On July 15, 2025 Kairos Pharma, Ltd. (NYSE American:KAPA), a clinical-stage biopharmaceutical company focused on innovative cancer therapeutics, reported positive safety results from its ongoing Phase 2 clinical trial of ENV-105 (carotuximab) in patients with metastatic castration-resistant prostate cancer (mCRPC) (Press release, Kairos Pharma, JUL 15, 2025, View Source [SID1234654382]). The interim safety analysis of the trial demonstrated that ENV-105, a first-in-class CD105 antagonist, was well tolerated when combined with standard of care hormone therapy, apalutamide, from the first ten enrolled patients. Thus far, there have been no dose-limiting toxicities or unexpected adverse events reported to date. In addition, the treatment-related side effects were manageable with standard supportive care. Notably, no Grade 3 or 4 toxicities were observed.
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"The favorable safety profile observed in this Phase 2 study is encouraging, as it validates our belief in ENV-105’s clinical potential and supports continued development in a patient population with limited effective treatment options," said John Yu, MD, Kairos Pharma CEO.
With one million men in the US being diagnosed with prostate cancer annually, and millions more worldwide, the development of resistance to current hormone therapies is a growing unmet need with an increasingly aging population. Castration-resistant prostate cancer refers to tumors that grow despite receiving hormone blocking agents. Treatment options remain limited after hormone therapies fail. Kairos Pharma seeks to provide a safe and effective alternative for these patients with ENV-105.
The randomized Phase 2 trial aims to enroll 100 patients in total and is presently accruing patients at Cedars-Sinai Medical Center, City of Hope, and Huntsman Cancer Center. The study is designed to evaluate the safety, tolerability, and early signs of efficacy of ENV-105, a CD105 antagonist, in men whose disease has progressed following standard hormone-based therapies. Interim efficacy data from the trial are expected to be reported in September 2025.
Kairos Pharma plans to engage with regulatory agencies to discuss the design of a potential pivotal Phase 3 study, based on emerging data.