear to play a significant role in CRF-mediated cAMP or ERK1/2 signaling, PSD-95 was demonstrated to suppress β-arrestin2 recruitment: providing a potential mechanism for PSD-95's inhibition of endocytosis. In revisiting previously documented heterologous sensitization, PSD-95 shRNA knockdown did not prevent CRFR1-mediated enhancement of 5-HT2AR signaling. In conclusion, we have identified and characterized a novel functional relationship between CRFR1 and PSD-95 that may have implications in the design of new treatment strategies for mental illness., (Copyright © 2016 Elsevier Inc. All rights reserved.)
- Published
- 2016
- Full Text
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50. Establishing a regulatory value chain model: An innovative approach to strengthening medicines regulatory systems in resource-constrained settings.
- Author
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Chahal HS, Kashfipour F, Susko M, Feachem NS, and Boyle C
- Subjects
- Clinical Trials as Topic standards, Developing Countries, Guidelines as Topic, Health Resources, Humans, Marketing of Health Services, Product Surveillance, Postmarketing, Public Health, Quality Control, Legislation, Drug, Public Health Administration
- Abstract
Medicines Regulatory Authorities (MRAs) are an essential part of national health systems and are charged with protecting and promoting public health through regulation of medicines. However, MRAs in resource-constrained settings often struggle to provide effective oversight of market entry and use of health commodities. This paper proposes a regulatory value chain model (RVCM) that policymakers and regulators can use as a conceptual framework to guide investments aimed at strengthening regulatory systems. The RVCM incorporates nine core functions of MRAs into five modules: (i) clear guidelines and requirements; (ii) control of clinical trials; (iii) market authorization of medical products; (iv) pre-market quality control; and (v) post-market activities. Application of the RVCM allows national stakeholders to identify and prioritize investments according to where they can add the most value to the regulatory process. Depending on the economy, capacity, and needs of a country, some functions can be elevated to a regional or supranational level, while others can be maintained at the national level. In contrast to a "one size fits all" approach to regulation in which each country manages the full regulatory process at the national level, the RVCM encourages leveraging the expertise and capabilities of other MRAs where shared processes strengthen regulation. This value chain approach provides a framework for policymakers to maximize investment impact while striving to reach the goal of safe, affordable, and rapidly accessible medicines for all.
- Published
- 2016
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