Table 4. Results of meta−regression analysis exploring source of heterogeneity with OS and DFS.

Covariates	OS			DFS
	Coef.	S.E.	P value	Coef.	S.E.	P value
Country	−0.129	.083	0.144	−0.310	0.328	0.399
Case Number	0.263	0.261	0.331	0.227	0.576	0.713
Antibody	0.033	0.122	0.792	−0.250	0.103	0.071
Cut-off value	−0.065	0.121	0.599	0.310	0.123	0.065

Coef.: Coefficient; S.E.: Standard Error;