A Phase I Study of Weekly Gemcitabine in Combination With Infusional Fluorodeoxyuridine and Oral Calcium Leucovorin in Adult Cancer Patients

DISEASE CHARACTERISTICS: Diagnostically proven locally advanced, but unresectable primary or recurrent solid tumors or lymphoma or metastatic solid tumors that have failed standard therapy or no such therapy is available. Objectively measurable disease not required. No patients with leukemia or primary or metastatic CNS malignancies. PRIOR/CONCURRENT THERAPY: Biologic Therapy: Greater than 4 weeks since prior immunotherapy and recovered from all toxic effects. Chemotherapy: Greater than 4 weeks since prior chemotherapy and recovered from all toxic effects with following exceptions: At least 6 weeks since prior mitomycin C or nitrosourea therapy. At least 3 months since prior suramin therapy. Endocrine Therapy: Not specified Radiotherapy: At least 2 weeks since prior radiotherapy (4 weeks if at least 21% of marrow irradiated) and recovered from all toxic effects. Surgery: Recovered from any prior surgery. PATIENT CHARACTERISTICS: Age: 18 and over. Performance status: ECOG 0-2 Hematopoietic: AGC at least 2,000/microL. Platelet count at least 100,000/microL. Hepatic: Bilirubin no greater than 2.0 mg/dL. Renal: Creatinine no greater than 2.0 mg/dL. OTHER: No failure of prior gemcitabine therapy. No concurrent cimetidine (ranitidine and other anti-ulcer agents allowed). No active infection requiring intravenous antibiotic therapy. HIV negative. No other medical contraindication to protocol therapy. No pregnant or nursing women. Adequate contraception required of fertile patients.