BACKGROUND:Dysregulated circular RNAs have been implicated in the pathogenesis of cancer. Recent studies indicate that has_circ_0001649 lowly expressed in multiple types of cancer. The purpose of this study is to investigate the roles of has_circ_0001649 as a diagnostic and prognostic marker for Chinese patients with cancer. METHODS:Adhering to preferred reporting items for systematic reviews and meta-analyses guidelines, systematic literature searches were performed using Pubmed, Embase, and the web of Science to retrieve articles fulfilled all inclusion criteria. The significance of has_circ_0001649 in diagnosis and prognosis of cancer patients were evaluated. Meta-Disc 1. 4 and STATA 12. 0 were used to analyze the data from collected studies. RESULTS:Eleven articles with 761 patients were included in present meta-analysis, of which 4 were about diagnosis, 5 were about prognosis, and 6 were about tumor differentiation grade. For the diagnostic value of has_circ_0001649, the pooled results for sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, and diagnostic odds ratio with their 95% confidential intervals were 0. 78 (0. 73-0. 83), 0. 75 (0. 70-0. 80), 3. 17 (2. 56-3. 93), 0. 29 (0. 23-0. 36), and 11. 41 (7. 80-16. 7), respectively. The area under the curve of summary receiver operator characteristic was 0.8408 (Q = 0. 7725). Meanwhile, the result showed no obvious publication bias in this analysis for the P-value of Deeks' test was .489. For the prognostic value, the pooled hazard ratio for overall survival was 0.45 (0.324-0.626). Lower expression of has_circ_0001649 was also prone to lower tumor differentiation grade (odds ratio = 2.58, P < .0001). CONCLUSIONS:Has_circ_0001649 could be used as a potential biomarker for diagnosis and prognosis in solid cancer. Further prospective studies are required to validate its clinical application.