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. 2017 Jan 1;8(1):74–84. doi: 10.7150/jca.16774

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Funnel plots of PFS and OS. Publication bias was assessed by the funnel plots. The X-axis was risk ratio (RR), and the y-axis represents the standard error (SE, log risk ratio). No publication bias was found using Egger's test (P=0.666, P=0.545) via R platform. Each study was divided into three sub-groups which represented by a different type of dot (black circle: 6-month, red diamond: 12-month, green square: 18-month). (A) Analysis of 6-, 12- and 18-month PFS. (B) Analysis of 6-, 12- and 18-month OS.