Table 3. Allele frequency distribution of polymorphic genetic variants by breast cancer status at follow-up.
| IGF1 genotype | All women (n=254) | No breast cancer (n=248) | Breast cancer (n=6) |
|---|---|---|---|
| (VNTR) | No. (%) | No. (%) | No. (%) |
| 12 | 3 (0.6%) | 2 (0.4%) | 1 (8.3%) |
| 13 | — | — | — |
| 14 | — | — | — |
| 15 | — | — | — |
| 16 | — | — | — |
| 17 | 8 (1.6%) | 8 (1.6%) | — |
| 18 | 32 (6.3%) | 32 (6.5%) | — |
| 19 | 333 (65.6%) | 330 (66.5%) | 3 (25.0%) |
| 20 | 91(17.9%) | 87 (17.5%) | 4 (33.3%) |
| 21 | 35 (6.9%) | 32 (6.5%) | 3 (25.0%) |
| 22 | 6 (1.2%) | 5 (1.0%) | 1 (8.3%) |
| IGF1 19-repeat allele | |||
| Absent | 33 (13.0%) | 29 (11.7%) | 4 (66.7%) |
| Present | 221 (87.0%) | 219 (88.3%) | 2 (33.3%) |
Genotype was missing for four women without breast cancer.