Clovis Oncology Inc. is trying to claw its way into ovarian cancer relevance against vastly larger competitors Astrazeneca plc and Glaxosmithkline plc with positive top-line phase III data from its study of PARP inhibitor Rubraca (rucaparib). The study’s monotherapy arm of Rubraca as a first-line maintenance treatment of ovarian cancer hit the primary endpoint of significantly improved investigator-assessed progression-free survival (PFS) compared to placebo. The median PFS was 20.2 months for Rubraca compared to 9.2 months for placebo in the intent-to-treat group.