On December 20, 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 ongoing pivotal Phase 2 ENVASARC trial has enrolled more than 70 of the 80 planned patients in Cohort C of single agent envafolimab treatment at a dose of 600 mg subQ every three weeks (Press release, Tracon Pharmaceuticals, DEC 20, 2023, View Source [SID1234638725]).
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Additional safety and efficacy data were reviewed for 46 patients enrolled into cohort C who were the subject of the September independent data monitoring committee (IDMC) review. At that time, patients had completed a minimum of 12 weeks of efficacy evaluations and the objective response rate (ORR) was 13% by investigator review and 8.7% by blinded independent central review (BICR). Since then, an additional patient has achieved an objective response by investigator review, which increased the ORR by investigator review to 15%. The most recent objective response has not yet been confirmed by BICR and the patient remains on treatment. Median duration of response by BICR remains greater than six months. In addition, envafolimab remains well tolerated and grade > 3 related toxicity has not been reported to date.
"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. "ENVASARC enrollment continues to be brisk, reflecting the high unmet need that exists for these patients."
Updated safety and efficacy data are expected in 1Q 2024, including in the more than 20 patients enrolled following the September IDMC review who will have had a minimum of 12 weeks of efficacy evaluations (two CT scans) at that time.
The primary endpoint of the ENVASARC 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.
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 (FDA) for envafolimab for patients with soft tissue sarcoma and fast track designation from the FDA for envafolimab 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 Phase 2 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. In Cohort C, 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.