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Incidence of SPMs in different time periods among survivors of nasopharyngeal carcinoma
| Time | No. of patients suffered SPMs (%) (n=189) |
|---|---|
| Time post IMRT ≤ 1 yr | 27 (14.3) |
| 1 yr < time post IMRT ≤ 3 yr | 72 (38.1) |
| 3 yr < time post IMRT ≤ 5 yr | 64 (33.9) |
| Time post IMRT > 5 yr | 26 (13.7) |
SPM, second primary malignancy; IMRT, intensity-modulated radiotherapy treatment.
