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 |