Received prior radiotherapy to any portion of the abdominal cavity or pelvis Patients who are not candidates for major abdominal surgery due to known medical comorbidities Prior intra-abdominal surgery within weeks of trial enrollment. Patients with extra-abdominal metastatic disease Patients who have had prior abdominal radiotherapy Subjects who have received prior radiotherapy to any portion of the abdominal cavity or pelvis are excluded Prior radiation to the liver or other upper abdominal regions Known or suspected extensive abdominal adhesions Prior radiotherapy to any portion of the abdominal cavity or pelvis Patients must be reasonable candidates for laparoscopy and IP platinum regimen with no prior evidence of clinically significant intra-abdominal adhesions, persistent abdominal wall infections, renal toxicity, or bowel obstruction Prior abdominal radiotherapy Prior history of abdominal radiation therapy Patients with prior radiation to the abdominal cavity or pelvis are excluded Subjects received previous abdominal radiation Intra-abdominal disease > cm in diameter at the time of registration, intrahepatic disease, or disease beyond the abdominal cavity; patients with intra-abdominal lymph node involvement are eligible based on biodistribution data indicating viral dissemination to lymph nodes following intraperitoneal administration Prior history of abdominal radiation therapy No prior abdominal radiation Primary or recurrent retroperitoneal or abdominal tumor Radiologic workup must demonstrate that the disease is confined to the abdominal cavity and/or is not metabolically active on PET (positron emission tomography scan), outside of the abdominal cavity Patients will be ineligible if they have disease outside of the abdominal cavity which is uncontrolled or PET avid Recent (i.e., ? weeks) history of abdominal surgery or peritonitis Received prior radiotherapy to any portion of the abdominal cavity or pelvis. Received prior chemotherapy for any abdominal or pelvic tumor. Patients who have received prior radiotherapy to any portion of the abdominal cavity or pelvis are excluded Subject with an active abdominal or pelvic infection at the operation site. Patient must be eligible for abdominal surgery Emergency surgery for abdominal indications Radiologic workup must demonstrate that the disease is confined to the abdominal cavity and/or is controlled outside of the abdominal cavity Patients will be ineligible if they have disease outside of the abdominal cavity which is uncontrolled Patients who have had prior abdominal radiotherapy Patients with prior abdominal surgery within days prior to entering the study Patients with liver metastases cannot have received prior upper abdominal radiation Patients who have received previous abdominal radiation Patients who have had prior abdominal radiotherapy Recurrent and/or metastatic resectable colorectal cancer, including disease within the abdomen and pelvis with no evidence of extra-abdominal metastases; intra-abdominal disease includes: isolated hepatic metastasis/metastases (see next inclusion criteria point), isolated peritoneal metastasis, or a combination of hepatic and extrahepatic metastasis Prior abdominal radiotherapy Large pelvic or intra-abdominal masses History of abdominal surgery precluding free flap donor site Patients undergoing anterior abdominal wall hernia repairs Prior abdominal or pelvic RT Physiologic suitability for major abdominal surgery Pfannenstiel or transverse abdominal incision Patients with prior abdominal or pelvic surgery Major abdominal or pelvic surgery within the past months