| Summary: | Pleomorphic carcinoma (PC) is a rare malignant lung tumor with a poorer prognosis compared to other histological types of non-small cell lung cancer. However, several recent immunohistochemical studies revealed that a low MIB-1 index is a good prognostic marker in patients with PC. We report the case of a patient with PC and a single brain metastasis that achieved long-term recurrence-free survival following treatment with combined modality therapy. In this case, the MIB-1 index was reduced by gemcitabine-based chemotherapy, which may have led to long-term disease-free survival. The MIB-1 index may be a useful biomarker for the response to chemotherapy.
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