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Basic Study
Copyright: ©Author(s) 2026.
World J Clin Oncol. May 24, 2026; 17(5): 119275
Published online May 24, 2026. doi: 10.5306/wjco.v17.i5.119275
Table 1 Characteristics of study subjects, mean ± SD/n (%)
VariablesDiscovery cohort (n = 77)
Validation cohort (n = 137)
OS (n = 28)
NHS (n = 49)
OS (n = 49)
OC (n = 39)
NC (n = 49)
Age (year)32.18 ± 19.3140.09 ± 12.7924.63 ± 14.8418.77 ± 14.3824.82 ± 11.47
Gender
    Male17 (60.71)22 (44.90)32 (65.31)23 (58.97)32 (65.31)
    Female11 (39.29)27 (55.10)17 (34.69)16 (41.03)17 (34.69)
Anatomic site
    Left femur7 (25.00)14 (28.57)
    Right femur5 (17.86)12 (24.49)
    Left tibia3 (10.71)4 (8.16)
    Right tibia5 (17.86)11 (22.45)
    Right humerus2 (7.14)3 (6.12)
    Others6 (21.43)5 (10.20)
Histologic type
    Osteoblastic5 (17.86)8 (16.33)
    Fibroblastic3 (10.71)4 (8.16)
    Chondroblastic4 (14.29)8 (16.33)
    Small cell OS3 (10.71)6 (12.24)
    Others4 (14.29)7 (14.29)
    Unknown9 (32.17)16 (32.65)
TNM
    IA12 (42.86)25 (51.02)
    IB3 (10.71)13 (26.53)
    IIA1 (3.57)3 (6.12)
    IIB1 (3.57)3 (6.12)
    IV11 (39.29)1 (2.04)
    Unknown0 (0.00)4 (8.16)
Tumor size
    < 5 cm8 (28.57)10 (20.41)
    ≥ 5 cm16 (57.14)35 (71.43)
    Unknown4 (14.29)4 (8.16)
Distant metastasis
    No17 (60.71)48 (97.96)
    Yes11 (39.29)1 (2.04)


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