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| Malignant tumor | Second primary cancer N(ratio) |
|---|---|
| Digestive system tumor | 56(36.8%) |
| Breast cancer | 12(7.9%) |
| Head-neck cancer | 13(8.6%) |
| Urinary system tumor | 8(5.3%) |
| Gynecological tumors | 15(9.9%) |
| Lung cancer | 28(18.4%) |
| Leukemia/lymphoma | 20(13.2%) |
