OUTLINE: All patients undergo surgical placement of an indwelling central venous line. Patients receive fluorouracil IV by continuous infusion on days 1-28, leucovorin calcium IV on days 1, 8, 15, and 22, oral dipyridamole on days 1-28, and mitomycin IV every 6 weeks starting on day 1. Treatment repeats every 6 weeks for 4 courses. Patients with a partial or complete response are reevaluated for possible surgical resection. Resected patients resume chemotherapy 4-8 weeks after surgery for an additional 16 weeks. Patients are followed every 6 months for 2 years, then annually until death.