Debulking and Chemotherapy With or Without Intraperitoneal Chemotherapy to Treat Peritoneal Carcinomatosis

"Patients will undergo a laparotomy, surgical incision in the abdomen to assess the peritoneal cavity with cytoreductive surgery or tumor debulking, to reduce tumor size.~Drug: Post operative chemotherapy: systemic oxaliplatin 85 mg/m\^2 on day 1 only, leucovorin 200 mg/M\^2/day on day 1, 2, 15, and 16, and infusional 5-flurouracil (5-FU) 800 mg/m\^2 on day 8, every other week of every four weeks (two weeks per month) starting 4 to 6 weeks after operation and continuing for four cycles { 16 weeks total}."

"Patients will undergo a laparotomy, surgical incision in the abdomen to assess the peritoneal cavity with cytoreductive surgery or tumor debulking, to reduce tumor size.~Followed by continuous hyperthermic peritoneal perfusion (HIPEC) with 250 mg/m\^2 cisplatin. Post operative dwell chemotherapy given once between post op day 7 and 12: 5-fluororacil (5-FU) 800 mg/m\^2 and paclitaxel 125 mg/m\^2.~Drug: Post operative chemotherapy: systemic oxaliplatin 85 mg/m\^2 on day 1 only, leucovorin 200 mg/M\^2/day on day 1, 2, 15, and 16, and infusional 5-flurouracil (5-FU) 800 mg/m\^2 on day 8, every other week of every four weeks (two weeks per month) starting 4 to 6 weeks after operation and continuing for four cycles { 16 weeks total}."