Pirtobrutinib

NX-5948 demonstrated robust clinical activity with objective responses observed in 7 of 9 (77.8%) evaluable Waldenstrom’s patients in the ongoing Phase 1a/1b clinical trial Responses are durable and deepen over time with two patients on treatment for greater than one year Data were presented at the 12th International Workshop on Waldenstrom’s Macroglobulinemia (IWWM-12) Oct. 19, 2024 -- Nurix Therapeutics, Inc. (Nasdaq: NRIX), a clinical stage biopharmaceutical company developing targeted protein modulation drugs designed to treat patients with cancer and inflammatory diseases, today announced the presentation of clinical data from its ongoing Phase 1a/1b clinical trial of NX-5948, an orally bioavailable, brain penetrant degrader of Burton’s tyrosine kinase (BTK), in patients with relapsed/refractory Waldenstrom’s macroglobulinemia (WM) at the 12th International Workshop on Waldenstrom’s Macroglobulinemia (IWWM-12) which is being held in Prague, Czech Republic October 17–19, 2024. “We are encouraged by the emerging positive data from NX-5948 in patients with Waldenstrom’s macroglobulinemia, which add to the previously disclosed robust clinical activity observed in patients with chronic lymphocytic leukemia,” said Paula G. O’Connor, M.D., chief medical officer of Nurix. “These data support our decision to advance NX-5948 into the ongoing Phase 1b expansion cohort in patients who have previously received at least one prior line of therapy including a BTK inhibitor and patients presenting with Bing-Neel syndrome, a rare form of WM with central nervous system involvement where NX-5948’s ability to penetrate the brain may offer a distinct advantage.” The data presented at IWWM-12 included previously reported safety findings for all patients in the Phase 1a dose escalation study treated with NX-5948 at doses ranging from 50 mg to 600 mg once daily by oral administration regardless of diagnosis (n=79) based on an April 17, 2024 data cut. NX-5948 demonstrated a tolerable safety profile, and the safety profile for patients with WM was consistent with the safety profile for the overall population (WM patient safety data not shown separately). New data from an October 10, 2024 data cut include the baseline characteristics of the first 13 patients with WM enrolled across both the Phase 1a and Phase 1b portions of the trial, clinical response assessments in 9 response-evaluable patients, and duration on study for all 13 patients. Among the 13 WM patients, the median age was 74 years and the median number of prior lines of therapy was 3. All 13 patients previously had been treated with both BTK inhibitors (BTKi) and chemotherapy/chemo-immunotherapy. Three patients (23.1%) had received prior treatment with the non-covalent BTKi pirtobrutinib, and one patient (7.7%) had received prior treatment with a BCL2 inhibitor. Baseline mutation status in MYD88 and CXCR4 was captured from patient records, and eight patients (61.5%) had mutations in MYD88, and two patients (15.4%) had mutations in CXCR4. Among the nine patients who were evaluable for response, seven patients (77.8%) had an objective response and two patients experienced stable disease (22.2%). All seven responses were observed at the first assessment at 8 weeks, and five remain on treatment with two patients on treatment for longer than one year. Responses were observed in patients regardless of their baseline mutations in MYD88 and CXCR4. Two illustrative cases studies of patients treated with NX-5948 were presented. The first case study is a patient with baseline MYD88 and CXCR4 mutations and four prior lines of therapy, including autologous bone marrow transplantation and ibrutinib, who demonstrated a rapid response observed at the first assessment and remained on study at the time of the October 10, 2024 data cut with greater than one year of treatment (currently in cycle 16; 28 days per cycle). NX-5948 treatment resulted in deepening of response over time as measured by reduction in serum IgM levels, a key biomarker of clinical response in WM patients. The second case study is a patient with baseline MYD88 mutation and three prior lines of treatment, having most recently progressed while on zanubrutinib. This patient also experienced a rapid response at the first assessment with decreasing IgM through treatment which was ongoing in cycle 15 at the time of the October 10, 2024 data cut. The IWWM-1 presentation is available in the Scientific Resources section of Nurix website in the Posters and Presentations section. NX-5948 is an investigational, orally bioavailable, brain penetrant, small molecule degrader of BTK. NX-5948 is currently being evaluated in a Phase 1 clinical trial in patients with relapsed or refractory B cell malignancies. Nurix has previously reported that NX-5948 is highly potent against a range of tumor cell lines that are resistant to current BTK inhibitor therapies, an important consideration in heavily pretreated CLL/SLL patient populations. Additional information on the ongoing clinical trial can be accessed at clinicaltrials.gov (NCT05131022). WM is a rare, slow growing type of non-Hodgkin’s lymphoma that is characterized by the replacement of normal bone marrow cells by malignant lymphocytic cells that produce monoclonal IgM. This replacement leads to anemia, bleeding, and impaired immune function, while the elevated IgM levels may cause neurologic symptoms. In the United States the annual incidence rate is approximately 3 per million or between 1,000 to 1,500 newly diagnosed patients per year. Recommended first-line treatments including chemoimmunotherapy and BTK inhibitor therapy. There are no therapies approved to treat patients after BTKi. Additional therapeutic options are needed. Nurix Therapeutics is a clinical stage biopharmaceutical company focused on the discovery, development and commercialization of innovative small molecules and antibody therapies based on the modulation of cellular protein levels as a novel treatment approach for cancer, inflammatory conditions, and other challenging diseases. Leveraging extensive expertise in E3 ligases together with proprietary DNA-encoded libraries, Nurix has built DELigase, an integrated discovery platform, to identify and advance novel drug candidates targeting E3 ligases, a broad class of enzymes that can modulate proteins within the cell. Nurix’s drug discovery approach is to either harness or inhibit the natural function of E3 ligases within the ubiquitin-proteasome system to selectively decrease or increase cellular protein levels. Nurix’s wholly owned, clinical stage pipeline includes targeted protein degraders of Bruton’s tyrosine kinase, a B-cell signaling protein, and inhibitors of Casitas B-lineage lymphoma proto-oncogene B, an E3 ligase that regulates activation of multiple immune cell types including T cell and NK cells. Nurix is headquartered in San Francisco, California. For additional information visit http://www.nurixtx.com. The content above comes from the network. if any infringement, please contact us to modify.

Objective response rate of 69.2% observed in heavily pretreated patient population including patients with BTK inhibitor resistance mutations Clinical responses in CLL patients were rapid and deepening with longer time on treatment Nurix intends to advance NX-5948 into pivotal trial(s) in 2025 Company will host a webcast conference today, June 16, 2024, at 9:00 a.m. ET (3:00 p.m. CEST) June 16, 2024 -- Nurix Therapeutics, Inc. (Nasdaq: NRIX), a clinical stage biopharmaceutical company developing targeted protein modulation drugs designed to treat patients with cancer and inflammatory diseases, today announced the presentation of updated clinical data for NX-5948, an orally bioavailable degrader of Bruton’s tyrosine kinase (BTK), being evaluated in an ongoing Phase 1a/b clinical trial in adults with relapsed or refractory B-cell malignancies, including CLL and non-Hodgkin lymphoma (NHL). Dr. Kim Linton, M.B.Ch.B, MRCP, Ph.D., FRCP, senior lecturer at the University of Manchester, a consultant at The Christie NHS Foundation Trust and an investigator on the clinical trial, presented the data in an oral session at the European Hematology Association Congress, which is being held from June 13–16, 2024, in Madrid, Spain. “The current results from this study of advanced patients are very impressive for this early stage of development and we are optimistic that NX-5948 has the potential to be an exciting breakthrough for patients with relapsed CLL, particularly in light of the emerging patterns of resistance to the currently available targeted therapies,” said Dr. Linton. “As a clinical investigator, it is highly gratifying to be able to offer patients who are refractory to other therapies a once daily, oral drug that can address a range of CLL disease states.” The data presented at EHA include safety findings for all patients in the Phase 1a dose escalation study regardless of diagnosis (n=79) and include efficacy findings for those patients with relapsed or refractory CLL (n=31). Patients were treated with NX-5948 at doses ranging from 50 mg to 600 mg once daily by oral administration. NX-5948 was well tolerated across all doses evaluated with most common treatment emergent adverse events of purpura/contusion, thrombocytopenia and neutropenia. Among the efficacy evaluable patients with CLL (n=26), NX-5948 treatment resulted in a robust objective response rate (ORR) of 69.2% across all doses tested with responses observed as early as the first scan (8 weeks) and with many patients experiencing deepening of their response with longer time on treatment. All responses remained ongoing as of the April 17 data cutoff. This cohort of CLL patients was a heavily pretreated population that had received a median of four prior lines of therapy (range = 2–14) including prior covalent BTK inhibitors (96.8%), prior BCL2 inhibitors (90.3%), and prior non-covalent BTK inhibitors (25.8%). At baseline, a large number of patients had mutations associated with BTK inhibitor resistance including mutations in BTK (43.3%) and PLC2G (20.0%). Poor prognostic features were common including TP53 mutations (46.7%), and two patients (6.5%) had central nervous system (CNS) involvement. Responses were observed across all populations regardless of prior treatment, baseline mutations, or CNS involvement. Dr. Linton also presented an updated case report that detailed the response of one patient who entered the study with CLL with CNS involvement after having undergone three prior therapies, including treatment with a BTK inhibitor. After daily treatment with 100 mg, and later 300 mg, of NX-5948, the patient exhibited a deepening response approaching complete response criteria by 36 weeks, with elimination of malignant cells in the cerebrospinal fluid (CSF) by 24 weeks. Another case report presented by the company involved a patient who had received eleven prior lines of therapy, including all available BTK inhibitors (ibrutinib, acalabrutinib, zanubrutinib, and pirtobrutinib). After daily treatment with 200 mg of NX-5948, the patient achieved a response by week 8 which deepened over time and was ongoing with over 6 months of follow up. “The responses we are observing across the entire CLL cohort at all dose levels are extremely encouraging. As a next step, we will expand the Phase 1b portion of the trial across a range of CLL subpopulations to prepare for initiation of pivotal, registration-directed clinical evaluation in 2025,” said Paula G. O’Connor, M.D., chief medical officer of Nurix. “While we did not cover the clinical activity data from the NX-5948 study in the various subtypes of NHL in this presentation, we have observed responses across subtypes including complete responses in patients with advanced DLBCL, MCL, MZL, and PCNSL, as well as consistent responses in advanced WM. We look forward to presenting additional data from the study for both CLL and NHL as it matures and to providing further details around our plans for the next stage of development of NX-5948.” “With a growing body of positive clinical data, demonstrated activity in the CNS and a favorable safety profile, NX-5948 is emerging as a best-in-class medicine that has the potential to provide an important treatment option for patients with CLL and NHL,” said Arthur T. Sands, M.D., Ph.D., president and chief executive officer of Nurix “We intend to move rapidly forward with the goal of initiating pivotal trial(s) with NX-5948 in 2025.” On June 16, 2024, at 9:00 a.m., ET (3:00 p.m., CEST), Nurix will host a conference call and webcast to discuss data from the NX-5948 clinical trial and plans for the program. The live webcast, with an accompanying presentation, will be accessible under the Events and Presentations page in the Investors section of the company’s website here. To participate in the live conference call please pre-register online here. A replay of the webcast and call will be archived on the Nurix website for approximately 30 days after the event. NX-5948 is an investigational, orally bioavailable, brain penetrant, small molecule degrader of BTK. NX-5948 is currently being evaluated in a Phase 1 clinical trial in patients with relapsed or refractory B cell malignancies including chronic lymphocytic leukemia / small lymphocytic lymphoma (CLL / SLL), diffuse large B cell lymphoma (DLBCL), follicular lymphoma (FL), mantle cell lymphoma (MCL), marginal zone lymphoma (MZL), primary central nervous system lymphoma (PCNSL) and Waldenström's macroglobulinemia (WM). Additional information on the ongoing clinical trial can be accessed at clinicaltrials.gov (NCT05131022). Nurix Therapeutics is a clinical stage biopharmaceutical company focused on the discovery, development and commercialization of innovative small molecules and antibody therapies based on the modulation of cellular protein levels as a novel treatment approach for cancer, inflammatory conditions, and other challenging diseases. Leveraging extensive expertise in E3 ligases together with proprietary DNA-encoded libraries, Nurix has built DELigase, an integrated discovery platform, to identify and advance novel drug candidates targeting E3 ligases, a broad class of enzymes that can modulate proteins within the cell. Nurix’s drug discovery approach is to either harness or inhibit the natural function of E3 ligases within the ubiquitin-proteasome system to selectively decrease or increase cellular protein levels. Nurix’s wholly owned, clinical stage pipeline includes targeted protein degraders of Bruton’s tyrosine kinase, a B-cell signaling protein, and inhibitors of Casitas B-lineage lymphoma proto-oncogene B, an E3 ligase that regulates activation of multiple immune cell types including T cell and NK cells. Nurix is headquartered in San Francisco, California. For additional information visit http://www.nurixtx.com. The content above comes from the network. if any infringement, please contact us to modify.