Microinvasive carcinoma of the breast.

Microinvasive breast carcinoma is a diagnostically subtle form of invasive breast carcinoma with poorly characterized biologic behavior and limited evidence to guide treatment. This review addresses: (i) diagnostic criteria for microinvasive breast carcinoma; (ii) epidemiology and clinical features; (iii) histopathologic findings, including practical diagnostic clues and use of immunohistochemistry; (iv) biomarker assessment; and (v) current clinical management strategies and challenges.