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QUESTION: In women with a family history of breast cancer, how does the pattern of breast cancer in first degree relatives affect the risk of developing the disease?
Studies were identified by searching computerised literature databases, reviewing bibliographies of review articles, and contacting experts in the field.
Studies were selected if they were cohort or nested case control studies, included ≥100 women with incident invasive breast cancer, and information about reproductive or hormonal factors was sought on each woman.
Principal investigators of the included studies were contacted for data on each woman regarding whether any of her first degree female relatives (mother, sisters, or daughters) had been diagnosed with breast cancer and, if so, their age when the diagnosis was made. Data were also collected on the numbers of …
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