Table 2.

Multivariate analysis on potential prognostic factors for childhood CCSK.

Variables	HR (95% CI)	P-value
Sex
Female	1 (Ref)	–
Male	0.47 (0.14–1.65)	0.240
Tumor size
<10 cm	1 (Ref)	–
10–15 cm	3.35 (0.42–26.98)	0.256
≥15cm	12.33 (1.4–108.79)	0.024
Age at diagnosis
≤ 2 years	1 (Ref)	–
>2 years	0.71 (0.21–2.35)	0.573
Year of diagnosis
<1994	1 (Ref)	–
≥1994	0.24 (0.06–0.94)	0.041
Distant metastases
No	1 (Ref)	–
Yes	5.94 (1.49–23.63)	0.012
Radical nephrectomy
No	1 (Ref)	–
Yes	3.61 (0.93–14.07)	0.064

CCSK, clear cell sarcoma of kidney; HR, hazard ratio; CI, confidence interval.

Data source: Incidence - SEER 18 Regs Custom Data (with additional treatment fields), Nov 2018 Sub (1975–2016 varying).