RRM reduced the risk of breast cancer by 80 per cent, and the probability of dying of breast cancer 15 years after risk-reducing mastectomy was less than one per cent, they said.

“Although there wasn’t a significant difference in deaths between the two groups in this study, we know that a risk reducing mastectomy significantly reduces the risk of ever developing breast cancer,” said Metcalfe.

Metcalfe noted that following these participants for an extended period would generate more evidence to assess the true mortality risk with precision and highlight the benefits associated with this type of surgery.

“Right now, we have good screening in place for breast cancer, including breast MRI, so surgery is only offered as an option, not a recommendation,” Metcalfe said.

“But with more studies being conducted to assess women’s trajectory and risk factors following RRM, we will know whether these guidelines need to be changed in the future,” she added.