Patients receive fluorouracil IV over 24 hours on days 1, 8, 15, and 22. Patients receive an initial dose of UCN-01 IV over 72 hours beginning on day 2 during course 1 and then maintenance UCN-01 IV over 36 hours beginning on day 2 during subsequent courses. Treatment repeats every 4 weeks for at least 2 courses in the absence of disease progression or unacceptable toxicity.