Vincristine-high-dose methotrexate-citrovorum factor (VCR-MTX-CF) was administered preoperatively at weekly intervals to eight patients, four with primary tumors and four with pulmonary metastases. These patients had not received prior VCR-MTX-CF treatment. A similar treatment program was administered to five patients with pulmonary metastases who had received prior VCR-MTX-CF. Among the eight patients who had not received prior VCR-MTX-CF, complete responses were obtained in three with primary tumors (this was followed by surgical excision) and two with pulmonary metastases. Partial responses occurred in two additional patients. Partial responses were also obtained in two patients who had received VCR-MTX-CF. Chemotherapy and surgery in one patient with an extremity lesion resulted in preservation of the limb and useful function. The major toxicity was anorexia and weight loss. Other side effects included stomatitis, myelosuppression, hepatitis and transient renal impairment. The weekly program was highly effective when compared to responses obtained with the tri-weekly schedule utilized in previous studies.