Table 3.
Baseline clinical characteristics of patients diagnosed as osteosarcoma with DM.
| Training group (n = 154) | Validation group (n = 106) | χ2 | P | |
|---|---|---|---|---|
| Age, years | 7.178 | 0.066 | ||
| ≤18 | 100 | 54 | ||
| 19–30 | 22 | 18 | ||
| 31–49 | 6 | 11 | ||
| ≥50 | 26 | 23 | ||
| Sex | 1.664 | 0.197 | ||
| Male | 91 | 71 | ||
| Female | 63 | 35 | ||
| Race | 1.968 | 0.374 | ||
| Black | 22 | 21 | ||
| Other | 10 | 9 | ||
| White | 122 | 76 | ||
| Primary site | 3.557 | 0.169 | ||
| Axial | 13 | 17 | ||
| Limb | 135 | 85 | ||
| Other | 6 | 4 | ||
| Grade | 0.245 | 0.621 | ||
| I–II | 4 | 1 | ||
| III–IV | 150 | 105 | ||
| Histological type | 8.534 | 0.171 | ||
| 9180 | 110 | 83 | ||
| 9181 | 22 | 14 | ||
| 9182 | 2 | 5 | ||
| 9183 | 7 | 1 | ||
| 9184 | 2 | 0 | ||
| 9185 | 3 | 1 | ||
| Other | 8 | 2 | ||
| T | 1.500 | 0.472 | ||
| T1 | 39 | 23 | ||
| T2 | 103 | 79 | ||
| T3 | 12 | 4 | ||
| N | 0.005 | 0.942 | ||
| N0 | 142 | 98 | ||
| N1 | 12 | 8 | ||
| Tumor size | 1.279 | 0.528 | ||
| <50 | 8 | 6 | ||
| 50–100 | 63 | 35 | ||
| >100 | 83 | 65 | ||
| Surgery | 128 | 78 | 3.467 | 0.063 |
| Radiotherapy | 27 | 21 | 0.217 | 0.642 |
| Chemotherapy | 142 | 98 | 0.005 | 0.942 |
9180, Osteosarcoma, NOS; 9181, Chondroblastic osteosarcoma; 9182, Fibroblastic osteosarcoma; 9183, Telangiectatic osteosarcoma; 9184, Osteosarcoma in Paget disease of bone; 9185, Small cell osteosarcoma.