Prognosis for Ovarian Cancer In women with ovarian cancer, the 5-year survival rates with treatment are Stage I: 85 to 95% Stage II: 70 to 78% Stage III: 40 to 60% Stage IV: 15 to 20% Prognosis is worse when tumor grade is higher or when surgery cannot remove all visibly involved tissue; in such cases, prognosis is best when the involved tissue can be reduced to < 1 cm in diameter or ideally to a microscopic residual amount (cytoreductive surgery).