[A case of spindle cell carcinoma of the breast, in which irinotecan was effective against respiratory failure due to pulmonary metastases].

We present our experience with chemotherapy using irinotecan for lung metastases of spindle cell carcinoma of the breast. The patient is a 50-year-old female, who consulted our hospital due to a large breast tumor about 7 cm in diameter. Although computed tomography revealed invasion to the chest wall, no distant metastases were confirmed. Chemotherapy (FEC100 followed by paclitaxel) was not effective for down-staging. To improve her quality of life, standard radical mastectomy with combined partial resection of the chest wall was performed. The tumor was histologically diagnosed as spindle cell carcinoma. After the operation, multiple lung metastases appeared, and she had severe dyspnea. Thereafter irinotecan was administered. One week after the administration, metastatic lesions were reduced so that her dyspnea was remarkably relieved. The patient continued to receive irinotecan weekly until she died on the 49th day of treatment with irinotecan.