In a study of more than 14,000 women of African ancestry, a team led by Maureen Murphy from the Wistar Institute in Philadelphia, Pennsylvania, USA, and Christine Ambrosone from Roswell Park Cancer Institute in Buffalo, NY, USA, tested for an association between breast cancer and a rare genetic polymorphism in the TP53 gene that’s found almost exclusively in African-descent populations. This evidence concerns the gene TP53 and breast cancer.