Approximately 390 men are diagnosed with MBC in the UK each year (CancerResearchUK 2017). MBC displays similarities to FBC, namely late onset, post-menopausal, oestrogen receptor/progesterone receptor-positive FBC (Silvestri et al 2016). However, many characteristics of MBC do not overlap with FBC, which could be the reason why the rates of the two diseases, for mortality and survival have not improved (Rizzolo et al 2013).