This phase II trial studies how well heated mitomycin and cisplatin during surgery work in
treating patients with stomach or gastroesophageal cancer. Drugs used in chemotherapy, such
as mitomycin and cisplatin, work in different ways to stop the growth of tumor cells, either
by killing the cells, by stopping them from dividing, or by stopping them from spreading.
Heating a chemotherapy solution and infusing it directly into the abdomen may kill more tumor