Table I.
Results of univariate analysis.
| Factors | Patient no. (%)(n=25) | Median OS (months) | 5-year OS (%) | Log-rank P-value |
|---|---|---|---|---|
| Age (years) | ||||
| <20 | 10 (40) | Unreached | 58 | 0.064 |
| ≥20 | 15 | (60) | 23.2 | 14 |
| Gender | ||||
| Male | 18 (72) | 25 | 21.6 | 0.35 |
| Female | 7 (28) | 33.3 | 43 | |
| Histological subtype | ||||
| Chondroblastic | 8 (32) | 13.4 | 13 | 0.015 |
| Other | 17 (68) | 33.3 | 37 | |
| Tumor necrosis | ||||
| <90% | 17 (68) | 23.2 | 8 | 0.011 |
| ≥90% | 6 (24) | Unreached | 69 | 69 |
| ND | 2 (8) | |||
| RFI (months) | ||||
| <12 | 11 (44) | 24.6 | 30 | 0.74 |
| ≥12 | 14 (56) | 29 | 27 | |
| Peri-PM chemotherapy | ||||
| Yes | 20(80) | Unreached | 63 | 0.13 |
| No | 5 (20) | 24.6 | 19 | |
| Number of nodules | ||||
| <3 | 12 (48) | 25 | 27 | 0.85 |
| ≥3 | 13 (52) | 24.8 | 29 | |
| Laterality | ||||
| Unilateral | 13 (52) | 25 | 33 | 0.58 |
| Bilateral | 12 (48) | 29 | 26 | |
| Size (cm) | ||||
| <3 | 11 (44) | 32 | 36 | 0.91 |
| ≥3 | 11 (44) | 24 | 30 | |
| ND | 3 (12) | |||
| Metastasis during CTX | ||||
| Yes | 3 (12) | 11.0 | 0 | <0.0001 |
| No | 22 (88) | 29.0 | 33 | |
| Detection of metastasis | ||||
| At initial diagnosis | 5 (20) | 32.0 | 40 | 0.43 |
| At recurrence | 20 (80) | 24.8 | 27 | |
| Status of resection margins | ||||
| R0 | 19 (76) | 25 | 38 | 0.36 |
| R1 | 6 (24) | 29 | 0 | |
| Visceral pleural involvement | ||||
| Yes | 5 (20) | 13.1 | 0 | 0.007 |
| No | 20 (80) | 32 | 39 |
OS, overall survival; ND, no data; RFI, relapse-free interval; PM, pulmonary metastasectomy; CTX, chemotherapy.