“…In this study, in accordance with the literature data, we observed PCNA positive reactions in the brown color in the nucleus of tumor cells (13,24). In addition, similar to previous studies, we detected PCNA expressions in the cytoplasm of cells undergoing mitosis (19,22,23,25). Similar to the study conducted by Ilhan et al 2008 (24), we did not detect any PCNA positive reaction in normal mammary glands.…”