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Treatment of Metastatic Gestational Choriocarcinoma With Oral Methotrexate in a Combat Environment

John H. Farley, MD^*, R. Brian Heathcock, MD, Walter Branch, MD, Wilma Larsen, MD^* and Dallas Homas, MD

*Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, Tripler Army Medical Center, Honolulu, Hawaii; Task Force 325 MED, 325th CSH, Bagram Afghanistan; Combined Joint Task Force 76 Command Surgeon, Bagram Afghanistan

BACKGROUND: Gestational trophoblastic neoplasia (GTN) is a rare neoplastic complication of pregnancy. This disease can be successfully treated with parenteral intravenous or intramuscular chemotherapy. We present a case of metastatic gestational choriocarcinoma following a term pregnancy that was treated successfully with oral methotrexate therapy.

CASE: A 25-year-old, G4 P4, native Afghani with a history of irregular menses since the birth of her son 6 months ago received a physical examination that was within normal limits. Pelvic examination revealed minimal blood in the vault and slight bleeding from a closed cervical os. The uterus was slightly enlarged, 5 weeks in size, and without any adnexal masses. Laboratory evaluation was significant for a positive urine and serum ß-HCG. Pelvic ultrasound examination revealed a 5-cm uterus with a 2-cm endometrial stripe. Chest radiograph revealed multiple bilateral ill-defined pulmonary nodules confirmed by computerized tomography. The patient underwent dilation and curettage productive of a moderate amount of tissue. The patient continued to have positive serum ß-HCGs and was given the presumptive diagnosis of FIGO stage III gestational choriocarcinoma. Because of the lack of intravenous chemotherapeutic agents, the patient was begun on methotrexate 0.40 mg/kg orally on days 1–5, with 9 days off. The patient completed one course of chemotherapy, followed by an interval total abdominal hysterectomy with bilateral salpingo-oophorectomy. The patient had a complete response to therapy and was treated with oral methotrexate for 2 courses after a negative serum ß-HCG. The patient tolerated the chemotherapy without any complication.

CONCLUSION: Methotrexate is routinely used in a parenteral intramuscular fashion for the treatment of gestational choriocarcinoma. Physicians should be aware that, in very limited situations, oral methotrexate in combination with hysterectomy still could offer a patient successful treatment for stage III GTN.