GSK announced the US Food and Drug Administration (FDA) accepted the supplemental Biologics License Application (sBLA) for Jemperli (dostarlimab) in combination with chemotherapy for the treatment of adult patients with mismatch repair deficient (dMMR)/microsatellite instability-high (MSI-H) primary advanced or recurrent endometrial cancer.

If approved in this patient population, dostarlimab plus chemotherapy could represent the first meaningful frontline treatment advancement in decades for patients with primary advanced or recurrent endometrial cancer.

The FDA granted Priority Review for this application and assigned a Prescription Drug User Fee Act action date of 23 September 2023. Dostarlimab also was recently granted Breakthrough Therapy designation for this potential new indication.

Under Project Orbis, an initiative from the FDA Oncology Center of Excellence that provides a framework for concurrent submission and review of oncology products among international partners, the dostarlimab sBLA will be reviewed by health authorities in the US, Australia, Canada, Switzerland, Singapore and the United Kingdom.

Hesham Abdullah, Senior Vice President, Global Head of Oncology Development, GSK said: “We are excited about this initial filing for this potential new indication for dostarlimab in the patient population that demonstrated the strongest treatment effect in the phase III RUBY trial. Long-term outcomes for patients with primary advanced or recurrent endometrial cancer remain poor, and there is an urgent need to evolve the current standard of care, which is platinum-based chemotherapy. We look forward to working with the FDA and other health authorities as they review this application.”

Currently, in endometrial cancer, dostarlimab is approved in the US as monotherapy in dMMR recurrent or advanced endometrial cancer that has progressed on or following a prior platinum-containing regimen. If the sBLA is approved, dostarlimab could potentially be indicated earlier in treatment in combination with platinum-containing chemotherapy for patients with dMMR/MSI-H primary advanced or recurrent endometrial cancer.