An Analysis of the Response of Human Tumor Microvascular Endothelium to Ionizing Radiation

Inclusion Criteria: * Patients who are felt to have adequate tumor volume for these studies, at least a 2 x 2 x 2 cm3 tumor by physical exam, imaging studies or colonoscopy reports * Primary or recurrent tumors are eligible * Patients must be suitable candidates for surgery * Patients who have signed the informed consent Exclusion Criteria: * Patients who are not considered suitable candidates for surgery * Patients who have received prior radiation therapy to the tumor being removed * Patients who have received chemotherapy within 6 months of tumor removal * Patients who are pregnant * Patients may choose to be excluded at any time * Minors are excluded from this study because there are expected to be very few minors with the tumor types which the investigators are evaluating in this study