Breast cancer (BC) is primarily a disease of older or post menopausal women. It has been suggested that BC arising in young women is a unique biological subset characterized by less hormone sensitivity and higher HER2 (epidermal growth factor receptor) expression. This study was performed to compare the tumour biology between pre menopausal (PrM) and post menopausal (PoM) women.
New diagnosis of early BC from 2011-2015 in the South East Cancer Centre were included. The patients were divided into PrM (
Data from 497 patients were obtained. 235 (47.3%) were PrM and 262 (52.7%) were PoM. Age range PrM group vs PoM group (29-54 vs 55-91). The differences between the groups was statistically significant on pathology subtype (p = 0.003), T stage (p = 0.033), and N stage (p = 0.008). Ki67 and grade were not statistically significant. The mean ki67 across biology subtypes (ER/PR/HER2/Ki67) in the PrM group was higher. PrM group had more grade III disease (33.2% vs 30.9%). Table 1: Distribution of tumour biology according to menopausal status.