moderately significantP = .17
As most of the included studies were retrospective and differed in their study designs, moderately significant heterogeneity was found in the present meta-analysis ( I 2 = 62.9%, P = .17) for OS.
As most of the included studies were retrospective and differed in their study designs, moderately significant heterogeneity was found in the present meta-analysis ( I 2 = 62.9%, P = .17) for OS.