• The largest study of breast cancer genes has uncovered 180 separate mutations
  • For 1 in 5 women, the family history written into their genes increases their risk
  • It has shed light on the BRCA1 gene, which Angelina Jolie famously inherited
  • Scientists say the danger for some women could be only half what they thought
  • The total contribution of genes to a breast cancer diagnosis is now around 18%

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