Translated from Spanish and reprinted with permission from Cancerología, Journal of the Instituto Nacional de Cancerología, Mexico. Cancerología 3(2008):19–27. Original available at: http://www.incan.org.mx/revistaincan/elementos/documentosPortada/1215566785.pdf ABSTRACT Clinical management of breast cancer, making a prognosis and deciding on treatment, currently depend on defining prognostic factors, especially hormone receptors (HR). In addition to confirming the heterogeneity of the disease, these […]