Register With Patients in Which Hyperthermic Intra-Peritoneal Chemotherapy (HIPEC) Was Performed

This is a registry study following patients who have undergone a procedure called HIPEC — where heated chemotherapy is delivered directly into the abdominal cavity during surgery — to treat cancers that have spread to the lining of the abdomen, in order to track outcomes and improve this specialized treatment. **You may be eligible if...** - You have been diagnosed with one of the following conditions that has spread to the lining of the abdomen: colorectal (bowel) cancer, pseudomyxoma peritonei (a slow-growing mucus-producing condition in the abdomen), or peritoneal mesothelioma (cancer of the abdominal lining) - You are planned to undergo or have undergone surgery plus HIPEC treatment **You may NOT be eligible if...** - You have a different type of cancer not listed above - You have not undergone or are not planned to undergo the HIPEC procedure Talk to your doctor to see if this trial is right for you.