TABLE 2.

Corresponding risk score for each variable and total score.

Variables	Category	Score
Stage_N	N0	0
	N1	30
	N2	40
	N3	55
	N4	70
Tumor status	Tumor free	0
	With tumor	85
Risk model	Low	0
	High	60
Total score	Low risk	0–40
	Moderate risk	50–95
	High risk	≥100