Table 1.
Baseline demographic and clinicopathologic characteristics
| Characteristic | Dedifferentiated chondrosarcoma (n = 185) | Osteosarcoma (n = 2261) | p value |
| Sex | |||
| Male | 57 (106) | 55 (1252) | 0.65 |
| Racea | < 0.001 | ||
| White or unknown | 94 (173) | 75 (1703) | |
| Black | 2 (4) | 15 (331) | |
| Other (Native American, Alaska native, Asian, Pacific Islander) | 4 (8) | 10 (227) | |
| Age in years | < 0.001 | ||
| Median (range) | 66 (18-95) | 17 (3-91) | |
| 0-66 | 51 (94) | ||
| > 66 | 49 (91) | ||
| 0-17 | 52 (1179) | ||
| > 17 | 48 (1082) | ||
| Size in mm | 0.280 | ||
| Median (range) | 90 (7-420) | 90 (4-888) | |
| ≤ 8 cm | 36 (67) | 35 (781) | |
| > 8 cm | 50 (92) | 47 (1056) | |
| Missing | 14 (26) | 19 (424) | |
| SEER stage | 0.053 | ||
| Local | 36 (67) | 44 (988) | |
| Regional | 64 (118) | 56 (1273) | |
| Tumor grade | 0.002 | ||
| I and II | 10 (19) | 6 (141) | |
| III and IV | 78 (144) | 73 (1641) | |
| Missing | 12 (22) | 21 (479) | |
| Primary tumor location | < 0.001 | ||
| Extremities | 72 (134) | 89 (2008) | |
| Trunk or bone, NOS | 28 (51) | 11 (253) | |
| Subtype | N/A | ||
| Osteosarcoma, NOS | 68 (1541) | ||
| Chondroblastic osteosarcoma | 16 (356) | ||
| Fibroblastic osteosarcoma | 6 (129) | ||
| Telangiectatic osteosarcoma | 4 (95) | ||
| Osteosarcoma in Paget disease of bone | 1 (16) | ||
| Small cell osteosarcoma | 1 (18) | ||
| Central osteosarcoma | 4 (92) | ||
| High-grade surface osteosarcoma | 1 (14) | ||
| Radiation | < 0.001 | ||
| No/unknown | 80 (148) | 96 (2160) | |
| Yes | 20 (37) | 4 (101) | |
| Chemotherapy | < 0.001 | ||
| No/unknown | 68 (125) | 11 (259) | |
| Yes | 32 (60) | 89 (2002) |
Data presented as % (n), unless otherwise indicated.
a
Self-reported; NOS = not otherwise specified.