(ABCNEWS.GO) — Young women at high familial risk for breast cancer may see an even greater risk from diagnostic scans that expose them to chest radiation, including mammograms, researchers found.

Any diagnostic use of radiation before age 30 increased breast cancer risk by 90 percent for carriers of BRCA1 or BRCA2 mutations, according to a retrospective analysis of three nationwide cohorts in Europe by Flora E. van Leeuwen of the Netherlands Cancer Institute in Amsterdam, and colleagues.

A history of mammography before age 30 also tended to raise the risk by 43 percent, a finding that persisted with adjustment for family history as an indication, although without statistical significance, the group reported online in BMJ.

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