Search

Copyright of Saúde Coletiva is the property of MPM Comunicacao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Saúde Coletiva is the property of MPM Comunicacao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

OBJECTIVE: This article discusses how Pre-Exposure Prophylaxis (PrEP) and the undetectable viral load=untransmissible (UVL=U) have produced reconfigurations in the contexts of affective-sexual encounters of young gay men/men who have sex with men (MSM) living with HIV (YLHIV). METHODS: In-depth interviews were conducted with nine YLHIV, aged 18 to 29, from two studies conducted in Salvador, Bahia, in 2019 and 2021. The narratives focused on unprecedented events in the prevention and treatment of HIV/AIDS, which have allowed experiences of greater intimacy and safety but also challenges and tensions in affective-sexual relationships. RESULTS: Different moments in the experience of living with HIV reveal different narratives of YLHIV concerning the new PrEP and UVL biotechnologies. Concerns surrounding possible HIV transmission or the obligation to reveal serology are more prominent among young people with the most recent diagnosis. In contrast, those with more extended serology experience are more comfortable and confident in the face of new technologies and their significant effects on sexual encounters. However, controversies remain regarding the moral and behavioral consequences of their use. Some YLHIV re-update concerns and bring reports about the continuity of stigma toward people living with HIV. Others emphasize the benefits of biomedical advances, opening up new interactive possibilities, including without the use of condoms, highlighting the existence of other practices, knowledge, dynamics, and ways of negotiating risk/care, with tensions in the field of sexuality itself. CONCLUSIONS: We reiterate the need to resume public policies in the field of HIV/AIDS beyond biomedical strategies, highlighting vulnerabilities, the dissemination of information about new HIV prevention and treatment technologies, respect for people's autonomy in their preventive choices, and the development of strategies to combat the stigma associated with HIV/AIDS. [ABSTRACT FROM AUTHOR]

Evidences on the absence of risk of sexual transmission of HIV by persons living with HIV/AIDS (PLWHA) with undetectable plasma HIV-RNA (HIV-RNA <200 copies/ml) led to the worldwide campaign "U = U" (undetectable = untransmittable). The purpose of this study was to evaluate the perceived accuracy of this message among PLWHA, HIV-negative people having unprotected sex (PHUS) and infectious diseases' (ID) physicians in Italy. A nationwide survey has been conducted using three different anonymous questionnaires (for ID physicians, PLWHA and PHUS). A total of 1121 participants filled the questionnaires: 397 PLWHA; 90 physicians; 634 PHUS. Awareness of U = U message has been reported in 74%, 92% and 47% of PLWHA, ID physicians and PHUS, respectively. The perception of accuracy of the U = U message among those aware was reported as high in 80.4%, 79.5% and 67.3% of PLWHA, ID physicians and PHUS, respectively. Physicians perceived that 11% of PLWHA have a high rate of perception of U = U, whereas among PLWHA, only 34% reported definitive positive messages from physicians. Discrepancies between awareness and perception of accuracy of the message U = U in PLWHA and physicians have been found, suggesting still low confidence in the community regarding the message itself. [ABSTRACT FROM AUTHOR]

Background. The message of undetectable HIV viral load equals untransmissible (U=U) is important to reduce HIV stigma. We examined Australian general practitioner (GP)s' agreement of and discussion with clients about U=U. Methods. We conducted an online survey through GP networks from April to October 2022. All GPs working within Australia were eligible. Univariable and multivariable logistic regression analyses were performed to identify factors associated with: (1) agreement of U=U; and (2) discussing U=U with clients. Results. Of 703 surveys, 407 were included in the final analysis. Mean age was 39.7 years (s.d.: 8.4). Most GPs (74.2%, n = 302) agreed with U=U, but only 33.9% (n = 138) had ever discussed U=U with clients. Key barriers to discussing U=U were lack of relevant client presentations (48.7%), lack of understanding about U=U (39.9%), and difficulty identifying those who would benefit from U=U (6.6%). Agreement with U=U was associated with greater odds of discussing U=U (adjusted odds ratio (AOR) 4.75, 95% confidence interval (CI): 2.33-9.68), younger age (AOR 0.96 per additional year of age, 95%CI: 0.94-0.99), and extra training in sexual health (AOR 1.96, 95%CI: 1.11-3.45). Discussing U=U was associated with younger age (AOR 0.97, 95%CI: 0.94-1.00), extra training with sexual health (AOR 1.93, 95%CI: 1.17-3.17), and negatively associated with working in a metropolitan or suburban area (AOR 0.45, 95%CI: 0.24-0.86). Conclusion. Most GPs agreed with U=U, but most had not discussed U=U with their clients. Concerningly, one in four GPs were neutral or disagreed with U=U, suggesting that further qualitative research to understand this finding, and implementation research to promote U=U among Australian GPs, is urgently needed. [ABSTRACT FROM AUTHOR]

Background. Undetectable=Untransmittable (U=U) first emerged in 2016 as a health information campaign to promote rigorous scientific evidence that people living with HIV (PLHIV) on effective treatment who have reached an undetectable or suppressed viral load cannot pass on the virus sexually. Within 7 years, U=U underwent transformation from a global community-led, grassroots movement into a global HIV/AIDS health equity strategy and policy priority. Methods. For this narrative review, a targeted literature search on 'history' + 'Undetectable=Untransmittable' and/or 'U=U' on Google and Google Scholar, in addition to a search of online documents on the Prevention Access Campaign (PAC) website, was conducted. The article utilises an interdisciplinary policy studies approach that recognises the roles of multi-stakeholder, especially that of the community and civil society, to effect policy change. Results. The narrative review first provides a synopsis of the scientific origination of U=U. The second section highlights the progress and leadership on U=U led by the PAC and civil society partners and efforts of the PLHIV and ally communities in advocating for the broad recognition and dissemination of the evidence, which has proven to be a game-changer within the HIV/AIDS response. The third section spotlights the recent developments of U=U within the local, national, and multilateral spheres. Conclusion. The article ends with recommendations for community and HIV/AIDS multi-stakeholders on how they can further integrate, implement, and strategically utiliseU=U as an essential and complementary HIV/AIDS pillar to the current Global AIDS Strategy 2021-2026 to end inequalities to end AIDS by 2030. [ABSTRACT FROM AUTHOR]

HIV disclosure to sexual partners remains a multifaceted yet stigmatised process. The 'undetectable equals untransmittable' (U = U) concept has raised ethical and moral concerns about the obligation and need to disclose, and using Internet applications to seek sex partners has modified disclosure practices. While previous qualitative literature has examined the HIV disclosure process, there is a dearth of information on this topic among gay men in the USA who have an undetectable viral load. Using thematic analysis of data collected during a period of expanded U = U knowledge, this study explores the cognitive, contextual, interpersonal and structural factors impacting undetectable gay men's HIV status disclosure decisions to sexual partners. In-depth interviews were conducted in August 2020 over Zoom with 20 gay men with undetectable viral loads. The main themes included 'sense of obligation,' 'situational disclosure' and 'partners' responsibility in the disclosure process.' Participants balanced the aforementioned factors to inform their disclosure decisions, and disclosure patterns varied across participants dependent upon thoughts regarding ethics and morality of (non-)disclosure. The findings provide new insights to how participants navigate disclosure while considering U = U, HIV criminalisation laws, and finding partners through Internet applications while providing direction for future studies and support for decriminalising HIV and expanding HIV education. [ABSTRACT FROM AUTHOR]

Copyright of Sexualidad, Salud y Sociedad: Revista Latinoamericana is the property of Editora da Universidade do Estado do Rio de Janeiro (EdUERJ) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

HIV/AIDS has a strong impact on society, the economy, and health. Early diagnosis of cases, adherence to treatment, and prevention are important factors in controlling the epidemic in the population. In this paper, we present a new mathematical model for the study of HIV/AIDS transmission. Our model is stratified in men and women, to account for the main forms of sexual transmission homosexual and heterosexual relationships, and infectiousness in the HIV and AIDS stages. In addition, in the construction of the model, we take into account the influence of Pre-Exposure Prophylaxis (PrEP) and Post-Exposure Prophylaxis (PEP) to study the impact of these implementations, diagnosis, and effectiveness of treatment based on viral load undetectability. We study the basic reproduction number by subpopulation (men and women) and general. Working by subpopulations allows us to study men who have sex with men who have a strong impact on virus transmission. Also, we study the infection-free equilibrium points due to their relationship with the basic reproduction number and demonstrate the global stability by subpopulation and general. To explore our model, we performed computational simulations on a scenario designed with data from the literature and assumed, studying the influence of the parameters associated with the use of PrEP, PEP, and undetectability on the basic reproduction number by varying them individually and jointly. We concluded that in women the basic reproduction number is always lower than unity and that in men the parameter associated with the undetectability of the viral load in HIV men has a strong influence on the dynamics. We also address the impact of PrEP, PEP, and undetectability in HIV and AIDS on the compartments, considering different scenarios varying the parameters jointly and independently and by sex which show difficulty in reducing women with AIDS. The scenario that showed the best results in the reduction of the number of HIV and AIDS cases was when the parameters associated with undetectability in HIV and AIDS men and women take the 90-90-90 that is proposed in the World Health Organization (WHO) strategy.

This study aimed to retrospectively analyze the features of contrast-enhanced ultrasound (CEUS) of renal masses that cannot be detected by conventional ultrasound (CUS). The data of 264 patients who underwent CEUS for renal lesions from January 2016 to December 2019 were retrieved. Of these, 16 patients with renal masses which were not detected by CUS were included in the final analysis. The corresponding characteristics of CEUS were evaluated, including intensity of enhancement, homogeneity, wash-in and wash-out patterns, and perilesional rim-like enhancement. Of the 16 patients, 10 patients had clear cell renal cell carcinoma (ccRCC) and 6 patients had urothelial carcinoma of the renal pelvis (UCRP). Compared with the location on non-enhanced computed tomography (CT) scan, all tumors were detected on CEUS. Most (7/10) of the ccRCCs appeared as hyperenhancement, homogeneous enhancement, synchronous-in, and no perilesional rim-like enhancement. Most (4/6) of the UCRPs appeared as isoenhancement, slow-in, fast-out, and no perilesional rim-like enhancement. CEUS may be helpful in the diagnosis and differential diagnosis of renal tumors which were not observed on CUS, and it might be an alternative method for some patients when contrast-enhanced computed tomography (CECT) or magnetic resonance imaging (MRI) cannot be performed.

Suppressing HIV viral loads to undetectable levels is essential for ending the HIV/AIDS epidemic. We evaluated randomized controlled trials aimed to increase antiretroviral medication adherence and promote undetectable viral loads among people living with HIV through November 22, 2019. We extracted data from 51 eligible interventions and analyzed the results using random effects models to compare intervention effects between groups within each intervention and across interventions. We also evaluated the relation between publication date and treatment effects. Only five interventions increased undetectable viral loads significantly. As a whole, the analyzed interventions were superior to Standard of Care in promoting undetectable viral loads. Interventions published more recently were not more effective in promoting undetectable viral loads. No treatment category consistently produced significant increases in undetectable viral loads. To end the HIV/AIDS epidemic, we should use interventions that can suppress HIV viral loads to undetectable levels. [ABSTRACT FROM AUTHOR]

Daily antiretroviral therapy (ART) suppresses viral replication, rendering HIV undetectable through viral load (VL) testing. People living with HIV (PLWH) who have an undetectable VL cannot transmit HIV to sexual partners or through giving birth, a message commonly referred to as U = U (undetectable equals untransmittable). To increase knowledge and understanding of U = U among men, who have poorer HIV testing and treatment outcomes than women, we engaged men from high HIV burden communities in Cape Town in two interactive human-centered design cocreation workshops to develop local U = U messaging for men. Two trained workshop facilitators, explained the U = U message to 39 adult men (in two separate workshops), and asked them how to effectively communicate U = U to other men in the local language (isiXhosa). Participant-designed messages sought to inform men about U = U to help assuage fears of testing HIV positive (by removing the stigma of living with HIV and being a vector of disease), and to explain that ART enables PLWH to live normal healthy lives, making HIV "untransmittable" to sex partners. Participants' messages emphasized that when virally suppressed, "I cannot spread HIV to the other person" and "(the pill) keeps on killing the virus so I can live a normal life for the rest of my life." Men cocreated simple local U = U messages to address fears of testing HIV positive and emphasizing ART's positive effects. Cocreated tailored messaging may reduce stigma associated with living with HIV and improve the uptake of HIV testing and treatment among South African men. This study was registered at clinicaltrials.gov under NCT04364165. [ABSTRACT FROM AUTHOR]

The everyday meaning and use of HIV 'undetectability' raises significant questions about the social and sexual significance of this state of viral suppression. We conducted in-depth, semi-structured interviews with 25 sexual minority men living in Vancouver, Canada, including men living with HIV. Interviews were audio-recorded, transcribed verbatim and analysed using grounded theory. Most participants understood being undetectable to signify that someone living with HIV is at a 'low,' 'lower,' or 'slim to no' risk of sexually transmitting HIV, as opposed to meaning 'uninfectious' or 'untransmittable'. Men discussed how undetectability was communicated in-person and online, including via sexual networking apps, and revealed how it is sometimes confused or conflated with another biomedical advance in HIV-prevention, namely pre-exposure prophylaxis (PrEP). HIV-negative men expressed significant scientific scepticism, a reluctance to incorporate a partner's low viral load or undetectable HIV status into their sexual decision-making, and an enduring fear associated with knowingly having sex with someone who is HIV-positive. We describe this as a form of untransmittable scepticism. While international campaigns have worked to communicate the scientific message that 'undetectable equals untransmittable' (U = U), the sexual stigma attached to HIV remains durable among some gay, bisexual, queer and other men who have sex with men. [ABSTRACT FROM AUTHOR]

We examined temporal trends and factors associated with reporting partner's serostatus and viral load among a sample of gay, bisexual and other men who have sex with men (gbMSM) in Vancouver, Canada. Participants were recruited using respondent-driven sampling and we collected prospective cohort data from 09/2014 to 02/2017 using a computer-assisted questionnaire and nurse-administered STI/HIV testing. Our study included 481 participants reporting on 3780 sexual events. Among HIV-negative/unknown gbMSM we found a trend towards decreased proportions of sexual events reporting an unknown HIV-status partner (42–19%; p = < 0.001) and found increased proportions among gbMSM living with HIV (11–27%; p = 0.043). More participants living with HIV reported sex with undetectable partners, compared to HIV-negative/unknown participants (14.8% versus 5%). Our multivariable model found that compared with unknown status partners, undetectable partners were older, were from longer sexual relationships and were more likely to engage in condomless anal sex. Findings indicate that HIV-negative gbMSM seem more aware of the serostatus of their partners over time, but knowledge of partners' viral load over time was not significant. Further research should assess the degree to which new campaigns such as Undetectable = Untransmittable (U = U) are associated with discussions about HIV disclosure and viral load status. [ABSTRACT FROM AUTHOR]

In recent years, the ‘end of AIDS’ has been at the top of the international scientific and political agenda. At the same time, attention to the dark years of the epidemic is increasing, revealing a form of nostalgia for a time of collective mobilization. But what is to be said of the current state of the disease, between the nostalgia for a tragic past and the hope of a world without AIDS? This think piece was prompted by the increasing erasure of contemporary experiences of the sickness. At a time when we have the means to render HIV biologically undetectable, I propose to explore another of the virus’s materialities: its social and historic inscription in urban settings, in particularly in Montreal’s gay neighbourhood.

There are a number of measures that are available to reduce the sexual transmission and acquisition of the human immunodeficiency virus (HIV). These include: antiretroviral (ARV) therapy in those living with HIV to achieve an undetectable viral load, which eliminates the sexual transmission of HIV, and is a concept known as 'Undetectable = Untransmittable' ('U=U'); Pre-Exposure Prophylaxis (PrEP) and Post-Exposure Prophylaxis (PEP) to HIV, which provide protection against the sexual acquisition of HIV; and advice for HIV-negative women who wish to conceive with a male partner living with HIV. [ABSTRACT FROM AUTHOR]

It is now established that people living with HIV who have an undetectable viral load and adhere to antiretroviral treatment cannot transmit HIV to their sexual partners. Previous research has shown that 'being undetectable' changes how HIV‐positive gay men experience their sex lives. But how does it affect gay men's reproductive behaviours? And what influence does it have on views about parenthood at a time when gay fatherhood has become more socially accepted and publicly visible? Drawing on qualitative interviews with patients and clinicians at four HIV clinics in London, we identify differences in how interviewees talked about the possibility of having children for HIV‐positive men. Both groups, unprompted, frequently referred to sperm washing as a method enabling safe conception. However, whereas clinicians talked about sperm washing as an historical technique, which is no longer necessary, patients spoke of it as a current tool. The men rarely mentioned being undetectable as relevant to parenthood and, when prompted, some said that they did not fully understand the mechanics of HIV transmission. Our findings offer new insights into how biomedical knowledge is incorporated into people's understandings of living with HIV, raising important questions about how the meanings of being undetectable are communicated. [ABSTRACT FROM AUTHOR]

Copyright of AIDS & Behavior is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Background Studies have demonstrated that persons with HIV (PWH) maintaining viral suppression do not transmit HIV to HIV-negative partners through condomless sex, leading to the "Undetectable = Untransmittable (U = U)" prevention campaign. However, few studies have examined the durability of suppression in the era of U = U. Methods This retrospective cohort study was conducted in Providence, Rhode Island. PWH aged ≥18 years with documented viral suppression (defined as at least 1 viral load [VL] <200 copies/mL and no VL ≥200 copies/mL) in 2015 were included in the baseline cohort. Primary outcomes were viral suppression, viral rebound (at least 1 VL ≥200 copies/mL), or gap in VL monitoring assessed annually from 2016 to 2019. Those with viral rebound were assessed for resuppression within 6 months. Demographic and clinical characteristics associated with viral rebound or gaps in VL monitoring were investigated by bivariate analysis and logistic regression. Results A total of 1242 patients with viral suppression were included in the baseline cohort. In each follow-up year, 85%–90% maintained viral suppression, 2%–5% experienced viral rebound, and 8%–10% had a gap in VL monitoring. Among those with viral rebound, approximately one-half were suppressed again within 6 months. In the logistic regression models, retention in care was significantly associated with viral suppression, while younger age, black race, high school or equivalent education, non–men who have sex with men, and history of incarceration were significantly associated with viral rebound. Conclusions In the U = U era, most patients with viral suppression who are retained in care are likely to maintain viral suppression over time. Some patients require additional support for regular VL monitoring. [ABSTRACT FROM AUTHOR]

Background: Hepatitis B virus (HBV) causes significant morbidity and mortality globally primarily due to its ability to cause hepatitis, liver cirrhosis and hepatocellular carcinoma. The Kenya National Blood Transfusion Services screens for Hepatitis B antibodies using the chemiluminescent microparticle immunoassay method. This test does not inform on the genotypic characteristics of the virus or the actual presence of the virus in blood. This study therefore sought to determine the serologic and genotypic profiles of HBV circulating among the voluntary blood donors in Nairobi. Methods: Blood samples were collected in plain and EDTA vacutainers and tested for the Hepatitis B surface antigen (HBsAg). HBV DNA was then extracted from plasma, its overlapping P/S gene amplified and sequenced. The resulting sequences were used to analyze for the circulating genotypes and mutations within the P and S genes. Bivariate statistical analysis was used to determine the association between demographic factors and HBV infection. Results: A seroprevalence of 2.3% (n = 7) was reported. The age group 19–28 years was significantly associated with HBV infection. Nine samples were positive for HBV DNA; these included 2 HBsAg positive samples and 7 HBsAg negative samples. Genotype A, sub genotype A1 was found to be exclusively prevalent while a number of mutations were reported in the "a" determinant segment of the major hydrophilic region of the S gene associated with antibody escape. RT mutations including mutation rt181T in the P gene conferring resistance against Lamivudine and other ʟ-nucleoside drugs were detected. Conclusion: There is a high prevalence of occult HBV infections among these blood donors and therefore the testing platform currently in use requires revision. [ABSTRACT FROM AUTHOR]

Objective: To identify factors associated with the time to viral suppression in women starting antiretroviral treatment (ART) during pregnancy. Knowledge on duration of viral load (VL) decline could help deciding the timing of treatment initiation. Methods: Highly active antiretroviral treatment (HAART)-naive pregnant women over 18 years of age who started treatment during pregnancy were included. The time to viral suppression was calculated and compared between subgroups. Results: A total of 227 pregnancies matched our inclusion criteria. In 84.6% of these an undetectable VL was reached at the time of delivery. The median time to undetectable VL after initiation of treatment was 60 days (12–168 days). Only baseline VL

Suppressing HIV viral load through daily antiretroviral therapy (ART) substantially reduces the risk of HIV transmission, however, the potential population impact of treatment as prevention (TasP) is mitigated due to challenges with sustained care engagement and ART adherence. For an undetectable viral load (VL) to inform decision making about transmission risk, individuals must be able to accurately classify their VL as detectable or undetectable. Participants were 205 HIV-infected young men who have sex with men (YMSM) and transgender women (TGW) from a large cohort study in the Chicago area. Analyses examined correspondence among self-reported undetectable VL, study-specific VL, and most recent medical record VL. Among HIV-positive YMSM/TGW, 54% had an undetectable VL (< 200 copies/mL) via study-specific laboratory testing. Concordance between self-report and medical record VL values was 80% and between self-report and study-specific laboratory testing was 73%; 34% of participants with a detectable study-specific VL self-reported an undetectable VL at last medical visit, and another 28% reported not knowing their VL status. Periods of lapsed viral suppression between medical visits may represent a particular risk for the TasP strategy among YMSM/TGW. Strategies for frequent viral load monitoring, that are not burdensome to patients, may be necessary to optimize TasP. [ABSTRACT FROM AUTHOR]

Background and Aim: The aim of this study is to explore the value of volume navigation image fusion-assisted contrast-enhanced ultrasound (CEUS) in detection for radiofrequency ablation guidance of hepatocellular carcinomas (HCCs), which were undetectable on conventional ultrasound. Methods: From May 2012 to May 2014, 41 patients with 49 HCCs were included in this study. All lesions were detected by dynamic magnetic resonance imaging (MRI) and planned for radiofrequency ablation but were undetectable on conventional ultrasound. After a bolus injection of 2.4 ml SonoVue® (Bracco, Italy), LOGIQ E9 ultrasound system with volume navigation system (version R1.0.5, GE Healthcare, Milwaukee, WI, USA) was used to fuse CEUS and MRI images. The fusion time, fusion success rate, lesion enhancement pattern, and detection rate were analyzed. Results: Image fusions were conducted successfully in 49 HCCs, the technical success rate was 100%. The average fusion time was (9.2 ± 2.1) min (6-12 min). The mean diameter of HCCs was 25.2 ± 5.3 mm (mean ± SD), and mean depth was 41.8 ± 17.2 mm. The detection rate of HCCs using CEUS/MRI imaging fusion (95.9%, 47/49) was significantly higher than CEUS (42.9%, 21/49) ( P < 0.05). For small HCCs (diameter, 1-2 cm), the detection rate using imaging fusion (96.9%, 32/33) was also significantly higher than CEUS (18.2%, 6/33) ( P < 0.01). All HCCs displayed a rapid wash-in pattern in the arterial phase of CEUS. Conclusions: Imaging fusion combining CEUS and MRI is a promising technique to improve the detection, precise localization, and accurate diagnosis of undetectable HCCs on conventional ultrasound, especially small and atypical HCCs. [ABSTRACT FROM AUTHOR]

Purpose: The aim was to eliminate, by DNA comparison, any identity mismatch between operative and biopsy specimens and to analyse the determinants of all pT0 prostate cancers occurred in a single institution. Methods: All prostate pT0 cases in a single institution over 20 years were investigated. None of the patients had been diagnosed after a transurethral resection of the prostate nor had they received neoadjuvant hormonal treatment. The biopsies performed in other centres had been referred for a centralized pathologic re-analysis. DNA analysis was performed in samples from operative and biopsy specimens, and pairs of tissues were blindly constituted. Correct matching was verified in each pair and compared to the original database in order to comment on the occurrence of identity mismatches in the series. Results: Nineteen patients (0.77 %) had been diagnosed as having pT0 prostate cancer among the 2,462 RP procedures performed over 19 years. The biopsy re-analysis invalidated the initial diagnosis of prostate cancer in one biopsy set performed elsewhere. Among 12 entirely processed cases, the biochemistry procedure evaluated as 'very unlikely' the occurrence of an error in tissue identification in the biopsy setting, during the surgical procedure or the pathological analysis. No identification error of tissue samples was established in this first verified pT0 series. Conclusions: Although it must be suspected, specimen identification error was not a cause for pT0 prostate cancer. Only after a full pathological and DNA verification, the pT0 stage remains a sole entity, unexplained in most cases. [ABSTRACT FROM AUTHOR]

ABSTRACT In this paper, we propose a novel distributed covert channel in HTTP. Different from traditional covert channels in HTTP, the channel deploys multiple HTTP clients to dilute steganographic features. In a proper multiple-to-multiple transmission model based on the modulation of URLs, the channel is efficient and reliable. With a Poisson request generator, simulating behaviors of normal HTTP visitors, the covert traffic has a legitimate HTTP appearance that helps it be undetectable. The transmission experiments prove that the channel is error free and has a high transmission rate. The results of the undetectability experiment show that the channel is adjustable. By adjusting a certain parameter, the channel can trade off two different features, the transmission rate and the undetectability, which can meet different demands in practical applications. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Basic aspects in the handling of fatty acid-data have remained largely underexposed. Of these, we aimed to address three statistical methodological issues, by quantitatively exemplifying their imminent confounding impact on analytical outcomes: (1) presenting results as relative percentages or absolute concentrations, (2) handling of missing/non-detectable values, and (3) using structural indices for data-reduction. Therefore, we reanalyzed an example dataset containing erythrocyte fatty acid-concentrations of 137 recurrently depressed patients and 73 controls. First, correlations between data presented as percentages and concentrations varied for different fatty acids, depending on their correlation with the total fatty acid-concentration. Second, multiple imputation of non-detects resulted in differences in significance compared to zero-substitution or omission of non-detects. Third, patients' chain length-, unsaturation-, and peroxidation-indices were significantly lower compared to controls, which corresponded with patterns interpreted from individual fatty acid tests. In conclusion, results from our example dataset show that statistical methodological choices can have a significant influence on outcomes of fatty acid analysis, which emphasizes the relevance of: (1) hypothesis-based fatty acid-presentation (percentages or concentrations), (2) multiple imputation, preventing bias introduced by non-detects; and (3) the possibility of using (structural) indices, to delineate fatty acid-patterns thereby preventing multiple testing. [ABSTRACT FROM AUTHOR]

The article attempts to define the risks for genital HIV-1 RNA shedding in women with low/undetectable plasma virus. It examines cervical shedding of HIV-1 RNA among women with low levels of viremia while receiving highly active antiretroviral therapy. The article determines the relative effects of antiretroviral protease inhibitors versus nonnucleoside reverse transcriptase inhibitors on viral RNA shedding.

Steganography is a technique applied to ensure secure communication. It is challenged by visual observation or statistical analysis to ascertain whether a message is hidden within a cover medium. Several steganographic methods have been proposed for palette-based images. These methods maintain image quality but cannot resist some statistical and visual attacks. To overcome this problem, two parity assignments with performances similar to those of existing parity assignments are proposed. An innovative embedding process that randomly selects one parity assignment while embedding secret bits in each pixel is provided. Finally, a steganographic method using the proposed embedding process and a specified adaptive scheme is presented. Experimental results revealed that the proposed method is undetectable under some statistical and visual attacks even as it maintains image quality. [ABSTRACT FROM AUTHOR]