Abstract
Bone is one of the most common sites of distant metastasis for breast carcinomas. In this study, our objective is to identify molecular markers and molecular subtypes that may predict patients at higher risk of developing bone metastasis. Immunohistochemical analysis with antibodies against estrogen receptor alpha, progesterone receptor, androgen receptor, Her2/neu, epidermal growth factor receptor, CK5/6, CK14, CK17, CK8, and CK18 was performed on representative sections of 21 breast carcinomas with bone metastasis and 94 cases without bone metastasis. The expression rates of receptors, subtype distributions (basal versus nonbasal) of 3 molecular classifications (cytokeratin, triple negative, and cytokeratin/triple negative), and 5 subtypes of cytokeratin/triple negative classification were compared between these 2 groups. We found that (1) the breast cancers with bone metastasis were associated with a significant percentage of estrogen receptor-positive/progesterone receptor-negative tumors compared with tumors without bone metastasis (38% versus 6%, P < .0001). (2) There was significant difference on estrogen receptor expression between high grade and non-high grade in tumors with or without bone metastasis (P = .0084 and 1....Continue Reading
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