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Background: Tenosynovial giant cell tumor (TGCT) is a rare, locally aggressive tumor of the joints, bursa, and tendon sheath that can cause considerable pain and substantial morbidity. Although surgery is the primary treatment for patients with TGCT, surgical resection is associated with high rates of recurrence, particularly for patients with diffuse TGCT. Pexidartinib, a colony-stimulating factor 1 receptor inhibitor, is approved by the US Food and Drug Administration for the treatment of adult patients with symptomatic TGCT associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Case Description: A 32-year-old man presented with intra-articular diffuse TGCT with pain and received noncurative treatment for 5 years (2014–2019). In 2019, the patient was found to have extensive disease accompanied by pain and limited range of motion. The patient's case was presented to a sarcoma multidisciplinary tumor board, who determined that surgery would cause significant morbidity and macroscopic residual tumor. As a result of the extent of disease, young age, and otherwise good health, treatment with pexidartinib was started through a compassionate use program at 800 mg/day. After dose reductions to pexidartinib at 400 mg/day and then 200 mg/day as a result of creatine phosphokinase elevations, the patient achieved a complete response after 2 years of treatment; pain was reduced and mobility was restored. The patient reported no side effects related to pexidartinib treatment. Treatment was stopped in 2022 for future family planning. After pexidartinib therapy was interrupted, the patient's wife had a successful pregnancy and delivery; however, the disease showed a slow but constant clinical deterioration, with a reduction in the range of movement of the affected knee and an apparent increase in widespread TGCT nodules. Conclusion: Our case is unique because it provides support for pexidartinib use as upfront therapy for TGCT, instead of surgery, in selected cases. [ABSTRACT FROM AUTHOR]

Abstract Background Tenosynovial giant cell tumor (TGCT) is a rare, locally aggressive tumor of the joints, bursa, and tendon sheath that can cause considerable pain and substantial morbidity. Although surgery is the primary treatment for patients with TGCT, surgical resection is associated with high rates of recurrence, particularly for patients with diffuse TGCT. Pexidartinib, a colony-stimulating factor 1 receptor inhibitor, is approved by the US Food and Drug Administration for the treatment of adult patients with symptomatic TGCT associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Case Description A 32-year-old man presented with intra-articular diffuse TGCT with pain and received noncurative treatment for 5 years (2014–2019). In 2019, the patient was found to have extensive disease accompanied by pain and limited range of motion. The patient’s case was presented to a sarcoma multidisciplinary tumor board, who determined that surgery would cause significant morbidity and macroscopic residual tumor. As a result of the extent of disease, young age, and otherwise good health, treatment with pexidartinib was started through a compassionate use program at 800 mg/day. After dose reductions to pexidartinib at 400 mg/day and then 200 mg/day as a result of creatine phosphokinase elevations, the patient achieved a complete response after 2 years of treatment; pain was reduced and mobility was restored. The patient reported no side effects related to pexidartinib treatment. Treatment was stopped in 2022 for future family planning. After pexidartinib therapy was interrupted, the patient’s wife had a successful pregnancy and delivery; however, the disease showed a slow but constant clinical deterioration, with a reduction in the range of movement of the affected knee and an apparent increase in widespread TGCT nodules. Conclusion Our case is unique because it provides support for pexidartinib use as upfront therapy for TGCT, instead of surgery, in selected cases.

Diffuse-type tenosynovial giant cell tumors' (D-TGCTs) intra- and extra-articular expansion about the knee often necessitates an anterior and posterior surgical approach to facilitate an extensive synovectomy. There is no consensus on whether two-sided synovectomies should be performed in one or two stages. This retrospective study included 191 D-TGCT patients from nine sarcoma centers worldwide to compare the postoperative short-term outcomes between both treatments. Secondary outcomes were rates of radiological progression and subsequent treatments. Between 2000 and 2020, 117 patients underwent one-stage and 74 patients underwent two-stage synovectomies. The maximum range of motion achieved within one year postoperatively was similar (flexion 123-120°, p = 0.109; extension 0°, p = 0.093). Patients undergoing two-stage synovectomies stayed longer in the hospital (6 vs. 4 days, p < 0.0001). Complications occurred more often after two-stage synovectomies, although this was not statistically different (36% vs. 24%, p = 0.095). Patients treated with two-stage synovectomies exhibited more radiological progression and required subsequent treatments more often than patients treated with one-stage synovectomies (52% vs. 37%, p = 0.036) (54% vs. 34%, p = 0.007). In conclusion, D-TGCT of the knee requiring two-side synovectomies should be treated by one-stage synovectomies if feasible, since patients achieve a similar range of motion, do not have more complications, but stay for a shorter time in the hospital.

Aim: Real-world treatment patterns in tenosynovial giant cell tumor (TGCT) patients remain unknown. Pexidartinib is the only US FDA-approved treatment for TGCT associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Objective: To characterize drug utilization and treatment patterns in TGCT patients. Methods: In a retrospective observational study using IQVIA's linked prescription and medical claims databases (2018–2021), TGCT patients were stratified by their earliest systemic therapy claim (pexidartinib [N = 82] or non-FDA-approved systemic therapy [N = 263]). Results: TGCT patients treated with pexidartinib versus non-FDA-approved systemic therapies were predominantly female (61 vs 50.6%) and their median age was 47 and 54 years, respectively. Pexidartinib-treated patients had the highest 12-month probability of remaining on treatment (54%); 34.1% of pexidartinib users had dose reduction after their first claim. Conclusion: This study provides new insights into the unmet need, utilization and treatment patterns of systemic therapies for the treatment of TGCT patients. Plain language summary Treatment patterns in patients with tenosynovial giant cell tumors in the USA This database study is the first investigation of how drugs are used to treat patients with tenosynovial giant cell tumor (TGCT) in the real world. We researched adult TGCT patients from IQVIA's prescription and medical claims databases who started treatment with pexidartinib (N = 82) or other non-US FDA-approved systemic therapies (N = 263). The patients included in this analysis were mostly women (61.0 and 50.6%) and their median age was 47 and 54 years for pexidartinib and other non-FDA-approved systemic therapies, respectively. The patients treated with pexidartinib were most likely to remain on treatment (54.0%) at the end of the first year. Most patients (79.3%) started pexidartinib treatment at a total daily dose of 800 mg/day, as per the product label. Only 34.1% of patients had reduced medication dose during follow-up. Of note, this study found that TGCT patients were treated with other systemic therapies which remain unproven to be safe and effective in medical studies of TGCT. Given the unmet need, and with pexidartinib being the only approved systemic treatment in USA, there is an opportunity for the larger population of adult TGCT patients to benefit from its use. Further research is needed to identify barriers for access to pexidartinib and treatment of TGCT patients. Summary points Tenosynovial giant cell tumor (TGCT) is a rare, locally aggressive neoplasm affecting the synovial membrane lining joints, bursae and tendon sheaths. Pexidartinib is currently the only systemic treatment approved by the US FDA for the treatment of adult patients with symptomatic TGCT associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Other systemic therapies have been investigated in clinical studies of TGCT patients, none of them have been approved by the FDA for the treatment of TGCT specifically. Using a real-world claims database, this study characterized TGCT patients newly treated with pexidartinib or other unapproved systemic treatments and described their treatment patterns, including treatment duration and dosing. In this study, we found that although the median duration of pexidartinib treatment was not reached, patients on pexidartinib had the highest 12-month probability of remaining on treatment. Dose reductions after the first medication claim were commonly observed in the pexidartinib cohort (34.1%) and some patients (9.8%) had evidence of dose increase. Dose levels of the non-FDA-approved systemic therapies were consistent with the recommended dosages for other indications, as per their label, none of which were TGCT. As expected, 63.6–82.9% of TGCT patients treated with non-FDA-approved systemic therapies discontinued treatment at 12 months. This study provided novel insights into how systemic therapies for TGCT are used in real-world clinical practice, where surgery has been the standard of care. Given the large unmet need for the treatment of TGCT patients, and as pexidartinib is the only regulatory-approved systemic treatment, there is opportunity for its wider use in this patient population. [ABSTRACT FROM AUTHOR]

Introduction: Testicular cancer is the most common malignancy among men in the 20-44 age group. Most of the incidence is testicular germ cell tumor. In recent years there has been a steady increase in the incidence of this cancer. For this reason, we analyzed available articles on environmental risk factors that may influence the incidence of increased testicular malignancies Material and methods: Review of the specialized literature in the field of urology and articles available on PubMed, searching by the keywords “testicular cancer,” “testicular cancer risk factors,” “germ cell tumor,” “tgct‘’ Aim of the study: The purpose of the study is to review the available literature and research papers regarding risk factors for malignant tumors of the testis. Summary: In recent years, there has been an increase in the incidence of testicular cancer, especially among men aged 20-44 years. The vast majority of it is germ cell tumors (TGCT). This article discusses the influence of environmental factors on the development of testicular cancer, with particular emphasis on the induction of TGCT. Studies indicate an association between exposure to trichloroethylene and other solvents and the risk of TGCT induction. The role of exposure to pesticides (especially fungicides), organic chlorine compounds, and viruses was also indicated to increase the risk of developing TGCTs,. The association of neoplasia with marijuana and tobacco use has also been studied, but needs further research. There is a need for continued research regarding heavy metals, infertility and factors related to pregnancy and the perinatal period. It is necessary to know the mechanisms that induce the process of carcinogenesis in the testis, which will enable the use of prevention and prophylaxis.

Abstract We aimed to find new therapeutic targets related to Cancer Stem Cell alterations in recurrent patients from two TCGA cohorts: Testicular Germ Cell Tumor (TGCT) and Uterine Corpus Endometrial Carcinoma (UCEC). Raw sequencing data were downloaded from the TCGA database. Datasets containing RNA expression and Methylation files were directly downloaded from cBioportal. Variant Call Format files (VCFs) were downloaded from the GDC portal. Gene enrichment analysis was performed using GSEA (Gene Set Enrichment Analysis) software. Transcriptome profiling, coexpression co-occurrence, networks, and survival analyses were performed using cBioportal tools, while mutational analysis of patients was processed using UNIX scripts. We found that cancer stem cell transcription factors were highly expressed in Testicular Germ Cell Tumor (TGCT) and Uterine Corpus Endometrial Carcinoma (UCEC) cohorts, compared to the other 29 cancer cohorts in TCGA. Patients presented a poorer diagnosis when the genes (POU5F1, NANOG, SOX2, SALL4, ABCB1, ABCC1, and ABCG2) were altered. In UCEC cohorts, recurrent patients showed the ABCG2 potentially phosphorylated by the PIM1 kinase. In the TGCT cohort, genes ABCB1 and ABCG2 only appeared in the phosphonetwork in recurrent patients potentially phosphorylated by the same kinase, PIM1, but also by PRKACA. Our data indicate that PRKACA and PIM1 may modulate POU5F1 phosphorylation.

Background: Tophaceous gout, when manifested as a posterior cruciate ligament (PCL) mass within a joint, is uncommon. Differentiating it from other intraarticular pathologies, notably tenosynovial giant cell tumors (TGCT), previously known as pigmented villonodular synovitis (PVNS), proves challenging. This difficulty arises primarily from the resemblances in their presentation on standard radiological tools such as MRI. Notably, the lesion appearance in tophaceous gout closely aligns with that of TGCT. Case report: We present a case of intraarticular tophaceous gout in a 35-year-old male localized in the posterior chamber of the left knee, particularly around the PCL, leading to posterior knee pain and locking. MRI depicted a diffuse lobulated mass encircling the PCL. During arthroscopic debridement, chalky urate crystals were observed on the articular surfaces during the procedure. Biopsies confirmed the diagnosis of intraarticular tophaceous gout, and the patient showcased significant postoperative improvement. Conclusion: While the diagnosis of soft tissue masses in the knee, notably TGCT and tophaceous gout, poses challenges using conventional radiological tools, our literature review indicates that tophaceous gout in the PCL is seldom suspected in the initial diagnosis of intraarticular tumors due to its resemblance to TGCT on MRI. We emphasize the need for a diagnostic protocol to effectively discern intraarticular tumors of the knee.

Aims: Tenosynovial giant cell tumour (TGCT) is a rare benign tumour of the musculoskeletal system. Surgical management is fraught with challenges due to high recurrence rates. The aim of this study was to describe surgical treatment and evaluate surgical outcomes of TGCT at an Australian tertiary referral centre for musculoskeletal tumours and to identify factors affecting recurrence rates. Methods: A prospective database of all patients with TGCT surgically managed by two orthopaedic oncology surgeons was reviewed. All cases irrespective of previous treatment were included and patients without follow-up were excluded. Pertinent tumour characteristics and surgical outcomes were collected for analysis. Results: There were 111 total cases included in the study; 71 (64%) were female, the mean age was 36 years (SD 13.6), and the knee (n = 64; 57.7%) was the most commonly affected joint. In all, 60 patients (54.1%) had diffuse-type (D-TGCT) disease, and 94 patients (84.7%) presented therapy-naïve as "primary cases" (PC). The overall recurrence rate was 46.8% for TGCT. There was a statistically significant difference in recurrence rates between D-TGCT and localized disease (75.0% vs 13.7%, relative risk (RR) 3.40, 95% confidence interval (CI) 2.17 to 5.34; p < 0.001), and for those who were referred in the ”revision cases” (RC) group compared to the PC group (82.4% vs 48.9%, RR 1.68, 95% CI 1.24 to 2.28; p = 0.011). Age, sex, tumour volume, and mean duration of symptoms were not associated with recurrence (p > 0.05). Conclusion: Recurrence rates remain high even at a tertiary referral hospital. Highest rates are seen in D-TGCT and “revision cases”. Due to the risks of recurrence, the complexity of surgery, and the need for adjuvant therapy, this paper further supports the management of TGCT in a tertiary referral multi-disciplinary orthopaedic oncology service. Cite this article: Bone Jt Open 2023;4(11):846–852.

Pexidartinib is a colony-stimulating factor-1 receptor inhibitor approved in the United States for treatment of adult patients with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Because of the risk of severe and potentially fatal hepatotoxicity, pexidartinib is only available through a Risk Evaluation and Mitigation Strategy (REMS) program. Pexidartinib pharmacokinetics are influenced by the fat content of meals: compared with the fasted state, consuming a high-fat meal with pexidartinib increases pexidartinib absorption by 100%; a low-fat meal increases absorption by approximately 60%. Pexidartinib was initially authorized to be taken at 800 mg/day on an empty stomach; therefore, if this same dose of pexidartinib is taken with food, there is a risk of overexposure and potential toxicity. To reduce the risk of hepatotoxicity and improve patient compliance, pexidartinib has undergone a revised dosing regimen, from 800 mg/day (400 mg twice daily) fasted to 500 mg/day (250 mg twice daily) with a low-fat meal (approximately 11–14 g of total fat). The objective of this report is to educate clinical and allied health professionals on the revised dosing regimen and the importance of patient compliance with a low-fat meal. Healthcare professionals need to understand the rationale for the switch from pexidartinib dosing on an empty stomach to dosing with a low-fat meal and how meal composition and timing influence pharmacokinetics. Finally, we provide guidance for the healthcare team of prescribing providers, nurses, pharmacists, and dietitians who are caring for patients with TGCT on pexidartinib. It is important for healthcare providers to deliver consistent messaging on the low-fat meal requirement and help patients fit pexidartinib into their regular meal schedules. Consulting a dietitian may be helpful for patients, especially those with complex dietary needs. We provide an overview of the roles and responsibilities of each healthcare professional and outline steps to best support patients, including key questions and answers related to the revised dosing regimen. This report provides the information necessary to guide the multidisciplinary team caring for patients with TGCT and to support them through the pexidartinib dosing regimen change. [ABSTRACT FROM AUTHOR]

Background: Tenosynovial giant cell tumor (TGCT) is a benign proliferative disease affecting synovial membranes. There are 2 forms, localized (L-TGCT) and diffuse (D-TGCT), which although histologically similar behave differently. It is locally invasive and is treated in most cases by operative excision. The aim of this study was to assess current practice, how the patients' presentation affected their outcome, as well as review the recurrence rates and complications. Methods: A retrospective analysis of 123 cases was performed in patients treated between 2003 and 2019 with TGCT of the foot and/or ankle. Data were collected on age at presentation, radiologic pattern of disease, location of disease, treatment provided, and recurrence rates. The minimum follow-up was 2 years with a mean of 7.7 years. Results: There were 61.7% female patients with a mean age of 39 (range, 11-76) years. L-TGCT accounted for 85 (69.1%) cases and D-TGCT for 38 (30.9%). The most prevalent preoperative symptoms were a palpable mass (78/123) and pain (65/123). Radiologically confirmed recurrence in the operative group was noted in 14.5% (16/110) cases. This comprised 4% (3/75) of operatively treated L-TGCT and 37% (13/35) of operatively treated D-TGCT. Patients with pain on presentation and those with erosive changes on presenting magnetic resonance imaging (MRI) were more likely to have persistent postoperative pain (P <.001 for both). Where patients had both preoperative pain and erosive changes, 57.1% had postoperative pain. Thirteen cases were managed nonoperatively where symptoms were minimal, with 1 case requiring surgery at a later date. Conclusion: Outcomes of TGCT management are dependent on the disease type, extent of preoperative erosive changes, and presence of preoperative pain. These data are useful for counseling patients regarding the outcomes of surgical intervention and help guide the timing of intervention. Level of Evidence: Level III, retrospective cohort study. [ABSTRACT FROM AUTHOR]

PurposeThe purpose of this study was to evaluate the psychometric properties of the PROMIS-Physical Function (PF) and Worst Stiffness Numeric Rating Scale (NRS) among patients with tenosynovial giant cell tumors (TGCT).MethodsMeasurement properties of the customized lower extremity (LE) and upper extremity (UE) PROMIS-PF scales and Worst Stiffness NRS were assessed using data from the Phase 3 ENLIVEN trial (n = 120). Anchor- and distribution-based analyses were utilized to derive a responder threshold for meaningful change over time. The Patient Global Rating of Concept (PGRC)-Physical Functioning and Patient Global Impression of Change (PGIC)-Stiffness served as anchors. Responsiveness and responder threshold analyses were from baseline to week 25.ResultsCronbach's alpha values for internal consistency reliability were 0.93 and 0.91 for the PROMIS-PF LE and UE, respectively. Test-retest reliability intra-class correlation coefficients were > 0.75 for both instruments. Convergent validity for both instruments was supported by moderate to strong correlations (≥0.30) with the Brief Pain Inventory and EQ-5D. Known-groups validity was established between subgroups stratified by pain level (p

Background: It has been estimated that microorganisms are involved in the pathogenesis of approximately 20% of all cancers. Testicular germ cell tumours (TGCTs) are the most common type of malignancy in young men and arise from the precursor cell, germ cell neoplasia in situ (GCNIS). The microbiome of seminal plasma and testicular tissue has not been thoroughly investigated in regard to TGCTs. Objectives: To investigate the differences in the seminal plasma microbiome between men with TGCT or GCNIS‐only compared with controls. Materials and methods: The study population consisted of patients with GCNIS‐only (n = 5), TGCT (n = 18), and controls (n = 25) with different levels of sperm counts in the ejaculate. RNA was isolated from the seminal plasma and sequenced. Reads not mapping to the human genome were aligned against a set of 2784 bacterial/archaeal and 4336 viral genomes using the Kraken pipeline. Results: We identified reads from 2172 species and most counts were from Alteromonas mediterranea, Falconid herpesvirus 1, and Stigmatella aurantiaca. Six species (Acaryochloris marina, Halovirus HGTV‐1, Thermaerobacter marianensis, Thioalkalivibrio sp. K90mix, Burkholderia sp. YI23, and Desulfurivibrio alkaliphilus) were found in significantly (q‐value < 0.05) higher levels in the seminal plasma of TGCT and GCNIS‐only patients compared with controls. In contrast, Streptomyces phage VWB was found at significantly higher levels among controls compared with TGCT and GCNIS‐only patients combined. Discussion: Often the microbiome is analysed by shotgun or 16S ribosomal sequencing whereas our present data build on small RNA sequencing. This allowed us to identify more viruses and phages compared with previous studies but also makes the results difficult to directly compare. Conclusion: Our study is the first to report identification of the microbiome species in seminal plasma of men with TGCT and GCNIS‐only, which potentially could be involved in the pathogenesis of TGCTs. Further studies are, however, needed to confirm our findings. [ABSTRACT FROM AUTHOR]

Pexidartinib, an oral small molecule inhibitor of the colony‐stimulating factor 1 receptor, is approved for treatment of adults with symptomatic tenosynovial giant cell tumor associated with severe morbidity or functional limitations and not amenable to improvement with surgery. The original dosing regimen is 400 mg of pexidartinib (2 × 200‐mg capsules) twice daily, administered on an empty stomach at least 1 hour before or 2 hours after a meal or snack. Because pexidartinib is likely to be taken over an extended period of time, the ability to take pexidartinib with a meal would simplify timing of administration and potentially improve compliance. Since administering 400 mg of pexidartinib with a low‐fat meal increases exposure by ≈60% relative to the fasted state, administering 250 mg of pexidartinib with a low‐fat meal (low‐fat meal dosing regimen) was predicted to achieve an exposure similar to 400 mg administered during a fasted state (original dosing regimen). Based on clinical trial simulations with two one‐sided t‐tests and bootstrapping (ie, resampling) analyses, a bioequivalence study (n = 24) would have >90% power to conclude that the original dosing regimen (400 mg fasted twice daily) and the low‐fat meal dosing regimen (250 mg with a low‐fat meal twice daily) are bioequivalent. This report provides the outcome of the implementation of the model‐informed drug development strategy to recommend and justify a low‐fat meal dosing regimen for pexidartinib that has the potential to improve patient compliance while maintaining drug exposure. [ABSTRACT FROM AUTHOR]

Testicular germ-cell tumors (TGCT) have been widely recognized for their outstanding survival rates, commonly attributed to their high sensitivity to cisplatin-based therapies. Despite this, a subset of patients develops cisplatin resistance, for whom additional therapeutic options are unsuccessful, and ~20% of them will die from disease progression at an early age. Several efforts have been made trying to find the molecular bases of cisplatin resistance. However, this phenomenon is still not fully understood, which has limited the development of efficient biomarkers and precision medicine approaches as an alternative that could improve the clinical outcomes of these patients. With the aim of providing an integrative landscape, we review the most recent genomic and epigenomic features attributed to chemoresponse in TGCT patients, highlighting how we can seek to combat cisplatin resistance through the same mechanisms by which TGCTs are particularly hypersensitive to therapy. In this regard, we explore ongoing treatment directions for resistant TGCT and novel targets to guide future clinical trials. Through our exploration of recent findings, we conclude that epidrugs are promising treatments that could help to restore cisplatin sensitivity in resistant tumors, shedding light on potential avenues for better prognosis for the benefit of the patients. [ABSTRACT FROM AUTHOR]

BackgroundTenosynovial giant cell tumors (TGCTs) or giant cell tumors of tendon sheath are neoplasms that arise in the synovium. They can be categorized as nodular (localized) or diffuse type (D-TGCT). Historically, surgery has been the mainstay of therapy, but diffuse type disease recurs at a high rate and treatment often requires increasingly morbid procedures. Elucidation of the importance of the colony-stimulating factor (CSF1)/CSF1 receptor (CSF1R) pathway in the pathogenesis of this disease has created significant interest in targeting this pathway as a novel TGCT treatment approach. Pexidartinib, a selective tyrosine kinase inhibitor against CSF1R, showed an 83% disease control rate (52% with partial response and 31% with stable disease) in a recent phase 1 study of patients with TGCT.Case presentationWe present an illustrative example of a TGCT patient who would have required a morbid operation who derived considerable clinical benefit from pexidartinib treatment. Her tumor volume decreased by 48% after 4 months of treatment, and 55 months after starting treatment the patient exhibits continued disease stability with minimal clinical symptoms, and significant improvement in functional status.ConclusionsThis case illustrates the effectiveness of systemic therapy in controlling a disease associated with high surgical morbidity. This approach may be especially useful in the treatment of extra-articular disease which often invades neurovascular bundles; as the effectiveness in metastatic disease is still unknown. In the future, systemic treatment for TGCT may be appropriate for the neoadjuvant setting to decrease disease burden prior to surgery with the aim of decreasing recurrence rates. However, properly designed prospective studies will need to be carried out to answer these questions.

Diffuse-type tenosynovial giant cell tumour (D-TGCT) is a non-malignant but locally aggressive tumour driven by overexpression of colony-stimulating factor-1 (CSF1). CSF1R inhibitors are potential therapeutic strategies for patients not amenable to surgery. We report here the long-term outcome of nilotinib in patients with advanced D-TGCT treated within a phase II prospective international study (ClinicalTrials.gov: NCT01261429). Patients were enrolled between December 2010–September 2012 at 11 cancer centres. Eligible patients had histologically confirmed D-TGCT, not amenable to surgery. Patients received nilotinib until evidence of progression, toxicity or a maximum of one year. Long-term data were retrospectively collected after the completion of the phase II trial. Patients with nilotinib treatment ≥12 weeks and follow-up ≥12 months were included for long-term analysis. Forty-eight of 56 enrolled patients were included. Median treatment duration was 11 months; 31 (65%) patients completed the treatment protocol. After 102 months of follow-up (median; range 12–129), 25 patients (52%) had progression. The median progression-free survival (PFS) was 77 months. The five-year PFS rate was 53%. Fifteen patients (n = 15/46; 33%) experienced clinical worsening after 11 months (median). Twenty-seven patients (58%) received additional treatment, after which eleven patients (n = 11/27; 41%) had a second relapse. Nine patients required a subsequent treatment, primarily other CSF1R inhibitors (n = 6/9; 67%). No unfavourable long-term effects were observed. This long-term analysis of nilotinib for advanced D-TGCT showed that about half of the patients had progression and underwent additional treatment after 8.5 years follow-up. Contrarily, several patients had ongoing disease control after limited treatment duration, demonstrating the mixed effect of nilotinib. • TGCT is mainly driven by CSF1 overexpression. • Nilotinib was the CSF1R inhibitor investigated in a phase II clinical trial in TGCT. • This is the first study describing the long-term efficacy of nilotinib on D-TGCT. • Nilotinib showed mixed long-term efficacy regarding progression-free survival. • The current role of nilotinib in TGCT is questionable. [ABSTRACT FROM AUTHOR]

Background: Testicular germ cell tumors (TGCTs) are the most common young male malignancy with a steadily rising incidence. Standard clinical practice is radical orchidectomy of suspicious lumps followed by histopathological diagnosis and tumor subtyping. This practice can lead to complications and quality of life issues for the patients. Liquid biopsies, especially cell-free DNA (cfDNA), promised to be true surrogates for tissue biopsies, which are considered dangerous to perform in cases of testicular tumors. In this study, we have performed a systematic review on the potential of cfDNA in TGCT patient management, its potential challenges in translation to clinical application and possible approaches in further research. Materials & Methods: The review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines on EuropePMC and PUBMED electronic databases, with the last update being on October 21, 2021. Due to the high heterogeneity in identified research articles, we have performed an overview of their efficacy. Results: Eight original articles have been identified on cfDNA in TGCT patients published from 2004 to 2021, of which six had more than one TGCT patient enrolled and were included in the final analysis. Three studies investigated cfDNA methylation, one has investigated mutations in cfDNA, two have investigated cfDNA amount, and one has investigated cfDNA integrity in TGCT. The sensitivity of cfDNA for TGCT was found to be higher than in serum tumor markers and lower than miR-371a-3p, with comparable specificity. cfDNA methylation analysis has managed to accurately detect teratoma in TGCT patients. Conclusion: Potential challenges in cfDNA application to TGCT patient management were identified. The challenges relating to the biology of TGCT with its low mutational burden and low cfDNA amounts in blood plasma make next-generation sequencing (NGS) methods especially challenging. We have also proposed possible approaches to help find clinical application, including a focus on cfDNA methylation analysis, and potentially solving the challenge of teratoma detection. [ABSTRACT FROM AUTHOR]

Simple Summary: Despite having a favorable response to platinum-based chemotherapies, ~15% of Testicular Germ-Cell Tumor (TGCT) patients are platinum-resistant. Incidence and mortality of this disease has remained unchanged in Latin populations unlike the rest of the world. To date, the search for genetic variants in our population remains unexplored. The aim of this study is to identify predictive biomarkers of resistance to platinum-based therapy, whether general or specific to the Latin population. We observed that sensitivity to chemotherapy does not seem to be explained by any of the mutations detected. However, we identified amplifications on segment 2q11.1 as a novel variant with chemosensitivity biomarker potential. Our data shed light into understanding platinum resistance in a Latin-origin population. Despite having a favorable response to platinum-based chemotherapies, ~15% of Testicular Germ-Cell Tumor (TGCT) patients are platinum-resistant. Mortality rates among Latin American countries have remained constant over time, which makes the study of this population of particular interest. To gain insight into this phenomenon, we conducted whole-exome sequencing, microarray-based comparative genomic hybridization, and copy number analysis of 32 tumors from a Mexican cohort, of which 18 were platinum-sensitive and 14 were platinum-resistant. We incorporated analyses of mutational burden, driver mutations, and SNV and CNV signatures. DNA breakpoints in genes were also investigated and might represent an interesting research opportunity. We observed that sensitivity to chemotherapy does not seem to be explained by any of the mutations detected. Instead, we uncovered CNVs, particularly amplifications on segment 2q11.1 as a novel variant with chemosensitivity biomarker potential. Our data shed light into understanding platinum resistance in a Latin-origin population. [ABSTRACT FROM AUTHOR]

Abstract Purpose The purpose of this study was to evaluate the psychometric properties of the PROMIS-Physical Function (PF) and Worst Stiffness Numeric Rating Scale (NRS) among patients with tenosynovial giant cell tumors (TGCT). Methods Measurement properties of the customized lower extremity (LE) and upper extremity (UE) PROMIS-PF scales and Worst Stiffness NRS were assessed using data from the Phase 3 ENLIVEN trial (n = 120). Anchor- and distribution-based analyses were utilized to derive a responder threshold for meaningful change over time. The Patient Global Rating of Concept (PGRC)-Physical Functioning and Patient Global Impression of Change (PGIC)-Stiffness served as anchors. Responsiveness and responder threshold analyses were from baseline to week 25. Results Cronbach’s alpha values for internal consistency reliability were 0.93 and 0.91 for the PROMIS-PF LE and UE, respectively. Test-retest reliability intra-class correlation coefficients were > 0.75 for both instruments. Convergent validity for both instruments was supported by moderate to strong correlations (≥0.30) with the Brief Pain Inventory and EQ-5D. Known-groups validity was established between subgroups stratified by pain level (p

Abstract Background Tenosynovial giant cell tumor (TGCT), a rare, locally aggressive neoplasm of the synovium of joints and tendon sheaths, is associated with joint destruction, pain and swelling. Impacts on physical function (PF) vary depending on tumor size and location. The aim of this study was to identify relevant items, and demonstrate the content validity of custom measures of lower extremity PF from the Patient-Reported Outcomes Measurement Information System Physical Function Physical Function (PROMIS-PF) item bank among patients with TGCT. Methods Patients were recruited for qualitative research interviews to identify predominant TGCT symptoms and impacts. Patients completed a checklist to evaluate the relevance of each PROMIS-PF item. The publicly available PROMIS-PF item response theory (IRT) parameters were used to select items representing the range of the latent PF trait. Results Participants (n = 20) were 75% female, mean age 42.5 years. TGCTs were located in the knee (n = 15), hip (n = 3), and ankle (n = 2). Fifty-four PROMIS-PF items were identified as relevant by ≥20% of the participants. PF concepts discussed by participants during the qualitative interviews were also used to select relevant items. Selected items (n = 13) were used to create a physical function subscale specific to lower extremity tumors. Conclusions We describe a novel method of combining qualitative research and IRT-based item information to select a relevant and content valid subset of PROMIS-PF items to assess heterogeneous impacts on PF in TGCT, a rare disease population.

Dysregulation of the ubiquitin–proteasome pathway is strongly associated with cancer initiation and progression. Speckle-type POZ(pox virus and zinc finger protein) protein(SPOP) is an adapter protein of CUL3-based E3 ubiquitin ligase complexes. Gene expression profiling from the Cancer Genome Atlas (TCGA) suggests that SPOP is downregulated in testicular germ cell tumors (TGCTs), but the specific contribution of this protein remains to be explored. In this study, we show that the germ line-specific factor DPPA2 was identified as a proteolytic substrate for the SPOP-CUL3-RBX1 E3 ubiquitin-ligase complex. SPOP specifically binds to a SPOP-binding consensus (SBC) degron located in DPPA2 and targets DPPA2 for degradation via the ubiquitin–proteasome pathway. SPOP downregulation increases the expression of pluripotency markers OCT4 and Nanog but decreases that of early differentiation marker gene Fst. This effect is partly dependent on its activity toward DPPA2. In addition, the dysregulation of SPOP-DPPA2 axis contributes to the malignant transformation phenotypes of TGCT cells. • SPOP binds to and induces degradative ubiquitination of DPPA2 by recognizing typical SPOP-binding motif in the domain of DPPA2. • SPOP downregulation led to an increase in Oct4 and Nanog, but decreased the expression of Fst, this process is partly through DPPA2. • Dysregulation of SPOP–DPPA2 axis contribute the malignant transformation phenotypes of TGCT cells. [ABSTRACT FROM AUTHOR]

Pexidartinib is a kinase inhibitor that induces tumor response and improvements in symptoms and functional outcomes in adult patients with symptomatic tenosynovial giant cell tumor (TGCT). A population pharmacokinetic (PK) model for pexidartinib and its metabolite, ZAAD, was developed, and effects of demographic and clinical factors on the PK of pexidartinib and ZAAD were estimated. The analysis included pooled data from 7 studies in healthy volunteers (N = 159) and 2 studies in patients with TGCT or other solid tumors (N = 216). A structural 2‐compartment model with sequential zero‐ and first‐order absorption and lag time, and linear elimination from the central compartment adequately described pexidartinib and ZAAD PKs. Clearance of pexidartinib was estimated at 5.83 L/h in a typical patient with reference covariates (male, non‐Asian, weight = 80 kg, creatinine clearance ≥90 mL/min, aspartate aminotransferase ≤80 U/L, and total bilirubin ≤20.5 μmol/L). In the covariate analysis, Asians and healthy subjects had modestly lower pexidartinib exposure (21% decrease each) in terms of steady‐state area under the curve values from 0 to 24 hours (AUC0‐24,ss). Effects of body weight, sex, and hepatic function parameters on pexidartinib AUC0‐24,ss were generally <20%. Patients with TGCT with mild renal impairment were predicted to have approximately 23% higher AUC0‐24,ss than those with normal renal function. The effects of covariates on ZAAD exposure were similar to those on pexidartinib. These results indicate small and generally clinically nonmeaningful effects of patient demographic and clinical characteristics on pexidartinib and ZAAD PK profiles. [ABSTRACT FROM AUTHOR]

Tenosynovial giant cell tumor (TGCT) is a mesenchymal tumor arising from the synovium of tendon sheath and joints, characterized by translocation t(1;2)(p13;q37). Clinical behaviors of TGCT range from favorable to locally aggressive and further research is required to lead the identification of novel therapeutic avenues for TGCT. Patient-derived cell lines are an indispensable tool for interrogating molecular mechanisms underlying the progression of disease. However, only one TGCT cell line is currently available from cell banks, and a paucity of adequate patient-derived cells hinders basic and translational research. This study aimed to establish a novel cell line of TGCT. To this end, a novel cell line, NCC-TGCT1-C1 was established from the primary tumor tissue of a 40-year-old female patient with TGCT. The cells exhibited translocation t(1;2)(p13;q37), generating COL6A3-CSF1 fusion gene. The cells were maintained as a monolayer culture through more than 30 passages over 12 months. The cells exhibited continuous growth and the ability for spheroid formation and invasion. When used in a high-throughput assay to evaluate the anti-proliferative effects of 164 anticancer drugs, the cells responded strongly to a kinase inhibitor such as gefitinib, and mitoxantrone. Our results indicate that the novel TGCT cell line, designated NCC-TGCT1-C1, was successfully established and could be used to study TGCT development and the effects of anticancer agents. [ABSTRACT FROM AUTHOR]

Pexidartinib is an orally administered small molecule tyrosine kinase inhibitor. Phase III ENLIVEN study results provided clinical evidence for US FDA approval for treatment of adult patients with symptomatic tenosynovial giant cell tumor associated with severe morbidity or functional limitations and not amenable to improvement with surgery. Recommended dosage is 400 mg orally twice daily on an empty stomach. Long-term follow-up in pooled analyses showed increased response rates compared with those observed in ENLIVEN. Patients on pexidartinib also experience meaningful improvements in range of motion. Side effects associated with pexidartinib are generally manageable; however, there is a risk of potentially life-threatening mixed or cholestatic hepatotoxicity and pexidartinib has a Risk Evaluation and Mitigation Strategy (REMS) program to ensure appropriate monitoring. [ABSTRACT FROM AUTHOR]

Introduction: Tenosynovial giant cell tumor (TGCT) is a benign clonal neoplastic proliferation arising from the synovium often causing pain, swelling, joint stiffness, and reduced quality of life. The optimal treatment strategy in patients with diffuse-type TGCT (dt-TGCT) is evolving. Surgery is the main treatment, with a high recurrence rate and surgery-related morbidity. Radiotherapy is associated with important side effects. TGCT cells overexpress colony-stimulating factor 1 (CSF1). Pexidartinib (Turalio™) is a selective CSF1 R inhibitor, which was recently approved by the FDA for the treatment of TGCT.Areas Covered: This article reviews the pharmacological properties, clinical efficacy, and safety of pexidartinib.Expert Opinion: Pexidartinib was effective with an acceptable safety profile for advanced TGCT in phase I-III studies. The phase III trial (ENLIVEN) in unresectable TGCT met its primary endpoints of overall response rate. These results led to FDA approval for this TGCT population. Mixed or cholestatic hepatotoxicity was observed in rare cases. For this reason, pexidartinib is currently available only through a Risk Evaluation and Mitigation Strategy (REMS) Program in the USA. TGCT significantly impairs patients' quality of life. The approval of pexidartinib has changed the therapeutic armamentarium for this condition. However, strict monitoring of liver function is warranted. [ABSTRACT FROM AUTHOR]

Testicular germ cell tumors (TGCTs) are classified into two main subtypes, seminoma (SE) and non-seminoma (NSE), but their molecular distinctions remain largely unexplored. Here, we used expression data for mRNAs and microRNAs (miRNAs) from The Cancer Genome Atlas (TCGA) to perform a systematic investigation to explain the different telomere length (TL) features between NSE (n  = 48) and SE (n  = 55). We found that TL elongation was dominant in NSE, whereas TL shortening prevailed in SE. We further showed that both mRNA and miRNA expression profiles could clearly distinguish these two subtypes. Notably, four telomere-related genes (TelGenes) showed significantly higher expression and positively correlated with telomere elongation in NSE than SE: three telomerase activity-related genes (TERT , WRAP53 and MYC) and an independent telomerase activity gene (ZSCAN4). We also found that the expression of genes encoding Yamanaka factors was positively correlated with telomere lengthening in NSE. Among them, SOX2 and MYC were highly expressed in NSE versus SE, while POU5F1 and KLF4 had the opposite patterns. These results suggested that enhanced expression of both TelGenes (TERT , WRAP53 , MYC and ZSCAN4) and Yamanaka factors might induce telomere elongation in NSE. Conversely, the relative lack of telomerase activation and low expression of independent telomerase activity pathway during cell division may be contributed to telomere shortening in SE. Taken together, our results revealed the potential molecular profiles and regulatory roles involving the TL difference between NSE and SE, and provided a better molecular understanding of this complex disease. [ABSTRACT FROM AUTHOR]

Pexidartinib has emerged as a promising treatment option for patients with advanced tenosynovial giant cell tumors and could demonstrate encouraging long‐term control in this patient population. This editorial aims to pick out as a central theme the complex and somehow unfortunate registration status of pexidartinib in Europe in comparison with the United States. [ABSTRACT FROM AUTHOR]

• Tenosynovial giant cell tumors (TGCT) are benign lesions that arise from the synovium of tendon sheaths, bursae, and joints. • Spinal involvement is rare and usually associated with the synovial membrane of the facet joints. • Surgical gross total resection is curative and should be the aim of treatment. • Imatinib has been has shown promising results in tumors that are unresectable. Tenosynovial giant cell tumors (TGCTs) are benign neoplasms that arise from the synovium of tendon sheaths, bursae, and joints. We report a rare presentation of TGCT involving the suboccipital spine. [ABSTRACT FROM AUTHOR]

Background The etiology of testicular germ cell tumors (TGCT) is poorly understood, however, exposure to endocrine disrupting chemicals (EDCs) may be related to increased risk. Personal care products, some of which contain EDCs, are widely used on a daily basis and are known to cross the placenta, be present in breastmilk, and are capable of inducing reproductive tract abnormalities. To determine the association between personal care product use during pregnancy and breastfeeding and TGCT risk, an analysis among mothers of TGCT cases and controls was conducted. Methods The US Servicemen's Testicular Tumor Environmental and Endocrine Determinants (STEED) study enrolled TGCT cases and controls and their mothers between 2002 and 2005. The current analysis examined personal care product use during pregnancy among 527 mothers of TGCT cases and 562 mothers of controls. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using unconditional logistic regression adjusting for identified covariates. Results Maternal use of face lotion more than one time per week was associated with a significantly increased risk of TGCT (OR: 1.42, 95% CI: 1.08–1.86, p-trend: 0.01). None of the other products examined (perfume, hairspray, nail polish, hair dye, permanent wave, body lotion, deodorant, sunscreen) were associated with TGCT risk. Conclusions Frequent exposure to face lotion during pregnancy and while breastfeeding may be associated with increased TGCT risk. Further investigation into the endocrine disrupting effects of personal care products is warranted. [ABSTRACT FROM AUTHOR]

Incidence of testicular germ cell tumors (TGCT) has been continuously rising (1-5% per year), (1). In Croatia the incidence of TGCT is increasing at the highest rate in the world. Croatia also has a high rate of mortality compared to other countries (2). Germ cell neoplasia in situ (GCNIS) is a precursor lesion of TGCT's which makes up to 95% of all testicular tumors. TGCT are divided into pure seminomatous tumors and mixed germ cell tumors (non-seminomas). GCNIS is considered to be driven by an interplay of genetic, epigenetic and micro-environmental factors that lead up to an arrest of gonocyte differentiation (3,4). GCNIS is reprogrammed in the development of non-seminomas into embryonal carcinoma (EC) cells, which make up the pluripotent core of the nonseminomas (3). EC cells are highly similar to embryonic stem cells, expressing the same pluripotency markers OCT4, SOX2 and NANOG. EC cells differentiate into teratoma tissue, or retain their pluripotency and high malignancy as in teratocarcinoma (5). The well-known and established experimental mouse model for teratocarcinoma, at the Biology Department of Zagreb's School of Medicine, has been described based on histological/histochemical methods and its molecular signature has not yet been studied (6). The aim of this study was to compare the rate of apoptotic activity in the experimental mouse model as well as in human teratocarcinomas. Caspase-3 is the most important apoptotic executioner caspase in apoptosis and is activated by both intrinsic and extrinsic pathways. Some authors consider that Caspase-3 plays a critical role in ES cell differentiation by negatively regulating the self-renewal machinery of these stem cells, in part by cleaving Nanog (7,8). Formalin-fixed paraffin-embedded tissue from 10 testicular teratocarcinoma from the Ljudevit Jurak Pathology and Cytology Department Archive and 10 animal model tumors from the Biology Department of Zagreb's School of Medicine were used for immunohistochemical detection of Caspase-3. Slides were analyzed semi-quantitatively, at the area of strongest reaction, by two pathologist (S.M. and M.U.), on a scale from 0-3, depending on the percentage of reactive cells. The data were analyzed in GraphPad Prism using the Mann-Whitney test. The results have shown a statistically significant difference in the rate of apoptosis between the human teratocarcinomas and the experimental mouse model, with the mouse model showing a higher rate (more than 25% of positive cells) in 64% of tumors compared to 30% of human tumors with highest reaction. The difference could be in part attributed to the fact that the study was a pilot with a relatively small sample pool, and the difference in biological development and "age" between the human and mouse model teratocarcinomas which was obtained uniformly. Western Blot analysis of Caspase-3 activity should be done to verify the results and a bigger cohort should be studied (Figure 1). [ABSTRACT FROM AUTHOR]

Background: Testicular germ cell tumors (TGCTs) account for only 1% - 2% of all male neoplasma. Objectives: The aim of this study is to evaluate clinicopathological features, treatment options and overall survival (OS) in patients with TGCT in Kermanshah province, Iran. Methods: In this retrospective study, 39 patients that referred to oncology clinic in Kermanshah Province, Iran were included. All patients were diagnosed with TGCT between 2000 and 2014 and completed primary therapy (orchidectomy) than 37 patients was treated with chemotherapy and out of 37 patients, 9 patients were treated with radiotherapy in different parts of body (brain, mediastinal, or retro peritoneal). In the first diagnosis, serum tumor markers such as lactate dehydrogenase, α-fetoprotein, and human chorionic gonadotropin had been measured. Statistical analyses, survival and diagrams were performed using the SPSS 19, Prism and Excel 2007, respectively. Results: The mean age at diagnosis for the patients was 34.6 years (ranging 16 - 63 years). We divided the patients to two age groups, twenty-five (64.1%) were placed in age < 40 years group. Among nine metastatic patients, metastasis to brain, lung, kidney and lung + liver were 44.44%, 33.34%, 11.11 and 11.11%, respectively. The 5-year OS rate was 77.8%. Twenty-one patients had seminoma (53.8%) and 18 (46.2%) had non-seminoma. Conclusions: First of all, seminoma has a higher percentage in TGCT patients. Second, the mean age in TGCT patients is between 30 and 35 years. Third, in our study, brain metastasis had higher prevalence compared to other studies. At last, the OS in our study was similar to those of other studies. [ABSTRACT FROM AUTHOR]

Testicular germ cell tumors (TGCTs) are a common malignancy occurring in young adult men. The various genetic risk factors have been suggested to contribute to TGCT pathogenesis, however, they have a distinct mutational profile with a low rate of somatic point mutations, more frequent chromosomal gains, and aneuploidy. The most frequently mutated oncogenes in human cancers are RAS oncogenes, while their impact on testicular carcinogenesis and refractory disease is still poorly understood. In this mini-review, we summarize current knowledge on genetic alternations of RAS signaling-associated genes (the single nucleotide polymorphisms and point mutations) in this particular cancer type and highlight their link to chemotherapy resistance mechanisms. We also mention the impact of epigenetic changes on TGCT progression. Lastly, we propose a model for RAS-dependent signaling networks, regulation, cross-talks, and outcomes in TGCTs. [Display omitted] • KIT/RAS mutations, SNPs, and amplifications are prevalent in TGCTs. • The frequency and impacts of KIT/RAS mutations differ in SMEs and NSGCTs. • RAS mutations positively correlate with tumor progression. • TP53 and WNT signaling alterations are related to the therapy resistance. [ABSTRACT FROM AUTHOR]

Amplification and/or overexpression of genes encoding tyrosine kinase receptors KIT and ERBB2 have been reported in testicular germ cell tumors (TGCTs). These receptors can bind the adaptor molecule GRB7 encoded by a gene adjacent to ERBB2 at 17q12, a region also frequently gained in TGCTs. GRB7 binding may be involved in the activation of RAS signaling and KRAS2 maps to 12p, which is constitutively gained in TGCT and lies within a minimum overlapping region of amplification at 12pl1.2–12.1, a region we have previously defined. RAS proteins activate BRAF, and activating mutations of genes encoding these proteins have been described in various tumors. Here we determine the relationships between expression levels and activating mutations of these genes in a series of 65 primary TGCTs and 4 TCGT cell lines. High levels of expression and activating mutations in RAS were mutually exclusive events, and activating mutations in RAS were only identified in the seminoma subtype. Mutations in BRAF were not identified. Increased ERBB2 expression was associated with differentiated nonseminoma histology excised from lymph nodes postchemotherapy. Mutation, elevated expression, and correlations between expression levels of KRAS2, GRB7, and KIT are consistent with their involvement in the development of TGCTs.

[Display omitted] Based on knowledge of kinase switch-control inhibition and using a combination of structure-based drug design and standard medicinal chemistry principles, we identified a novel series of dihydropyrimidone-based CSF1R kinase inhibitors displaying exquisite selectivity for CSF1R versus a large panel of kinases and non-kinase protein targets. Starting with lead compound 3 , an SAR optimization campaign led to the discovery of vimseltinib (DCC-3014; compound 20) currently undergoing clinical evaluation for the treatment of Tenosynovial Giant Cell Tumor (TGCT), a locally aggressive benign tumor associated with substantial morbidity. 2021 Elsevier ltd. All rights reserved. [ABSTRACT FROM AUTHOR]