Melphalan, 5-fluorouracil, and medroxyprogesterone acetate in metastatic or recurrent endometrial carcinoma. Preliminary report.

The purpose of this study was to evaluate therapy with melphalan, 5-fluorouracil (5-FU), and medroxyprogesterone acetate combination (MFP) in women with metastatic or recurrent endometrial carcinoma not amenable to surgery or radiation therapy, as compared to progesterone therapy alone. Previously, the authors have treated 114 women with progesterone therapy and achieved a 15.8% objective response rate; 7.0% were complete responders. Thirteen women with documented recurrent or metastatic endometrial carcinoma were entered into the MFP study. Thirteen were evaluable for toxicity and 11 for response (2 had no measureable parameter). Treatment consisted of melphalan 0.2 mg/kg/day for 4 days every 4 weeks; 5-FU 15 mg/kg/day for 4 days every 4 weeks; and medroxyprogesterone acetate 1.0 g intramuscularly weekly. Two of the first 3 patients who were treated with this regimen developed severe thrombocytopenia (platelets, 25,000 and 17,000/mm3). Therefore, the remaining 10 patients received 5-FU at a dose of 10 mg/kg/day for 4 days every 4 weeks. Except for 1 patient who devloped thrombophlebitis, there was no other significant toxicity in the 90 courses of therapy received by the 13 women. Of the 11 women evaluable for respone, 6 (54.5%) responded (2 complete responders, 4 partial responders), 2 for stationary disease, and 3 progressed after having had stationary disease for 3, 6, and 9 months, respectively. Of special interest was that the 2 women with adenosquamous carcinoma responded and 1 additional patient with adenocarcinoma maintained a complete response with 5-FU therapy alone.