A new drug for endometrial cancer has been approved by the US Food and Drug Administration following a trial which showed an overall response rate of 42.3%. Jemperli (dostarlimab) was developed by GlaxoSmithKline Plc and is administered with a diagnostic developed by Roche. The diagnostic can recognise cancers which are deficient mismatch repair (dMMR), or cancers with a genetic feature that adversely affects the repair of DNA inside cells.