《Table 1Patients’characteristics from the selected studies.》

《Table 1Patients’characteristics from the selected studies.》   提示:宽带有限、当前游客访问压缩模式
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《The clinicopathological and prognostic significance of PD-L1 expression in pancreatic cancer: A meta-analysis》


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IHC:immunohistochemistry;NA:not available.

A flow chart of the study selection criteria is shown in Fig.1.The patient characteristics and study quality scores are listed in Table 1.Nine articles with 989 PDAC patients were evaluated.Among these articles,one had no direct data of PD-L1 positive rate[14].Three articles had no available data for prognostic calculation[15–17].Five studies with 688 PDAC patients were included in the prognostic meta-analysis[18–22].One study had the HR and 95%CI for the reported OS directly;Kaplan–Meier curves were used to estimate the HRs and 95%CIs for the remaining studies.