Luminal breast cancer heterogeneity among women of different reproductive state

Abstract

The conducted research included 850 patients with breast cancer, treated in the FSBD «RNIOI» Ministry of Health RF in the period 2010-2013. Among them 649 had luminal tumors. According to our results their nature depend on menstrual state. The proprtion of the hormone-positive tumors prevails in all groups (p<0,05). In general, 76,4% against 23,6%. This is particularly evident in the group of menstruating women (79,8% against 20,2%). Luminal B subtype is the most common regardless menstrual state (59,9%). It’s also most expressed in the group of menstruating women, too (67,5%). However, the high level incidence of luminal B subtype in this group, unlike in perimenopausal women, is supported by higher level of Her2-neu overexpression or amplification associated with positive receptors (48,6% against 35,7%). In perimenopause, the level of luminal B is slightly lower than luminal A (55,9%). And in postmenopause it becomes higher again (58,1%), but due to the higher proliferative activity of tumors.

Keywords

breast cancer / biomolecular subtypes / luminal tumors / reproductive state

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