Arvinas (ARVN) and Pfizer (PFE) on Tuesday reported "encouraging" preliminary data from an ongoing phase 1b trial of their vepdegestrant drug candidate in combination with Eli Lilly's (LLY) abemaciclib kinase inhibitor in patients with a form of breast cancer.
Trial results from 16 patients with locally advanced or metastatic estrogen receptor positive and human epidermal growth factor receptor 2 negative breast cancer demonstrated a tolerable safety profile for the combination of 200 milligrams of vepdegestrant daily with 150 milligrams of abemaciclib twice daily.
The drug combination showed a clinical benefit rate of 62.5% and an overall response rate of 26.7% among breast cancer patients previously treated with a CDK4/6 inhibitor, the companies said.
Arvinas shares were down more than 2% in recent trading, while Pfizer was off by about 1%.
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