The Montefiore-Einstein Center for Cancer Care has an on-going cooperative Cancer Bio-specimen Repository and correlative/translational research program to identify prognostic factors for patients with malignant tumors, as well as factors predictive of response to and toxicity of treatment. To support this important scientific work, tissue block submission [primary tumor and peritoneal surface malignancy] along with serum specimens will be mandatory for all patients providing informed consent for bio-specimen submission so that complete tissue microarrays (TMA) may be studied. These inquiries will establish molecular profiles of biomarkers of prognostic and predictive value in patients with gastrointestinal carcinomatosis undergoing treatment in the context of this trial.