CT imaging features associated with recurrence in non-small cell lung cancer patients after stereotactic body radiotherapy

Table 3 Harrell’s C-index for prognostic models of OS, RFS and LR-RFS

	Models	Features	Harrell’s C index
			Point	95% CI
			Point	Lower	Upper
OS	Clinical features	T-stage & ECOG^a	0.64	0.54	0.74
	Imaging features	Vascular involvement, lymphadenopathy, F13^a	0.76	0.67	0.84
	Clinic & imaging features	ECOG, vascular involvement, lymphadenopathy, PC1	0.78	0.71	0.86
RFS	Clinical feature	T-stage	0.61	0.54	0.68
	Imaging features	Vascular involvement, vascular attachment, pleural retraction, lymphadenopathy, relative enhancement	0.77	0.70	0.84
	Clinic & imaging features	Vascular involvement, vascular attachment, pleural retraction, lymphadenopathy, relative enhancement	0.77	0.70	0.84
LR-RFS	Clinical features	T-stage & ECOG^a	0.62	0.54	0.70
	Imaging features	Vascular involvement, lymphadenopathy, F13^a, F92^a	0.78	0.71	0.85
	Clinic & imaging features	Vascular involvement, lymphadenopathy, F13^a, F92^a	0.78	0.71	0.85

^aECOG, Eastern cooperative oncology group; PC1: the 1st principle component; F13: 9b_3D_Circularity; F92: 3D Laws features L5 L5 S5 Layer 1

ISSN: 1748-717X