Objective: Our purpose was to assess the effect of adjuvant platinum-based, multiagent chemotherapy followed by conventional radiotherapy on the recurrence-free interval, patterns of recurrence, and survival of women with completely resected, poor-prognosis endometrial carcinoma. Study Design: Surgical stage IC and II endometrial carcinomas involving the outer one third of myometrium and completely resected stage III and IV carcinomas were eligible for six cycles of cisplatin (Platinol), doxorubicin hydrochloride (Adriamycin), and cyclophosphamide (Cytoxan) (50, 50, 500 mg/m2), followed by external beam radiotherapy to pelvis, pelvis and periaortic chain, or whole abdomen, on the basis of documented disease. Results: Forty-seven women were registered between April 1, 1984, and Oct. 10, 1992; 39 were eligible for review. Six were stage I, 28 were stage III, and five were stage IV. Two tumors were grade I, eight were grade 2, and 29 were grade 3. Twenty-three were endometrioid adenocarcinomas, eight papillary serous, six adenosquamous, and two clear cell. Thirty-seven patients (94.9%) completed six courses of chemotherapy, with no deaths ascribed to treatment. Grade 3 or 4 neutropenia was experienced by 17 (44%) and sepsis by three (8%). Current median follow-up is 27.3 months. Fifteen patients (38.5%) have recurrence, and 14 have died after a median interval of 26.9 months. The 2-year progression-free interval is 72.5% for nonpapillary serous histologic types and 22.5% for papillary serous cancers (p = 0.0074). Conclusion: Adjuvant chemotherapy with Platinol, Adriamycin, and Cytoxan followed by radiation therapy is well tolerated and seems to confer a survival advantage to women with nonpapillary serous endometrial carcinoma with a poor prognosis compared with historic controls treated by surgery or radiotherapy. Objective: Our purpose was to assess the effect of adjuvant platinum-based, multiagent chemotherapy followed by conventional radiotherapy on the recurrence-free interval, patterns of recurrence, and survival of women with completely resected, poor-prognosis endometrial carcinoma. Study Design: Surgical stage IC and II endometrial carcinomas involving the outer one third of myometrium and completely resected stage III and IV carcinomas were eligible for six cycles of cisplatin (Platinol), doxorubicin hydrochloride (Adriamycin), and cyclophosphamide (Cytoxan) (50, 50, 500 mg/m2), followed by external beam radiotherapy to pelvis, pelvis and periaortic chain, or whole abdomen, on the basis of documented disease. Results: Forty-seven women were registered between April 1, 1984, and Oct. 10, 1992; 39 were eligible for review. Six were stage I, 28 were stage III, and five were stage IV. Two tumors were grade I, eight were grade 2, and 29 were grade 3. Twenty-three were endometrioid adenocarcinomas, eight papillary serous, six adenosquamous, and two clear cell. Thirty-seven patients (94.9%) completed six courses of chemotherapy, with no deaths ascribed to treatment. Grade 3 or 4 neutropenia was experienced by 17 (44%) and sepsis by three (8%). Current median follow-up is 27.3 months. Fifteen patients (38.5%) have recurrence, and 14 have died after a median interval of 26.9 months. The 2-year progression-free interval is 72.5% for nonpapillary serous histologic types and 22.5% for papillary serous cancers (p = 0.0074). Conclusion: Adjuvant chemotherapy with Platinol, Adriamycin, and Cytoxan followed by radiation therapy is well tolerated and seems to confer a survival advantage to women with nonpapillary serous endometrial carcinoma with a poor prognosis compared with historic controls treated by surgery or radiotherapy.