Incyte’s CDK2 Inhibitor INCB123667 Shows Promising Evidence of Clinical Activity in Patients with Advanced Solid Tumors, Notably Ovarian Cancer

Incyte (Nasdaq:INCY) today announced new early clinical data for INCB123667, a highly selective, potential first-in-class CDK2 inhibitor, in patients with advanced solid tumors. The trial results, presented during a mini-oral presentation at the European Society of Medical Oncology (ESMO) with new, updated data shared during the Company’s investor event, highlight the potential of INCB123667 as a differentiated treatment option for cancers with increased Cyclin E1 activity, amplification and/or overexpression in cells predictive of CDK2 dependency.

In the trial, patients with advanced or metastatic solid tumors (n=205) – including ovarian cancer, endometrial cancer, gastrointestinal cancer, HR+/HER2- breast cancer and triple negative breast cancer, among others – received varying doses of INCB123667 ranging from 50mg to 150mg using once-daily (QD) and twice-daily (BID) dosing schedules.

New data from the Phase 1b dose expansion portion of the trial (data cut-off August 26, 2024) presented today during Incyte’s investor event, demonstrate single-agent antitumor activity, and decreases in circulating tumor DNA (ctDNA) across a range of doses and regimens, notably in patients with ovarian cancer and endometrial cancer whose tumors overexpress Cyclin E1. The trial is ongoing, and the data will continue to mature.

• Of the 37 evaluable participants with platinum-resistant ovarian cancer treated at three (3) selected dose levels (50mg BID, 100mg QD and 125mg QD) in the expansion portion of the trial, nine participants (24.3%) experienced an overall response (OR; 2 complete responses [CR] and 7 partial responses [PRs]). The highest OR rate of 31.3% (5 responders, including 2 CRs) was found in the 50mg BID cohort (16 evaluable participants). Additionally, a disease control rate (DCR) of 75.7% (28/37) was achieved in patients with ovarian cancer.
• In addition, 4 PRs were reported among patients with endometrial cancer.

“The early-stage clinical activity of INCB123667 represents an exciting and promising breakthrough for patients with ovarian cancer. We believe this novel CDK2 inhibitor has the potential to be a foundational treatment for platinum-resistant ovarian cancer, offering a new and differentiated treatment for patients who currently have limited treatment options,” said Pablo Cagnoni M.D., President, Head of Research and Development, Incyte. “We look forward to advancing the development of INCB123667 for the treatment of patients with ovarian cancer both as a single agent and in combination.”