WTAP

- Preselection Method for Cancers Responding to SLS009: High Efficacy of SLS009 Observed in 67% of ASXL1 Mutated Solid Cancers vs 0% in Non-ASXL1 Mutated Cancers – - ASXL1 Mutations Predictably Identified in Colorectal Cancer (CRC MSI-H) and Non-Small Cell Lung Cancer (NSCLC) in Addition to Hematologic Malignancies - - Existing Clinical Data Demonstrating SLS009 Efficacy in ASXL1 mutated AML and Safety Across Multiple Cancer Types Lay Foundation for Targeted SLS009 Clinical Trial in Selected Solid Cancers - Nov. 27, 2024 -- SELLAS Life Sciences Group, Inc. (NASDAQ: SLS) (“SELLAS’’ or the “Company”), a late-stage clinical biopharmaceutical company focused on the development of novel therapies for a broad range of cancer indications, today announced data from preclinical studies identifying ASXL1 mutation as key predictor of SLS009, a highly selective CDK9 inhibitor, response in solid cancers. Based on elucidated biology of ASXL1 mutations, results from SELLAS’ clinical trials in acute myeloid leukemia (AML), and reports of common occurrence of ASXL1 mutations in some solid cancers, the Company performed experiments and analyses to explore the following: The frequency of ASXL1 mutations in certain solid cancers, including colorectal carcinomas (CRC) with high level microsatellite instability (MSI-H) and non-small cell lung cancer (NSCLC) Whether ASXL1 mutations in solid cancers may predict as high SLS009 efficacy as the efficacy exhibited in AML where ASXL1 and similar mutations demonstrated high response rates in SELLAS’ clinical trials SELLAS performed experiments in patient derived cell lines (PDCs) exposing them to SLS009 at various concentrations and determining the inhibitory concentration (IC50) for each cell line. All cell lines were analyzed for presence of ASXL1 mutations and other genetic markers. High efficacy was prespecified as IC50 Negative controls consisted of untreated cell lines, while active negative control varying concentrations of revumenib (drug used in hematologic malignancies). Positive controls involved cell lines treated with staurosporine at different concentrations (staurosporine is a standard control compound for kinase inhibitors due to its high broad-spectrum potency in inhibiting most protein kinases at sub-micromolar concentrations). The results were as follows: In CRC MSI-H, ASXL1 mutations were observed in 7/12 (58%) of PDCs, aligning with predicted frequency of ~55% In NSCLC, ASXL1 mutations occurred in 2/6 (33%) studied cell lines, higher than predicted 2.6% Overall, in 18 studied solid cancer cell lines, ASXL1 mutations were recorded in 9 cell lines and no ASXL1 mutations were recorded in 9 cell lines which were designated as control In ASXL1 mutated cell lines, high SLS009 efficacy (IC50 In CRC MSI-H, high efficacy (IC50 In NSCLC, high efficacy (IC50 No activity was observed in any of the studied cell lines with revumenib (negative control) at any concentration Staurosporine activity was confirmed, but interestingly and importantly, SLS009 outperformed positive control staurosporine in 5/9 cell lines “These findings are incredibly encouraging and validate our approach to developing a targeted solid tumor therapy. We are excited that our hypotheses were confirmed, marking, to the best of our knowledge, the first study to advance the identification of ASXL1 mutations as a potential biomarker for a drug response in solid cancers,” said Dr. Dragan Cicic, Senior Vice President, Chief Development Officer at SELLAS. “Our experiments show that SLS009 demonstrates high efficacy with low IC50 values and with 67% of mutated cell lines responding positively, compared to no response in non-mutated cell lines. In addition, SLS009 outperformed positive control in 5 out of 9 cell lines, establishing itself as a highly effective therapeutic candidate. These critical findings are the missing pieces, complementing our existing safety and efficacy data in AML, and positions us strongly with SLS009 in solid cancers.” SELLAS has filed for provisional patent protection for the use of ASXL1 mutations as predictive diagnostic for selection of cancer patients likely to benefit based on clinical data and biology. SELLAS is a late-stage clinical biopharmaceutical company focused on the development of novel therapeutics for a broad range of cancer indications. SELLAS’ lead product candidate, GPS, is licensed from Memorial Sloan Kettering Cancer Center and targets the WT1 protein, which is present in an array of tumor types. GPS has the potential as a monotherapy and combination with other therapies to address a broad spectrum of hematologic malignancies and solid tumor indications. The Company is also developing SLS009 (formerly GFH009) - potentially the first and best-in-class differentiated small molecule CDK9 inhibitor with reduced toxicity and increased potency compared to other CDK9 inhibitors. Data suggests that SLS009 demonstrated a high response rate in AML patients with unfavorable prognostic factors including ASXL1 mutation, commonly associated with poor prognosis in various myeloid diseases. For more information on SELLAS, please visit www.sellaslifesciences.com. 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Aug. 06, 2024 -- SELLAS Life Sciences Group, Inc. (NASDAQ: SLS) (“SELLAS” or the “Company”), a late-stage clinical biopharmaceutical company focused on the development of novel therapies for a broad range of cancer indications, today announced that the European Medicines Agency (EMA) has granted Orphan Drug Designation (ODD) for SLS009, a novel, and highly selective CDK9 inhibitor, for the treatment of relapsed/refractory (r/r) peripheral T-cell lymphomas (PTCL). “We are pleased to announce the EMA’s granting of ODD for SLS009, highlighting another important milestone following recent FDA’s Orphan Drug and Fast Track Designations for SLS009 in PTCL,” said Angelos Stergiou, MD, ScD h.c., President and Chief Executive Officer of SELLAS. “PTCL is an aggressive form of lymphoma with limited treatment options, underscoring the urgent need for new and effective therapies. We are delighted that the potential of SLS009 has been recognized by both regulatory agencies and across multiple indications including acute myeloid leukemia (AML), pediatric AML, and pediatric acute lymphoblastic leukemia (ALL). This additional orphan drug designation also highlights our strong internal regulatory expertise, and we look forward to advancing the SLS009 development and our overall clinical programs to deliver its potential benefits to cancer patients.” In the completed dose-escalation portion of the Phase 1 trial in relapsed/refractory hematological malignancies, SLS009 demonstrated favorable safety/tolerability and promising clinical efficacy. Complete or partial responses were observed in AML and lymphoma patients, with a 36.4% response rate achieved specifically in the PTCL patient group, including one patient who remained in continuous treatment for over 56 weeks. The current standard of care for r/r PTCL, belinostat, showed in its pivotal Phase 2 study a 25.8% response rate in a similar patient population to that in the SLS009 Phase 1 clinical trial. Orphan Designation is granted to therapies aimed at the treatment, prevention, or diagnosis of life-threatening or chronically debilitating diseases that affect no more than five in 10,000 persons in the European Union (EU) and for which no satisfactory therapy is available. The treatment must also provide significant benefit to those affected by the condition1. SELLAS is a late-stage clinical biopharmaceutical company focused on the development of novel therapeutics for a broad range of cancer indications. SELLAS’ other lead product candidate, GPS, is licensed from Memorial Sloan Kettering Cancer Center and targets the WT1 protein, which is present in an array of tumor types. GPS has the potential as a monotherapy and combination with other therapies to address a broad spectrum of hematologic malignancies and solid tumor indications. The Company is also developing SLS009 (formerly GFH009) - potentially the first and best-in-class differentiated small molecule CDK9 inhibitor with reduced toxicity and increased potency compared to other CDK9 inhibitors. Data suggests that SLS009 demonstrated a high response rate in AML patients with unfavorable prognostic factors including ASXL1 mutation, commonly associated with poor prognosis in various myeloid diseases. For more information on SELLAS, please visit www.sellaslifesciences.com. References: 1. European Medicines Agency (2023). "Orphan Designation." https://www.ema.europa.eu/en/human-regulatory-overview/orphan-designation-overview The content above comes from the network. if any infringement, please contact us to modify.

- Acute Myeloid Leukemia (AML) is the Second Most Common Hematological Malignancy in Children Often Associated with Poorer Prognosis Compared to Other Pediatric Cancers – - This Recognition Marks SELLAS’ Second RPDD Following the Designation for ALL Received Last Month - - Opened Enrollment for Pediatric AML Patients in Ongoing Phase 2 Clinical Trial - - RPDD Provides Eligibility for SLS009 to Receive a Priority Review Voucher (PRV) Upon Marketing Approval that can be Transferred/Sold to Other Parties – July 16, 2024 -- SELLAS Life Sciences Group, Inc. (NASDAQ: SLS) (“SELLAS” or the “Company”), a late-stage clinical biopharmaceutical company focused on the development of novel therapies for a broad range of cancer indications, today announced that the U.S. Food and Drug Administration (FDA) has granted Rare Pediatric Disease Designation (RPDD) to SLS009, a highly selective CDK9 inhibitor, for the treatment of pediatric acute myeloid leukemia (AML). The FDA previously granted Orphan Drug and Fast Track Designations to SLS009 for the treatment of AML. “Receiving our second Rare Pediatric Disease Designation, following pediatric acute lymphoblastic leukemia last month, is another acknowledgment of SLS009’s novel transformational treatment potential to improve the lives of patients, including children with AML,” said Angelos Stergiou, MD, ScD h.c., President and Chief Executive Officer of SELLAS. ”This designation reinforces our dedication to addressing the urgent needs of children with AML, including those with treatment-resistant mutations, highlighting the promise of SLS009 to offer the specialized care and support they require, especially considering the limited treatment options for rare pediatric diseases. We look forward to continued SLS009 development and enrolling pediatric AML patients in our Phase 2 clinical trial.” AML prognosis with currently available treatments in the refractory and/or relapsed pediatric patient population remains poor. In a representative study, the 5-year overall survival (OS) rate in relapsed pediatric AML was 33% for all patients, and in patients whose remission lasted less than 12 months only 15.7%. In patients who did not achieve complete remission after one course of chemotherapy 5-year overall survival was 0%. About 50% of children with pediatric AML relapse. Generally, the only therapy considered curative in relapsed and refractory patients is a bone marrow transplant and the primary goal of chemotherapy is to achieve remission so that pediatric patients can be transplanted. Rare Pediatric Disease (RPD) Designation is granted by the FDA for serious or life-threatening diseases that affect fewer than 200,000 people in the United States and in which the serious or life-threatening manifestations primarily affect individuals less than 18 years of age. If, in the future, a New Drug Application (NDA) for SLS009 for the treatment of pediatric AML is approved by the FDA, SELLAS might be eligible to receive a Priority Review Voucher (PRV) that could be redeemed to receive a priority review for any subsequent marketing application. PRVs may be used by the sponsor or sold to another sponsor for their use and have recently sold for approximately $100 million. SELLAS is a late-stage clinical biopharmaceutical company focused on the development of novel therapeutics for a broad range of cancer indications. SELLAS’ other lead product candidate, GPS, is licensed from Memorial Sloan Kettering Cancer Center and targets the WT1 protein, which is present in an array of tumor types. GPS has the potential as a monotherapy and combination with other therapies to address a broad spectrum of hematologic malignancies and solid tumor indications. The Company is also developing SLS009 (formerly GFH009) - potentially the first and best-in-class differentiated small molecule CDK9 inhibitor with reduced toxicity and increased potency compared to other CDK9 inhibitors. Data suggests that SLS009 demonstrated a high response rate in AML patients with unfavorable prognostic factors including ASXL1 mutation, commonly associated with poor prognosis in various myeloid diseases. For more information on SELLAS, please visit www.sellaslifesciences.com. The content above comes from the network. if any infringement, please contact us to modify.