CK7/CK20 expression patterns are not exclusive to either breast or gastrointestinal origin, and false-negative results may arise when biopsy specimens are small or superficial—especially in the setting of submucosal infiltration.14) GATA3, while commonly positive in breast carcinoma, has also been reported in non-breast tumors.15) Therefore, immunohistochemical results must be interpreted in the context of clinical history, imaging findings, and morphological features, rather than relied upon solely. Here, KRT7 is linked to breast carcinoma.