The fundamental goal of maintenance therapy of cancer is to extend a clinically meaningful survival endpoint (overall, symptom-free, progression-free) while at the same time not substantially interfering with a patient's quality of life. Several phase 3 randomized trials in ovarian cancer involving different anti-neoplastics (e.g., paclitaxel, anti-angiogenic agents, olaparib) have revealed an improvement in progression-free survival with generally acceptable side effect profiles, and as a result represent in appropriately selected patients a rational therapeutic strategy.