Patients receive fluorouracil IV over 24 hours on day 6 of week 2 and interferon alfa-2b SC and GM-CSF SC 3 times weekly on weeks 3-5. Patients receive 12ATC IV over 15-30 minutes twice weekly and interferon alfa-2b SC (at least 24 hours after 12ATC infusion) once weekly on weeks 6-8. Patients with complete or partial response or stable disease at 3 weeks after the last 12ATC infusion may receive an additional 8-week course as above.