This chapter reviews some of the sentinel Gynecologic Oncology Group (GOG) ovarian trials, describes their rationale, provides summary tables for reference, and is organized into early ovarian cancer (GOG 1, 7601, 7602, 95, 157, 175, 212), advanced ovarian cancer optimal (2, 25, 52, 104, 114, 158, 172, 182, 178, 212, 252), and suboptimal disease (3, 22, 47, 97, 111, 162, 182, 218, 252, 262).