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Table 2 Association of overall survival with the characteristics of 45 patients with RIOSM

From: Radiation-induced osteosarcoma of the maxilla and mandible after radiotherapy for nasopharyngeal carcinoma

Characteristic No. of patients Survival rate (%) P
1-year 2-year
Age (years)
 ≤49 21 52.4 42.9 0.676
 >49 24 54.2 29.2
Sex
 Women 12 41.7 33.3 0.572
 Men 33 57.6 36.4
Size (cm)
 ≤5 22 81.8 59.1 0.007
 >5 23 26.1 13.0
TNM stage
 I/II 19 52.6 36.8 0.159
 III/IV 26 53.8 34.6
Irradiation coursea
 Split 15 46.7 33.3 0.721
 Continuous 27 55.6 37.0
Radiation dose (Gy)
 ≤68 22 59.1 45.5 0.129
 >68 23 47.8 26.1
Latency period (years)
 ≤8.0 23 60.9 39.1 0.699
 >8.0 22 40.9 31.8
  1. aThree patients did not have available information