Pigmented Villonodular Synovitis

DUBLIN, Ireland and OXFORD, United Kingdom, April 14, 2025 (GLOBE NEWSWIRE) -- SynOx Therapeutics Limited (“SynOx”), a late-stage clinical biopharmaceutical company developing of emactuzumab for Tenosynovial Giant Cell Tumours (TGCT), today announced that the United States Food and Drug Administration (FDA) has granted Fast Track Designation (FTD) to emactuzumab for the treatment of TGCT patients that are not amenable to or who would not benefit from surgery. Emactuzumab, a potentially best-in-class CSF-1 receptor (CSF-1R) inhibiting monoclonal antibody, is currently being evaluated in the TANGENT study, a global, multi-centre, randomized, double-blind, placebo-controlled registrational Phase 3 trial. TGCT is a rare, non-malignant but aggressively growing tumour of the synovium, tendon sheaths and bursa membranes primarily located in knee, hip, and ankle joints and caused by excessive production of CSF-1. It is a chronically debilitating disease for patients causing loss of function of the affected joints, as well as pain, stiffness and limited range of motion. Receipt of FTD for TGCT was supported by data from Phase 1/2 clinical studies demonstrating rapid, robust tumour reduction and durable response combined with a manageable safety profile. Emactuzumab has also previously received Orphan Medicinal Project designation from the European Medicines Agency. “The granting of FTD for emactuzumab in TGCT highlights the devastating toll that this disease has on patients, as well as the critical need that remains for new treatment options,” said Elyse Seltzer, M.D., Chief Medical Officer of SynOx Therapeutics. “Based on our clinical work to date, we believe that emactuzumab has significant potential to address key patient needs by offering an effective, short-course treatment with rapid onset and a durable response that allows individuals suffering from TGCT to better manage their disease and move forward with their lives. We look forward to completing the ongoing TANGENT study and progressing emactuzumab toward potential commercialization.” About Fast Track DesignationThe FDA grants Fast Track designation to facilitate the development and expedite the review of medicines to treat serious conditions and fill an unmet medical need. Fast Track status allows for enhanced communication and collaboration between the FDA and drug developers, potentially speeding up the delivery of life-saving treatments to patients. About Tenosynovial Giant Cell Tumour (TGCT)Tenosynovial Giant Cell Tumour (TGCT), previously termed pigmented villonodular synovitis (PVNS), is a type of tumour that affects the soft tissue lining of joints and tendons. TGCTs are categorised as fibrohistiocytic tumours by the WHO classification and are subclassified based on growth patterns (localised and diffuse types) and location (tendon sheath, intra- and extra-articular forms). TGCTs are locally destructive and can be aggressive. The disease causes significant joint pain, stiffness, loss of function and reduced quality of life. While most patients undergo surgery, more than 50% of those with diffuse TGCT experience tumour recurrence within three years. If left untreated, TGCT can cause joint deformity, degenerative changes, and even lead to arthrodesis or amputation in severe cases. About CSF-1 and EmactuzumabCSF-1 (or macrophage colony-stimulating factor) is a cytokine that binds to the CSF-1 receptor (CSF-1R), expressed on macrophages and other immune cells. Emactuzumab is a humanised IgG1 monoclonal antibody targeting CSF-1R, designed to inhibit and deplete macrophages in tumour tissue. Originally developed by Roche, emactuzumab has shown substantial efficacy in clinical studies in TGCT, including an objective response rate of ~71%, rapid tumour reduction, functional improvement, and good tolerability with a manageable safety profile. Emactuzumab may also have utility in other macrophage-driven diseases, and SynOx is actively exploring further development opportunities in these areas. Additional details regarding the ongoing registrational Phase 3 TANGENT study can be found on ClinicalTrials.gov (Identifier: NCT05417789). About SynOx TherapeuticsSynOx Therapeutics Limited is a Dublin and Oxford-based, late-stage clinical biopharmaceutical company developing emactuzumab, a best-in-class monoclonal antibody against CSF-1R, for the treatment of Tenosynovial Giant Cell Tumour (TGCT) and other CSF-1-related and macrophage-driven disorders. SynOx is led by an experienced team of industry professionals with a successful track record of developing and bringing products to commercialization. The company is backed by a strong syndicate of premier life science investors including Forbion, Gilde Healthcare, HealthCap, Bioqube Ventures and Medicxi. Contacts: SynOx Therapeutics Ray Barlow Chief Executive Officer Tel: +44 (0) 208 058 5619 Email: enquiries@synoxtherapeutics.com Vida Strategic Partners (on behalf of SynOx) Tim Brons (Media) 415-675-7402 tbrons@vidasp.com

Newly Appointed Board Chair, Philip Astley-Sparke, Brings Transatlantic Late-Stage Development, Regulatory and Commercial Expertise Strengthened Leadership and Expanded U.S. Presence Positions SynOx for Regulatory Filings and Commercialization of Emactuzumab for Tenosynovial Giant Cell Tumours (TGCT) DUBLIN, Ireland and OXFORD, United Kingdom, April 01, 2025 (GLOBE NEWSWIRE) -- SynOx Therapeutics Limited (“SynOx”), a late-stage clinical biopharmaceutical company developing of emactuzumab for Tenosynovial Giant Cell Tumours (TGCT), today announced the execution of a planned and orderly transition of its board chair position. Philip Astley-Sparke has been appointed as new chair of the board of directors, reflecting SynOx’s ongoing evolution into a global, commercially focused biotechnology company. Mr. Astley-Sparke succeeds Ton Logtenberg, who has served as board chair since 2021, overseeing the company’s growth into a well-funded, late-stage clinical company. With its Phase 3 registrational trial of emactuzumab in TGCT underway, SynOx has evolved its strategic focus to prioritize global regulatory filings, commercial readiness and increasing its transatlantic footprint. This builds upon recent corporate milestones including the raising of a $92 million Series B round of funding and the ongoing build-out of its US executive leadership team. “Ton has been a steady and invaluable partner through a critical period of growth and maturation for SynOx and we are deeply indebted to him for his leadership over the past several years,” said Ray Barlow, Chief Executive Officer of SynOx Therapeutics. “As we embark on our next phase focused on regulatory and commercial activities, we are happy to welcome Philip as our new board chair. His proven experience leading late-stage, transatlantic companies and guiding assets through regulatory approval and launch preparedness will be pivotal as we prepare for the potential commercialization of emactuzumab.” Mr. Astley-Sparke is a seasoned biotechnology executive with a distinguished track record in building and leading innovative companies across immuno-oncology and rare diseases. With over two decades of experience, he has successfully guided multiple organizations from early-stage through to BLA filing with the United States Food and Drug Administration (FDA) and accompanying commercial launch preparations. He has raised over $1.5 billion in capital and held key leadership roles at Replimune Group Inc, where he currently serves as Executive Chairman, uniQure N.V, and BioVex Group Inc. Notably, at BioVex he played a central role in the development of the first FDA-approved oncolytic virus and oversaw a $1 billion acquisition by Amgen. Mr. Astley-Sparke provides SynOx deep expertise in transatlantic biotech operations, in-house manufacturing scale-up, execution of initial public offerings (IPOs), and strategic growth. About Tenosynovial Giant Cell Tumour (TGCT) Tenosynovial Giant Cell Tumour (TGCT), previously termed pigmented villonodular synovitis (PVNS), is a type of tumour that affects the soft tissue lining of joints and tendons. TGCTs are categorised as fibrohistiocytic tumours by the WHO classification and are subclassified based on growth patterns (localised and diffuse types) and location (tendon sheath, intra- and extra-articular forms). TGCTs are locally destructive and can be aggressive. The disease causes significant joint pain, stiffness, loss of function and reduced quality of life. While most patients undergo surgery, more than 50% of those with diffuse TGCT experience tumour recurrence within three years. If left untreated, TGCT can cause joint deformity, degenerative changes, and even lead to arthrodesis or amputation in severe cases. About CSF-1 and Emactuzumab CSF-1 (or macrophage colony-stimulating factor) is a cytokine that binds to the CSF-1 receptor (CSF-1R), expressed on macrophages and other immune cells. Emactuzumab is a humanised IgG1 monoclonal antibody targeting CSF-1R, designed to inhibit and deplete macrophages in tumour tissue. Originally developed by Roche, emactuzumab has shown substantial efficacy in clinical studies in TGCT, including an objective response rate of ~71%, rapid tumour reduction, functional improvement, and good tolerability with a manageable safety profile. Emactuzumab may also have utility in other macrophage-driven diseases, and SynOx is actively exploring further development opportunities in these areas. SynOx recently announced the initiation of the TANGENT study, a global, multi-centre, randomized, double-blind, placebo-controlled Phase 3 trial designed to evaluate the efficacy and safety of emactuzumab in patients with TGCT. Additional study details can be found on ClinicalTrials.gov (Identifier: NCT05417789). About SynOx TherapeuticsSynOx Therapeutics Limited is a Dublin and Oxford-based, late-stage clinical biopharmaceutical company developing emactuzumab, a best-in-class monoclonal antibody against CSF-1R, for the treatment of Tenosynovial Giant Cell Tumour (TGCT) and other CSF-1-related and macrophage-driven disorders. SynOx is led by an experienced team of industry professionals with a successful track record of developing and bringing products to commercialization. The company is backed by a strong syndicate of premier life science investors including Forbion, HealthCap, Bioqube Ventures, Medicxi, and Gilde Healthcare. Contacts: SynOx Therapeutics Ray Barlow Chief Executive Officer Tel: +44 (0) 208 058 5619 Email: enquiries@synoxtherapeutics.com Vida Strategic Partners (on behalf of SynOx) Tim Brons (Media) 415-675-7402 tbrons@vidasp.com

On February 14, 2025, Ono Pharmaceuticals secured FDA approval for vimseltinib, a therapy for tenosynovial giant cell tumor (TGCT), which will be marketed as ROMVIMZA. This approval places Ono in direct competition with another Japanese pharmaceutical company, Daiichi Sankyo, in the TGCT market. LAS VEGAS, March 4, 2025 /PRNewswire/ -- Tenosynovial giant cell tumor, also known as pigmented villonodular synovitis (PVNS) or giant cell tumor of the tendon sheath (GCT-TS), is primarily treated through surgical resection. For localized TGCT, the typical approach involves direct removal of the tumor nodule. In contrast, diffused-type TGCT (DTGCT) tends to present as larger tumors affecting major joints, making treatment more complex. Management options for DTGCT often include total synovectomy, joint replacement, or, in extremely rare cases, amputation. Among the 7MM, the United States had the highest prevalence of tenosynovial giant cell tumor, accounting for approximately 45% of total cases. In 2023, localized TGCT in the U.S. was most commonly found in the digits, representing around 75% of cases. Depending on whether the tumor is localized or diffuse, giant cell tumors can also occur in the knee, ankle, hip, and other areas. According to DelveInsight analysts, diffuse TGCT was most frequently observed in the knee, with an estimated 30,000 cases in the US in 2023. The primary approach to treating TGCT is surgery, often supplemented by alternative options like Radiation Therapy, Radiosynovectomy, and Systemic Therapies, including CSF1 inhibitors and Tyrosine Kinase Inhibitors. TURALIO (pexidartinib, previously known as PLX3397) is a targeted therapy developed by Daiichi Sankyo for adult patients with symptomatic tenosynovial giant cell tumor that leads to significant morbidity or functional limitations and cannot be effectively treated with surgery. This orally administered small-molecule tyrosine kinase inhibitor acts on colony-stimulating factor 1 receptor (CSF1R), KIT proto-oncogene receptor tyrosine kinase (KIT), and FMS-like tyrosine kinase 3 (FLT3) with an internal tandem duplication (ITD) mutation. Overexpression of the CSF1R ligand contributes to excessive cell proliferation and accumulation in the synovium. The US FDA approved TURALIO in August 2019 for the treatment of TGCT in adults with severe symptoms and limited surgical options. Before this, in October 2015, pexidartinib received Breakthrough Therapy Designation (BTD) from the FDA for TGCT treatment. TURALIO carries a risk of serious and potentially life-threatening liver toxicity and is available only through a restricted Risk Evaluation and Mitigation Strategy (REMS) program. Learn more about the FDA-approved TGCT drugs @ Drugs for Tenosynovial Giant Cell Tumors Treatment Recently, in February 2025, Ono Pharmaceuticals secured FDA approval for vimseltinib for the treatment of tenosynovial giant cell tumor. Marketed under the brand name ROMVIMZA, the drug places Ono in direct competition with fellow Japanese pharmaceutical company Daiichi Sankyo in the TGCT space. Like TURALIO, which became the first FDA-approved TGCT treatment in 2019, ROMVIMZA is a colony-stimulating factor 1 receptor (CSF1R) inhibitor. As a kinase inhibitor, it blocks the CSF1 receptor to slow the growth of cells expressing this protein, potentially limiting tumor progression in TGCT. Ono Pharmaceuticals acquired ROMVIMZA through its $2.4 billion purchase of Deciphera Pharmaceuticals last year, making the U.S.-based firm a subsidiary. At the time, Ono's CEO, Gyo Sagara, described the acquisition as a strategic effort to expand the company's targeted oncology pipeline, strengthen its presence in the U.S. and European markets, and enhance its kinase drug discovery expertise. To compete with TURALIO's early market entry, Ono is positioning ROMVIMZA as a more convenient TGCT treatment. Unlike Daiichi Sankyo's drug, which requires twice-daily dosing, ROMVIMZA is administered only twice a week, with at least 72 hours between doses. Additionally, while TURALIO carries a boxed warning for hepatotoxicity due to the risk of severe liver damage, ROMVIMZA does not have this safety warning. To know more about TGCT treatment options, visit @ New Treatment for Tenosynovial Giant Cell Tumors TGCT that is not amenable to improvement from surgery. Several companies, such as SynOx Therapeutics (Emactuzumab), AmMax Bio (AMB-05X), Merck KGaA (pimicotinib), and others, are involved in developing therapies for TGCT. Discover which therapies are expected to grab major TGCT market share @ Tenosynovial Giant Cell Tumors Market Report Pimicotinib is an investigational, orally administered small-molecule inhibitor designed to selectively and effectively target the colony-stimulating factor-1 receptor. Developed by Abbisko, it remains under clinical evaluation. In December 2023, Abbisko Therapeutics agreed with Merck, granting Merck exclusive rights to commercialize pimicotinib-based products for all indications in mainland China, Hong Kong, Macau, and Taiwan, with the possibility of expanding to global markets, including the US. Pimicotinib has been granted Breakthrough Therapy Designation (BTD) by both the China National Medical Products Administration (NMPA) and the FDA, as well as Priority Medicine (PRIME) designation by the European Medicines Agency (EMA) for the treatment of patients with TGCT who are not candidates for surgery. In November 2024, Merck reported that the Phase III MANEUVER trial, conducted by Abbisko Therapeutics, met its primary endpoint. The study showed a significant improvement in the objective response rate (ORR) for patients with tenosynovial giant cell tumor. By week 25, pimicotinib achieved an ORR of 54.0%, compared to 3.2% in the placebo group (p<0.0001). Emactuzumab is a monoclonal antibody that serves as a potent and selective inhibitor of CSF-1R. By interacting with two key cytokines, CSF-1 and IL-34, the CSF-1 receptor plays a crucial role in regulating macrophages and related cells across various biological processes and organ systems. This makes it a compelling target with wide-ranging therapeutic potential. SynOx Therapeutics is currently assessing emactuzumab in the Phase III TANGENT clinical trial. In April 2024, the company secured a $35 million loan facility from Hercules Capital, bolstering its financial position as it advances the trial. Additionally, SynOx successfully completed a $75 million Series B funding round. Earlier, in August 2022, the European Medicines Agency (EMA) granted orphan medicinal product designation to emactuzumab for both localized and diffuse TGCT. AMB-05X is a powerful monoclonal antibody targeting CSF1R, designed as a therapeutic platform for severe macrophage-driven inflammatory, fibrotic, and neovascular conditions. It has received Fast Track designation from the FDA and PRIME designation from the EMA for TGCT. Currently, it is being evaluated in a Phase II clinical trial to assess its safety, tolerability, efficacy, and pharmacokinetics when administered via intra-articular injection in TGCT patients. Discover more about drugs for TGCT in development @ Tenosynovial Giant Cell Tumors Clinical Trials The anticipated launch of these emerging therapies for TGCT are poised to transform the market landscape in the coming years. As these cutting-edge therapies continue to mature and gain regulatory approval, they are expected to reshape the TGCT market landscape, offering new standards of care and unlocking opportunities for medical innovation and economic growth. DelveInsight estimates that the market size for TGCT is expected to grow from USD 300 million in 2023, with a significant CAGR by 2034. This growth can be attributed to the approval of new therapies with improved safety and tolerability compared to pexidartinib, which will significantly impact the treatment landscape in the coming years. This will lead to increased adoption of these new therapies, with patients transitioning from off-label treatments to these newer options during the forecast period (2023‒2034). DelveInsight's latest published market report, titled as Tenosynovial Giant Cell Tumors Market Insight, Epidemiology, and Market Forecast – 2034 will help you to discover which market leader is going to capture the largest market share. The report provides comprehensive insights into the TGCT country-specific treatment guidelines, patient pool analysis, and epidemiology forecast to help understand the key opportunities and assess the market's underlying potential. The TGCT market report proffers epidemiological analysis for the study period 2020–2034 in the 7MM segmented into: Prevalent Cases of TGCT Growth Pattern-specific Prevalent Cases of TGCT Gender-specific Prevalent Cases of Localized TGCT Gender-specific Prevalent Cases of Diffuse TGCT Tumor Location-specific of Localized TGCT Tumor Location-specific Cases of Diffuse TGCT Total Treated Cases of TGCT The report provides an edge while developing business strategies by understanding trends shaping and driving the 7MM TGCT market. Highlights include: 10-year Forecast 7MM Analysis Epidemiology-based Market Forecasting Historical and Forecasted Market Analysis upto 2034 Emerging Drug Market Uptake Peak Sales Analysis Key Cross Competition Analysis Industry Expert's Opinion Access and Reimbursement Download this TGCT market report to assess the epidemiology forecasts, understand the patient journeys, know KOLs' opinions about the upcoming treatment paradigms, and determine the factors contributing to the shift in the TGCT market. Also, stay abreast of the mitigating factors to improve your market position in the TGCT therapeutic space. Related Reports Tenosynovial Giant Cell Tumors Epidemiology Tenosynovial Giant Cell Tumors Epidemiology Forecast – 2034 report delivers an in-depth understanding of the disease, historical and forecasted TGCT epidemiology in the 7MM, i.e., the United States, EU4 (Germany, Spain, Italy, and France), the United Kingdom, and Japan. Tenosynovial Giant Cell Tumors Pipeline Tenosynovial Giant Cell Tumors Pipeline Insight – 2025 report provides comprehensive insights about the pipeline landscape, pipeline drug profiles, including clinical and non-clinical stage products, and the key TGCT companies, including AmMax Bio, Inc., Deciphera Pharmaceuticals SynOx Therapeutics, Abbisko Therapeutics Co, Ltd., Hutchison Medipharma Limited, Elixiron Immunotherapeutics, among others. Rheumatoid Arthritis Market Rheumatoid Arthritis Market Insights, Epidemiology, and Market Forecast – 2034 report deliver an in-depth understanding of the disease, historical and forecasted epidemiology, as well as the market trends, market drivers, market barriers, and key rheumatoid arthritis companies, including Taisho Pharmaceuticals, R-Pharm, GlaxoSmithKline, Aclaris Therapeutics, Pfizer, Abivax, Bristol Myers Squibb, Oscotec, Genosco, Mesoblast, Pfizer Akros Pharma, Japan Tobacco, Abbvie, Horizon Therapeutics, Eli Lilly and Company, Taiho Pharmaceutical, Gilead Sciences, Kiniksa Pharmaceuticals, Istesso, SynAct Pharma, Cyxone, among others. Rheumatoid Arthritis Pipeline Rheumatoid Arthritis Pipeline Insight – 2025 report provides comprehensive insights about the pipeline landscape, pipeline drug profiles, including clinical and non-clinical stage products, and the key rheumatoid arthritis companies, including Taisho Pharmaceutical, Zhejiang Hisun Pharmaceutical, SinoMab, Jiangsu Hengrui Medicine, RemeGen, GlaxoSmithKline, Modern Biosciences, Jiangsu Alphamab Biopharmaceuticals, Akros Pharma, Hanlim Pharm, Galapagos NV, Chong Kun Dang Pharmaceutical, Bristol Myers Squibb, AstraZeneca, Aclaris Therapeutics, Abivax, AbbVie, Synact Pharma, Gilead sciences, Mesoblast, Rottapharm Biotech, Eli Lilly and Company, Kiniksa Pharmaceuticals, Abcentra, Cyxone, Yungjin Pharm. Co., Ltd. Taiho Pharmaceutical, Oscotec Inc., Pfizer, Janssen Research & Development, Cipher Pharmaceuticals Inc., KLUS Pharma Inc., Revolo Biotherapeutics, Lynk Pharmaceuticals, Beijing Baylx Biotech, Hope Biosciences, Kangstem Biotech, Celltex Therapeutics, I-Mab Biopharma Co. Ltd., Synermore Biologics Co., Ltd, Oryn Therapeutics, Arthrogen, Bayer, Amgen, Draconis Pharma, Biozeus, Landos Biopharma, Imcyse, Kymera Therapeutics, RedHill Biopharma, 4D Pharma, CV6 Therapeutics, VYNE Therapeutics, MyMD Pharmaceuticals, Brickell Biotech Inc, Worg Pharmaceuticals, Almirall, Standigm, Metrion Biosciences, Jnana Therapeutics, Silo Pharma, SFA Therapeutics, Neutrolis Therapeutics, Ahead Therapeutics, Fresenius Kabi, Kidswell Bio, BioXpress Therapeutics, CinnaGen, Alvotech, Hetero Biopharma, Shanghai Henlius Biotech, Cadila Pharmaceuticals, Innovent Biologics, Torrent Pharmaceuticals, Emcure Pharmaceuticals, mAbxience, Shanghai Junshi Biosciences, Enosi Therapeutics, among others. 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