A case of liver and bone metastases after complete resection of gastric GIST effectively treated with radiotherapy and imatinib mesylate

A 70's man was admitted to our hospital because of lumbago and paresthesia in the right lower extremity. He underwent surgical resection of gastric gastrointestinal stromal tumor (GIST), which was classified to the high-risk group according to the modified-Fletcher's classification, one and half years ago. CT, MRI, and PET-CT showed metastases to a part of the liver (S3-4), the 12th thoracic vertebra, and the sacral bone. Subsequently, radiotherapy for the bone metastasis and administration of imatinib mesylate were started. Four months after the initial admission, the liver and the bone metastatic lesions achieved PET-complete response (CR). This report shows that multimodality therapy with radiotherapy and imatinib mesylate was effective for liver and bone metastases after complete resection of gastric GIST.