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To observe the prognostic value of circular RNA mitochondrial tRNA translation optimization 1 (circMTO1) in human tumors. We searched multiple databases for related reports published before November 01, 2021. The OR/HR and 95% CI were extracted to explore the correlation between circMTO1 expression and clinicopathological features in various cancers. The stability of the results from meta-analysis was estimated via sensitivity analysis. We adopted Begg’s funnel plots and Egger’s test to appraise the potential bias of publication. Subgroup analysis for overall survival (OS) were also performed. 11 studies containing 1383 patients and 4 articles including 536 patients were enrolled. We found that low expression status of circMTO1 was significantly related to big tumor size (OR=2.11, 95% CI: 1.26-3.56, P&lt;0.05), poor differentiation tumors (OR=2.09, 95% CI: 1.46-2.98, P&lt;0.05), OS (HR=2.02, 95% CI: 1.63-2.50, P&lt;0.05), disease-free survival (DFS) (HR=1.83, 95% CI: 1.27-2.56, P&lt;0.05) of cancers. Subgroup analysis indicated that low expression status of circMTO1 was correlated with OS, regardless of analysis method, cut-off value, case number and NOS score. The low expression of circMTO1 may predict big tumor size, poor differentiation and worse outcome of cancer, presenting that circMTO1 may be a useful biomarker for prognosis of tumors.

Investigation of the clinicopathological and prognostic role of circMTO1 in multiple cancers