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We evaluated whether ribonucleotide reductase regulatory subunit M1 (RRM1) protein expression by immunohistochemistry (IHC) is a predictor of survival and response in gemcitabine-treated, advanced non-small cell lung cancer (NSCLC). We retrospectively collected 40 formalin-fixed, paraffin-embedded NSCLC tissues to investigate the protein expression of RRM1 by IHC with a purified rabbit anti-human...