The clinicopathological and prognostic value of programmed death-ligand 1 in colorectal cancer: a meta-analysis
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Programmed death-ligand 1 (PD-L1) is reportedly expressed in colorectal tumors. However, the prognostic role of PD-L1 in colorectal cancer (CRC) remains controversial. Therefore, we performed a meta-analysis to investigate the clinicopathological and prognostic impact of PD-L1 in CRC.
A comprehensive search in PubMed, Embase, the Cochrane Library, Web of Science and the ClinicalTrials.gov for publications about PD-L1 expression in colorectal cancer was done. The correlation between PD-L1 expression and clinicopathological features or survival outcomes was analyzed by odds ratios (OR) or hazard ratios (HR), at 95% confidence intervals (CI).
The results show that the pooled HR of (1.34, 95% CI 1.02–1.65, p = 0.01) indicated the association of PD-L1 expression with overall survival (OS) in CRC patients. Meanwhile, the expression of PD-L1 was positively correlated with the lymph node metastasis (OR: 0.70, 95% CI 0.51–0.95, p = 0.00), gender (OR: 0.86, 95% CI 0.76–0.98, p = 0.05) and tumor location (OR: 1.39, 95% CI 1.14–1.71, p = 0.12).
These results suggest that high expression of PD-L1 is associated with low OS in CRC. High PD-L1 expression may act as a negative factor for patients with CRC and help to identify patients suitable for anticancer therapy.
KeywordsProgrammed death-ligand 1 Colorectal cancer Prognosis Meta-analysis
XN and JS: designed the study. XN, XS and LW: searched databases and collected full-text papers. YC, YZ and WL: performed statistical analysis. XN and DW: wrote the manuscript. All authors reviewed the final version of the manuscript.
Compliance with ethical standards
Conflict of interest
The authors certify that there is no conflict of interest regarding this manuscript.
Research involving human participants and/or animals
This article does not contain any studies with human participants or animals performed by any of the authors.
For this type of study, formal consent is not required.
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