|Number of first degree relatives||RR for women <50 years (95% CI)||RR for women ≥ 50 years (CI)|
|1||2.14 (1.92 to 2.38)||1.65 (1.53 to 1.78)|
|2||3.84 (2.37 to 6.22)||2.61 (2.03 to 3.34)|
|3||12.05 (1.70 to 85.16)||2.65 (1.29 to 5.46)|
Review: breast cancer is associated with a family history of the disease in first degree relatives
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