Immunophenotype and evolution of breast carcinomas: a comparison between very young and postmenopausal women

PURPOSE: the objective of this study was to evaluate the clinical, pathological and molecular characteristics in very young women and postmenopausal women with breast cancer. METHODS: we selected 106 cases of breast cancer of very young women (<= 35 years) and 130 cases of postmenopausal women. We evaluated clinical characteristics of patients (age at diagnosis, ethnic group, family history of breast cancer, staging, presence of distant metastases, overall and disease-free survival), pathological characteristics of tumors (tumor size, histological type and grade, axillary lymph nodes status) and expression of molecular markers (hormone receptors, HER2, p53, p63, cytokeratins 5 and 14, and EGFR), using immunohistochemistry and tissue microarray. RESULTS: when comparing clinicopathologic variables between the age groups, younger women demonstrated greater frequency of nulliparity (p=0.03), larger tumors (p=0.000), higher stage disease (p=0.01), lymph node positivity (p=0.001), and higher grade tumors (p=0.004). Most of the young patients received chemotherapy (90.8%) and radiotherapy (85.2%) and less tamoxifen therapy (31.5%) comparing with postmenopausal women. Lower estrogen receptor positivity 49.1% (p=0.01) and higher