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Table 3 Available data on sibships with affected sisters

From: GENESIS: a French national resource to study the missing heritability of breast cancer

Number of sisters with breast cancer per sibship Number of sibships with
  Signed consent forms Completed questionnaires Blood samples Mammograms collected
at least 2a 696 678 669 362
   exactly 2a 616 600 592 324
   exactly 3a 69 67 67 34
   exactly 4a 10 10 9 4
   exactly 5a 1 1 1 0
  1. aWhether the women are index cases or affected sisters