Genentech has secured Regor Pharmaceuticals' portfolio of CDK inhibitors with an $850 million upfront payment, acquiring a promising breast cancer candidate that has shown single-agent efficacy in patients unresponsive to current treatments. Announced at Roche's Pharma Day, the deal also includes Roche’s acquisition of AntlerA Therapeutics, a biotech specializing in Wnt signaling.
Regor’s next-generation CDK inhibitor, RGT-419B, demonstrated strong phase 1a results in hormone receptor (HR)-positive, HER2-negative breast cancer patients who previously progressed on CDK4/6 inhibitors. The drug, designed to overcome resistance and reduce toxicity, achieved a 28.6% confirmed partial response rate, with no severe adverse events. Regor will continue managing the phase 1 trials, after which Genentech will take over further development and commercialization.
This acquisition complements Roche’s broader push into HR-positive breast cancer, which makes up 70% of cases. Roche is also developing giredestrant, a selective endocrine receptor degrader, and inavolisib, a PI3K inhibitor, which it plans to combine with CDK inhibitors. With the addition of Regor’s CDK portfolio, Roche gains proprietary inhibitors to enhance its treatment offerings.
Additionally, Roche’s acquisition of AntlerA Therapeutics strengthens its focus on ophthalmology, particularly targeting neovascular age-related macular degeneration and diabetic macular edema. These moves align with Roche’s strategic goal of delivering transformative medicines in areas of high societal impact.