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Tumors: Breast

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Encyclopedia of Gerontology and Population Aging

Definition

Breast cancer is a type of cancer that develops from breast tissue (National Cancer Institute 2012). Breast cancer can be separated roughly into three main groups or phenotypes: (i) estrogen receptors (ER) and/or progesterone receptors (PgR) positive (ER+/PgR+) (~75%), or so-called luminal; (ii) human epidermal growth factor receptor 2 overexpressed (HER2+) (~15%), whether ER/PgR+ or ER/PgR−; and (iii) ER−, PgR−, and HER2− (~10%), or so-called triple-negative or basal-like.

Overview

Breast cancer is the most frequent cancer among women in developed countries (Henley et al. 2020). Increasing age is the main risk factor for breast cancer, of which about 40% are diagnosed after 65 years (Biganzoli et al. 2012). However, older women are underrepresented in breast cancer clinical trials (Hurria et al. 2014), making standard management often poorly evidence-based and established wrongly on extrapolations of results obtained in younger ones.

In older women aged 80 years and older,...

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Geiss, R., Gattas-Vernaglia, I., Brain, E. (2020). Tumors: Breast. In: Gu, D., Dupre, M. (eds) Encyclopedia of Gerontology and Population Aging. Springer, Cham. https://doi.org/10.1007/978-3-319-69892-2_774-1

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