Gene Expression Analysis of Patients With Metastatic Colorectal Cancer Receiving Oxaliplatin Based Chemotherapy Regimen

Inclusion Criteria:

* All patients, \>18 years of age, with metastatic/recurrent colorectal cancer are eligible.
* Patients must have a life expectancy of at least 12 weeks.
* Patients must have a Zubrod performance status of 0-2.
* Patients must sign an informed consent.
* Patients should have adequate bone marrow function defined by an absolute peripheral granulocyte count of \> 1,500 or cells/mm3 and platelet count \> 100,000/mm3 and absence of a regular red blood cell transfusion requirement.
* Patients should have adequate hepatic function with a total bilirubin \< 2 mg/dl and SGOT or SGPT \< two times the upper limit of normal, and adequate renal function as defined by a serum creatinine \< 1.5 x upper limit of normal.
* The patient must agree to a biopsy of a sample of tumor for correlative studies.
* The patient is an appropriate candidate for oxaliplatin/capecitabine based chemotherapy.
* The patient must have measurable disease.

Exclusion Criteria:

* Patients with symptomatic brain metastases are excluded from this study.
* Pregnant women or nursing mothers are not eligible for this trial. Patients of child bearing potential must use adequate contraception.
* Patients may receive no other concurrent chemotherapy or radiation therapy during this trial.
* Patients with severe medical problems such as uncontrolled diabetes mellitus or cardiovascular disease or active infections are not eligible for this trial.
* Patients may not have received oxaliplatin previously.
* Patients with a prior unanticipated severe reaction to fluoropyrimidine therapy, or known dihydropyrimidine dehydrogenase (DPD) deficiency, or known hypersensitivity to platinum compounds or any of the components of the study medications.