Reference | Numbers studied | Type of controls | Susceptibility | Severity | Ethnicity | |
---|---|---|---|---|---|---|
 | Cancer | Controls |  |  |  |  |
Smith KC et al, 2004 [57] | 141 | 261 | Bone marrow and solid organ donors – male and female | No association | No association | mixed |
Hefler LA et al, 2005 [58] | 269 | 227 | Women visiting outpatient dept for various reasons | No association | No association | Caucasian |
Our study | 703 | 489 | Women with normal mammograms from screening population | No association | No association | British Caucasian |