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Comparison among the gene expression profile and morphological characteristics of progression of breast ductal carcinoma. (a) Non-neoplastic tissue (20×). (b) Pure DCIS (10×). (c) DCIS-IDC (arrow; hand lens). (d) IDC (hand lens). DCIS, ductal carcinoma in situ; DCIS-IDC, ductal carcinoma in situ with co-existing invasive ductal carcinoma; IDC, invasive ductal carcinoma.
