Clinical characteristics of Poland's syndrome associated with breast cancer: Two case reports and a literature review.

Poland's syndrome is a rare congenital malformation that is characterized by a congenital defect of the pectoralis major. It is associated with various ipsilateral upper extremity anomalies and homolateral breast hypoplasia. There have been reports of Poland's syndrome being associated with different malignancies. Here, we report two cases of Poland's syndrome associated with breast cancer (BC) and review the literature. To date, 21 cases (including our two cases) of Poland's syndrome associated with BC have been reported. The clinical characteristics of the disease are analyzed in this report.