Although haplotype studies and Brazilian colonization history have indicated a common Portuguese ancestor as an explanation for the higher concentration of TP53 p.R337H carriers in the Southeastern region of the country [17,18], the largest Brazilian BC genotyping study, which included 1663 BC patients unselected by age at BC onset or family history of cancer, mostly from the South/Southeast of Brazil (70%), had a detection rate of p.R337H carriers of 1.6% [19]. Here, TP53 is linked to breast cancer.