[Stage IIIA: tumor grossly limited to the true pelvis with negative nodes but with histologically confirmed microscopic seeding of abdominal peritoneal surfaces. Stage IIIB: tumor of one or both ovaries with histologically confirmed implants of abdominal peritoneal surfaces, none exceeding 2 cm in diameter; negative nodes. Stage IIIC: abdominal implants greater than 2 cm in diameter and/or positive retroperitoneal or inguinal nodes. ( NCI )]