A multicenter phase 2 study was conducted to assess the antitumor activity of adavosertib in patients with CCNE1 amplified advanced refractory solid tumors.....In 13 patients with measurable high-grade serous ovarian cancer, 5 achieved PR (38.5%) and 8 had stable disease ≥6 months/PR (61.5%). Other PRs were seen in 1 urothelial carcinoma and 1 melanoma.