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Expression of CLDN4 and CLDN1 in invasive ductal carcinomas. An immunohistochemical evaluation to identify CLDN4 (A, C) and CLDN1 (B, D) at the cytoplasmic membrane of cancer cells using anti–CLDN4 antibody, 4D3 and anti–CLDN1 antibody, 2C1, respectively. A, B, Solid‐tubular type, nuclear grade (NG) 2, pT1N0, stage 1, luminal subtype. C, D, Scirrhous type, NG3, pT2N1, stage 2 and triple negative subtype. Bar, 100 μm
