In European populations, c.1100delC in CHEK2, one of the 11 genes recommended for genetic testing, is common to breast cancer patients in the UK (1.2–1.3%), Netherlands (2.5–3.8%), Finland (2.1–2.9%), Germany (0.33–1.1%), and Australia (0.68%) [67]. Here, CHEK2 is linked to breast cancer.