[A Case of Granulocyte-Colony Stimulating Factor Producing Ascending Colon Cancer].

A 59-year-old man with chief complaints of right-sided rib pain and fever was admitted to our hospital. A type 2 tumor in the ascending colon was revealed by total colonoscopy. Computed tomography examination revealed multiple tumors in the liver. The white blood cell count was high as 13,740/μL. Chemotherapy was planned after treatment with antibiotics, but it was not successful. Right colectomy was performed for infection control. mFOLFOX6 therapy was performed, but liver metastases progressed rapidly, and he died on the 39th postoperative day. The immunohistochemistry revealed G-CSF producing colon cancer. G-CSF producing colon cancer progresses rapidly with poor prognosis. It is necessary to think carefully about indication of surgery and chemotherapy.