GSK plc announced the European Medicines Agency (EMA) has accepted its application to expand the use of Jemperli (dostarlimab) in combination with standard-of-care chemotherapy (carboplatin and paclitaxel) to all adult patients with primary advanced or recurrent endometrial cancer. The EMA's Committee for Medicinal Products for Human Use will begin the formal review process to make a recommendation to the European Commission, with approval expected in first half of 2025. Currently, in the EU, Jemperli in combination with carboplatin and paclitaxel is approved for the treatment of adult patients who are candidates for systemic therapy with primary advanced or recurrent endometrial cancer that is mismatch repair deficient (dMMR) or microsatellite instability-high (MSI-H).

If this new application is approved, dostarlimab would be expanded to all patients with primary advanced or recurrent endometrial cancer, regardless of their biomarker type, including those with mismatch repair proficient (MMRp)/microsatellite stable (MSS) tumours where currently there are no approved frontline immuno-therapy-based treatments in the EU. The application is based on results from Part 1 of the RUBY phase III trial. The trial met its primary endpoints of investigator-assessed progression-free survival (PFS) and overall survival (OS), demonstrating a statistically significant and clinically meaningful benefit in the overall population of patients treated with dostarlimab plus carboplatin-paclitaxel versus chemotherapy alone.

RUBY Part 1 is the only clinical trial to show a statistically significant overall survival benefit in this patient population. The safety and tolerability analyses from RUBY showed a safety profile for dostarlimab plus carboplatin-paclitaxel that was generally consistent with the known safety profiles of the individual agents. OS data were presented at the Society of Gynecologic Oncology Annual Meeting on Women's Cancer on 16 March 2024, and were published in Annals of Oncology on 9 June 2024.