Table 4. Incorporation of oligometastasis into the MSKCC risk model.

	Model 1	P value*	Model 2	P value†
Variables	KPS≤70	0.002	KPS≤70	0.003
	DFI <1 year	0.237	DFI <1 year	0.263
	Hemoglobin < LLN	0.718	Hemoglobin < LLN	0.791
	Corrected calcium>10mg/dL	0.981	Corrected calcium>10mg/dL	0.980
	LDH >1.5 × ULN	0.057	LDH >1.5 × ULN	0.405
			Metastatic state	0.002
C-index (95%CI)	0.651 (0.571-0.732)		0.752 (0.676-0.829)

Abbreviations: MSKCC=Memorial Sloan Kettering Cancer Center; KPS= Karnofsky Performance Status; DFI = disease-free interval; LDH = lactate dehydrogenase;LLN = lower limit of normal

^*calculated in the multivariate analysis, which includes ECOG, DFI <1 year, hemoglobin<LLN, corrected calcium >10mg/dL, and LDH >1.5 × ULN as variables.

^†calculated in the multivariate analysis, which includes ECOG, DFI <1 year, hemoglobin<LLN, corrected calcium >10mg/dL, LDH >1.5 × ULN, and the metastatic state as variables.