A case of granulocyte-colony stimulating factor producing gallbladder cancer

Ever since the identification of the colony-stimulating factor (CSF), granulocyte-CSF (G-CSF)-producing tumors have often been reported, and have been attracting attention, especially in pulmonary cancer. However, there have been only a small number of reports of G-CSF-producing tumors in cases of gastrointestinal cancer, and only four cases of G-CSF-producing gallbladder cancer have been reported so far. Recently, we encountered a 73-yr-old man with G-CSF-producing gallbladder cancer. The leukocyte count in the peripheral blood increased to the maximum of 75,200/mm³ during the course of observation, and mature neutrophils accounted for 97% (segmented forms: 89%, band forms: 8%). The serum G-CSF concentration was high (129 pg/ml). The leukocyte count became normalized postoperatively, and the serum G-CSF concentration also decreased (50 pg/ml). The tumor was diagnosed as undifferentiated adenocarcinoma of the pleomorphic type on the histopathologic examination. Numerous tumor cells were stained with the anti-G-CSF antibody. Detailed findings of the patient are presented here together with some discussion of the literature.