Abstract
Recommended principles for the choice of therapies in operable breast cancer include the recognition of diverse subtypes of breast cancer and, based on genetic signature and immunohistochemistry, the identification of targets and related factors predictive of response. We review recent developments in the knowledge of established predictive factors in the neo-adjuvant setting. Experimental and clinical studies have shown that the degree of expression of estrogen receptor (ER) and progesterone receptor (PgR) of the primary tumor defines distinct biological entities that require a differentiated approach to neoadjuvant treatment and clinical trial investigation. In particular, tumors that express high levels of both steroid hormone receptors in a majority of cells derive no or low benefit from preoperative chemotherapy, while the absence of expression of ER and PgR was significantly correlated with the probability of pathologic complete remission (pCR). It was also demonstrated that the pCR rate to primary chemotherapy is significantly lower in invasive lobular carcinoma, frequently characterized by a high expression of steroid hormone receptors, if compared with the ductal histotype. Direct or indirect measures of high cell prol...Continue Reading
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