Phase II study of medroxyprogesterone acetate plus tamoxifen in advanced endometrial carcinoma: a Gynecologic Oncology Group study.

OBJECTIVES The objectives of this study were to estimate the clinical response rate and toxicity of daily tamoxifen combined with intermittent weekly medroxyprogesterone acetate (MPA). METHODS This study reports the results of 61 patients with measurable advanced or recurrent endometrial carcinoma enrolled on this study to be treated with tamoxifen 40 mg p.o. daily plus alternating weekly cycles of MPA 200 mg p.o. daily. RESULTS One patient was excluded and two patients did not receive study treatment. The percent of patients responding (6 complete and 13 partial) was 33% (95% confidence interval [CI]: 21-46%) among 58 eligible patients who received therapy. Median progression-free survival (PFS) was 3 months and median overall survival (OS) was 13 months. CONCLUSION The combination of daily tamoxifen and intermittent weekly medroxyprogesterone acetate is an active treatment for advanced or recurrent endometrial carcinoma. Further investigation of this combination is appropriate.