In 2017, the UK Cancer Genetics Group (UKCGG) and UK Genetic Testing Network (UKGTN) held a workshop which led to a consensus for UK cancer gene panel testing.1 The agreed breast cancer panel included BRCA1, BRCA2, PALB2, ATM, CHEK2, PTEN, STK11 and TP53. This evidence concerns the gene ATM and breast cancer.