On August 29, 2022 TRACON Pharmaceuticals, Inc. (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 U.S. Food and Drug Administration (FDA) has approved the Investigational New Drug (IND) application for the initiation of a Phase 1/2 clinical trial of YH001 in combination with envafolimab and doxorubicin for the treatment of sarcoma patients, including patients who have not received prior therapy (Press release, Tracon Pharmaceuticals, AUG 29, 2022, View Source [SID1234618723]).

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The Phase 1/2 trial will assess the safety and efficacy of YH001 and envafolimab in patients with the rare sarcoma subtypes of alveolar soft part sarcoma and chondrosarcoma. Additionally, the safety and efficacy of the combination of YH001, envafolimab and doxorubicin will be assessed in the more prevalent sarcoma subtypes of leiomyosarcoma and dedifferentiated liposarcoma.

"We are pleased to receive approval from the FDA to initiate our triplet combination therapy trial in sarcoma, which includes our potentially best-in-class CTLA-4 antibody YH001 and the only subcutaneous checkpoint inhibitor approved anywhere in the world, envafolimab," said Charles Theuer, M.D., Ph.D., TRACON’s Chief Executive Officer. "We look forward to enrolling patients in this trial and giving patients additional options for their sarcoma treatment."

About YH001

YH001, an IgG1 antibody against CTLA-4 invented by Biocytogen, the parent company of Eucure Biopharma, and licensed by TRACON, has shown enhanced antibody dependent cellular cytotoxicity (ADCC) and complement dependent cytotoxicity (CDC) in vitro. In preclinical studies YH001 demonstrated superior T cell activation and superior tumor growth inhibition activity compared to ipilimumab. YH001 also demonstrated superior activity compared to ipilimumab in human transgenic mouse tumor models when combined with a PD-(L)1 antibody. In these models, single agent YH001 depleted regulatory T cells and increased CD8+ T cells in tumor tissue. YH001 has been dosed as a single agent in a Phase 1 trial in China (NCT04699929) and in combination with the PD-1 antibody toripalimab in a Phase 1 trial in Australia (NCT04357756).

About the Phase 1/2 Clinical Trial of YH001, envafolimab and doxorubicin (NCT05448820)

The Phase 1/2 clinical trial is a multicenter, open label study of YH001 initially given in combination with envafolimab, and then given in combination with envafolimab plus doxorubicin in patients with advanced or metastatic sarcoma, followed by Phase 2 cohorts of patients with select histologies of advanced or metastatic sarcoma, including treatment naive patients. The primary objective of the Phase 1 portion of the trial is to determine the recommended phase 2 dose of YH001 in combination with envafolimab and in combination with envafolimab with doxorubicin. The primary objective of the Phase 2 portion is to determine the objective response rate (ORR) of the combination of YH001 and envafolimab in patients with alveolar soft part sarcoma and chondrosarcoma and the ORR of the combination of YH001, envafolimab and doxorubicin in patients with leiomyosarcoma and dedifferentiated liposarcoma.

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 pivotal ENVASARC Phase 2 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.