Fluorouracil, Leucovorin, and Irinotecan in Treating Patients With Recurrent or Refractory Metastatic Unresectable Colorectal Cancer

RATIONALE: Drugs used in chemotherapy, such as fluorouracil, leucovorin, and irinotecan, use different ways to stop tumor cells from dividing so they stop growing or die. Giving more than one chemotherapy drug may kill more tumor cells.
PURPOSE: This phase II trial is studying how well giving fluorouracil together with leucovorin and irinotecan works in treating patients with recurrent or refractory metastatic unresectable colorectal cancer.