Celecoxib, Capecitabine, and Irinotecan in Treating Patients With Recurrent or Metastatic Colorectal Cancer

RATIONALE: Celecoxib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Drugs used in chemotherapy, such as capecitabine and irinotecan, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Giving celecoxib together with capecitabine and irinotecan may kill more tumor cells.
PURPOSE: This phase II trial is studying how well giving celecoxib together with capecitabine and irinotecan works in treating patients with recurrent or metastatic colorectal cancer.