Jemperli (dostarlimab) plus chemotherapy is EU approved as the first and only frontline immuno-oncology treatment in the European Union for dMMR/MSI-H primary advanced or recurrent endometrial cancer

Additionally, with the authorisation in this indication, the EC’s conditional approval for Jemperli as a monotherapy for treating adult patients with dMMR/MSI-H recurrent or advanced endometrial cancer that has progressed on or following prior treatment with a platinum-containing regimen is now converted to full approval.

Dr Mansoor Raza Mirza, Chief Oncologist, Copenhagen University Hospital, Denmark and RUBY principal investigator, said: "This European Commission approval is welcomed news as I believe it will define a new standard of care for certain patients with advanced or recurrent endometrial cancer in the EU. The results from the RUBY trial, which led to this approval, underscore the practice-changing potential of dostarlimab for these patients.”

The EC authorisation of Jemperli is based on interim analysis results from the dMMR/MSI-H population of Part 1 of the RUBY/ENGOT-EN6/GOG3031/NSGO phase III trial, which reflected a robust median duration of follow-up of greater than 25 months. The trial met its primary endpoint of investigator-assessed progression-free survival (PFS), demonstrating a statistically significant and clinically meaningful benefit in patients treated with Jemperli plus carboplatin and paclitaxel in the dMMR/MSI-H population. In this population, a 72% reduction in the risk of disease progression or death was observed relative to chemotherapy alone (HR: 0.28 [95% CI: 0.16-0.50]).

In a prespecified, exploratory analysis of overall survival (OS) in the dMMR/MSI-H population, the addition of Jemperli to chemotherapy resulted in a 70% reduction in the risk of death relative to chemotherapy alone (HR: 0.30 [95% CI: 0.13-0.70]).