| Type of cancer | Firs-degree relative (n) | % | Second-degree relative (n) | % |
| Gastric | 124 | 22.5% | 63 | 19.3% |
| Breast | 57 | 10.3% | 26 | 8.0% |
| Prostate | 49 | 8.9% | 15 | 4.6% |
| Colorectal | 41 | 7.4% | 22 | 6.7% |
| Head and Neck1 | 39 | 7.1% | 41 | 12.5% |
| Lung | 33 | 6.0% | 18 | 5.5% |
| Cervical | 29 | 5.3% | 19 | 5.8% |
| Esophageal | 24 | 4.4% | 5 | 1.5% |
| Hematological | 27 | 4.9% | 5 | 1.5% |
| Liver | 16 | 2.9% | 6 | 1.8% |
| Skin | 13 | 2.4% | 12 | 3.7% |
| 2 types of cancer2 | 12 | 2.2% | 1 | 0.3% |
| CNS | 12 | 2.2% | 10 | 3.1% |
| Gallbladder | 8 | 1.5% | 1 | 0.3% |
| Pancreas | 8 | 1.5% | 1 | 0.3% |
| Bone | 8 | 15% | 6 | 1.8% |
| Kidney | 8 | 1.5% | 1 | 0.3% |
| Penis | 3 | 0.5% | 1 | 0.3% |
| Vagina | 3 | 0.5% | 0 | 0.0% |
| Bladder | 2 | 0.4% | 2 | 0.6% |
| Testicle | 2 | 0.4% | 0 | 0.0% |
| Ovary | 1 | 0.2% | 3 | 0.9% |
| Vulva | 1 | 0.2% | 1 | 0.3% |
| Spleen | 0 | 0.0% | 1 | 0.3% |
| Unknown site | 31 | 5.6% | 67 | 20.5% |
| Total | 551 | 100% | 327 | 100% |