You are consulted by the emergency department about a patient with a large bowel obstruction caused by an obstructing right colonic mass. On exploration, you note that she has peritoneal carcinomatosis in the right lower quadrant, with a normal-appearing liver and ovaries. You perform a right colectomy with primary anastomosis, and a biopsy of her metastatic disease. Final pathology report is consistent with metastatic appendiceal mucinous neoplasm. Staging shows no evidence of distant metastatic disease aside from her known isolated peritoneal lesions. What is the best treatment option to improve her overall survival?