Table 3.

The C-index results on fivefold cross-validation and test set.

No.	Method	Fivefold Cross-Validation
1	CT_all	0.659 ± 0.063
2	CT_only_tumour	0.627 ± 0.062
3	CT_largest_tumour	0.587 ± 0.040
4	CT_only_lymph_node	0.608 ± 0.059
5	CT_largest_lymph_node	0.605 ± 0.060
6	PET_all	0.622 ± 0.077
7	PET_only_tumour	0.603 ± 0.065
8	PET_largest_tumour	0.569 ± 0.054
9	PET_only_lymph_node	0.635 ± 0.074
10	PET_largest_lymph_node	0.644 ± 0.084
11	volume	0.598 ± 0.051
12	clinical	0.552 ± 0.032
13	radiomics_clinical	0.682 ± 0.083
No.	Method	Test Set
1	radiomics_clinical	0.672