PGR and breast cancer: A total of 68 studies focused on predicting Lifetime breast cancer risk, while other outcomes included: 5-year breast cancer risk (n = 19), 10-year breast cancer risk (n = 17), short-term risk, meaning risk of diagnosis within the following three years or less (n = 6), overall risk by a certain age cut-off, for example risk of diagnosis by e.g. age 50 (n = 3), oestrogen- and progesterone-receptor (ER and PR) positive breast cancer risk (n = 2) and contralateral cancer risk (n = 1), with several studies assessing more than one outcome.