Table 2. C-indices of predicting models with or without BSI.

Study ID	C-index (95% CI) including BSI	Baseline c-index	ΔC-index	Survival outcome
Reza et al. 2014	0.83	0.77	0.06	OS
Anand et al. 2016	0.72	0.67	0.05	OS
Miyoshi et al. 2016	0.811	0.751	0.06	OS
Mitsui et al. 2012	0.66	0.621	0.039	OS
Miyoshi et al. 2016 (2)	0.792	0.721	0.071	OS
Lindgren et al. 2017	0.68	NR		OS
Reza et al. 2016 (1)	0.661	NR		OS
Poulsen et al. 2015	0.95 (0.81–1.0)	0.76 (0.39–1.0)	0.19	CSS
Ulmert et al. 2012	0.825 (0.754–0.881)	0.768 (0.702–0.837)	0.057	CSS

NR: not reported; OS: Overall Survival; CSS: Cancer specific survival.