[A Case of Rectal Gastrointestinal Stromal Tumor(GIST)with Long-Term Survival Treated with Multidisciplinary Therapy]

We report a case of gastrointestinal stromal tumor(GIST)with long-term survival treated by multidisciplinary therapy, including surgery and imatinib to prevent repeated recurrence. A 76-year-old woman visited our hospital with difficulty in defecation and bloody bowel discharge. She was diagnosed with rectal GIST and underwent transanal partial resection of the rectum. Local recurrence occurred 1 year after the operation, and the tumor was resected transanally. Hepatic metastasis occurred 8 months after the second operation. The patient was administered imatinib for 2 months, which caused the tumor to shrink, and extended left lobectomy was performed. Imatinib was administered for 2 years after hepatectomy. After another 2 years, metastasis to the liver and thoracic and lumbar vertebrae occurred. The recurrent tumors reverted to cystic lesions after 6 months of imatinib treatment. She has been alive without tumor progression during re-treatment with imatinib for 7 years(13 years after the first surgery).