“…In line with the established associations for the general population, breast feeding for at least 1 year has been found to be protective (RR: 0.50-0.68) (Jernstrom et al 2004, Andrieu et al 2006, Gronwald et al 2006a, Kotsopoulos et al 2012a, as has later age at menarche (Chang-Claude et al 2007, Kotsopoulos et al 2005, 2012a, (RR: 0.91 per year; Kotsopoulos et al 2012a). Later age at first fullterm pregnancy has also consistently been reported to be associated with reduced risk of breast cancer for BRCA1 mutation carriers (Andrieu et al 2006, Milne et al 2010b, Lecarpentier et al 2012 (RR: 0.65 for age ≥30 years vs <30 years; Friebel et al 2014), which is in contrast to what is known about the association with risk for overall breast cancer in the general population.…”