Research Article
Prognostic Factors and Treatment Results of High-Grade Osteosarcoma in Norway: A Scope Beyond the “Classical” Patient
Table 1
Characteristics of nonclassical and classical osteosarcoma (OS) patients, 1975–2009.
| | | Nonclassical OS patients (%) | Classical OS patients (%) | All patientsa (%) |
| | All patients | 221 (52) | 203 (48) | 424 (100) |
| | Gender | | | | | Female | 108 (49) | 70 (34) | 178 (42) | | Male | 113 (51) | 133 (66) | 246 (58) | | Axial versus extremity | | | | | Extremity | 106 (48) | 203 (100) | 309 (73) | | Axial | 115 (52) | 0 | 115 (27) | | Primary metastatic disease | | | | | No | 134 (61) | 203 (100) | 337 (80) | | Yes | 84 (39) | 0 | 84 (20) | | Age | | | | | ≤40 years | 94 (43) | 203 (100) | 297 (70) | | >40 years | 127 (57) | 0 | 127 (30) | | Tumour size | | | | | ≤10 cm | 84 (52) | 102 (56) | 186 (54) | | >10 cm | 78 (48) | 80 (44) | 158 (46) | | Duration of symptoms | | | | | ≤3 months | 86 (45) | 120 (62) | 206 (53) | | >3 months | 107 (55) | 73 (38) | 180 (47) | | Pathologic fracture | | | | | No | 187 (85) | 178 (88) | 365 (86) | | Yes | 34 (15) | 25 (12) | 59 (14) | | ALP | | | | | Normal | 62 (42) | 104 (68) | 166 (55) | | Elevated | 87 (58) | 48 (32) | 135 (45) | | LDH | | | | | Normal | 73 (51) | 87 (61) | 160 (56) | | Elevated | 70 (49) | 56 (39) | 126 (44) | | Histology | | | | | Osteoblastic | 97 (44) | 94 (47) | 191 (46) | | Chondroblastic | 30 (14) | 25 (13) | 55 (13) | | Fibroblastic | 20 (9) | 21 (11) | 41 (10) | | Other | 73 (33) | 59 (30) | 132 (32) |
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Missing values equal the difference between the summarized number from each subgroup in the fourth column and the total patients in the study.
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