Table 3.

Multivariate Cox proportional hazards analysis (n =54).

Variable	Disease-free survival
	HR (95% CI)	P-value
Age (≥60 versus <60)	1.324 (0.595–2.948)	0.491
Gender (male versus female)	0.815 (0.285–2.335)	0.704
Stage (Ta versus T1)	0.704 (0.328–1.514)	0.370
Size (≥3 cm versus <3 cm)	1.859 (0.853–4.053)	0.119
Grade (LG versus HG)	1.010 (0.464–2.201)	0.980
mTBI (≥0.85 versus <0.85%)※	2.228 (1.095–4.531)	0.027*

^※mTBI, molecular tumor burden index.

^*P ≤ 0.05 considered statistically significant.