A clinical trial to look at how well cobimetinib works in combination with another drug called niraparib to slow, stop or reverse the course of ovarian cancer, and whether it works better when it is given with or without another drug called atezolizumab.

A Clinical Study of Cobimetinib Administered in Combination With Niraparib, With or Without Atezolizumab to Patients With Advanced Platinum-sensitive Ovarian Cancer