On September 18, 2023 TRACON Pharmaceuticals (NASDAQ: TCON), a clinical stage biopharmaceutical company utilizing a cost-efficient, CRO-independent product development platform to advance its pipeline of novel targeted cancer therapeutics and to partner with other life science companies, reported that the ENVASARC Phase 2 pivotal trial more than satisfied the futility threshold of 3 responses out of 46 based on the results of the second and final mandated independent data monitoring committee (IDMC) efficacy review, and the trial will continue as planned (Press release, Tracon Pharmaceuticals, SEP 18, 2023, View Source [SID1234635213]).
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The IDMC reviewed interim safety and efficacy data from 46 patients enrolled into cohort C of treatment with single agent envafolimab who completed two on-treatment scans (a minimum of 12 weeks of efficacy evaluations). The objective response rate (ORR) in the initial 46 patients treated with single agent envafolimab was 13% by investigator review and 8.7% by blinded independent central review (BICR). The ORR assessed by BICR, all of which were confirmed responses, more than satisfied the prespecified futility rule and envafolimab monotherapy was generally well tolerated. Median duration of response by BICR was greater than six months. The primary endpoint of the study is achievement of an ORR in nine of 80 patients (11.25%) treated with envafolimab by BICR and median duration of response of greater than six months is a key secondary endpoint.
"Envafolimab continues to demonstrate durable single agent activity and has been generally well tolerated," said James Freddo, M.D., TRACON’s Chief Medical Officer. "Our goal is the demonstration of nine objective responses by BICR in the 80 patient cohort of single agent envafolimab treatment."
"We continue to believe that these data position envafolimab to become a potentially compelling treatment option for patients with the refractory sarcoma subtypes of UPS and MFS based on the ORR and tolerability data to date," said Charles Theuer, M.D., Ph.D., TRACON’s Chief Executive Officer.
The trial has enrolled more than 60 of the planned 80 patients and full accrual of the ENVASARC pivotal trial is expected in the fourth quarter of this year with final data anticipated in mid-2024.
About Envafolimab
Envafolimab (KN035), a single-domain antibody against PD-L1 invented by Alphamab Oncology and licensed by TRACON, is the first approved subcutaneously injected PD-(L)1 inhibitor. Envafolimab was approved by the Chinese NMPA in November 2021 in adult patients with MSI-H/dMMR advanced solid tumors who failed systemic treatment and have no satisfactory alternative treatment options. In December 2019, Alphamab Oncology, 3D Medicines and TRACON entered into a collaboration whereby TRACON has the right to develop and commercialize envafolimab in soft tissue sarcoma in North America. Envafolimab is currently being studied in the ENVASARC Phase 2 pivotal trial in the United States sponsored by TRACON and a Phase 3 pivotal trial in combination with gemcitabine and oxaliplatin in advanced biliary tract cancer patients in China sponsored by TRACON’s corporate partners, Alphamab Oncology and 3D Medicines. TRACON has received orphan drug designation from the U.S. Food and Drug Administration for envafolimab for patients with soft tissue sarcoma and fast track designation from the U.S. Food and Drug Administration for envafolimab (KN035) for patients with locally advanced, unresectable or metastatic undifferentiated pleomorphic sarcoma (UPS) and myxofibrosarcoma (MFS) who have progressed on one or two prior lines of chemotherapy.
About ENVASARC (NCT04480502)
The ENVASARC pivotal trial is a multicenter, open label, randomized, non-comparative, parallel cohort study at 30 top cancer centers in the United States and the United Kingdom that began dosing in December 2020. ENVASARC is enrolling patients with UPS or MFS who have progressed following one or two lines of prior treatment and have not received an immune checkpoint inhibitor. A total of 80 patients will receive treatment with single agent envafolimab at 600 mg every three weeks. The primary endpoint is objective response rate by central review with duration of response a key secondary endpoint.