Twins with breast cancer exhibiting the same histopathological type and biological features

Abstract

We report identical female twins who had breast cancer exhibiting the same biological features. The elder twin developed a left breast mass. She was diagnosed with left breast cancer. An operation was performed, and on pathology, a mucinous carcinoma with nuclear grade 2, positive hormonal receptor, and low expression of HER2 protein was found. No sentinel lymph node metastases were detected. The younger twin also developed a left breast mass. She was also diagnosed with left breast cancer. An operation was performed, and on pathology, a mucinous carcinoma with the same biological features as the elder twin's was diagnosed.