BRCA1 and breast cancer: The deletion of exons 4–6 of BRCA1 (in the literature also referred to as BRCA1 del exons 5–7) detected for a single White non-Afrikaner BC patient is rare, as it has been detected only six times previously, mostly in European countries, namely Germany [25], Croatia [36], Italy [37], Slovenia [38], Spain [39] and Denmark [40].