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The purpose of the study is to determine if ABT-751 will decrease tumors, and determine how long the tumor shrinkage can be maintained in patients with colorectal cancer. Patients will receive ABT-751 by mouth daily for 21 days. Patients will be off drug for 7 days before starting the next cycle of drug.
Inclusion Criteria * Colorectal cancer. * Recurrent tumor following treatment with irinotecan and/or oxaliplatin. * Able to tolerate normal activities of daily living. * Adequate bone marrow, kidney, and liver function. Exclusion Criteria * Pregnant or breast feeding. * Anti-tumor therapy within 4 weeks of the start of ABT-751 administration. * Prior radiation therapy. * CNS metastasis.