4.

Pairwise comparisons of differences of DFS and OS between each sub-stage within anatomic groups

Anatomic stage groups	P value
	DFS					OS
	I	II	III	IV		I	II	III	IV
DFS, disease-free survival; OS, overall survival. Breslow pairwise comparison was applied, and P<0.05 was statistically significant.
I		0.001	0.101				0.503	0.109	0.021
II	0.001		0.316			0.503		0.620	0.220
III	0.101	0.316				0.109	0.620		0.438
IV						0.021	0.220	0.438