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Immunohistochemical analysis of NSCLC and adjacent tissues for PCNA expression. ∗∗P < .05. Weak PCNA expression in adjacent tissues at 100× (A) and 400× (B) magnification. Strong PCNA expression in NSCLC tissues at 100× (C) and 400× (D). The expression rates of PCNA protein in NSCLC and adjacent tissues (E). NSCLC = non-small cell lung cancer, PCNA = proliferating cell nuclear antigen.
