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Candidate circular RNAs in patients with GC and normal groups were analyzed by reverse transcription-quantitative PCR. (A) Compared with the normal group, the expression of plasma Hsa_circ_0021087 in patients with GC was down-regulated. (B) Hsa_circ_0005051 was downregulated in GC patients. Hsa_circ_0000332 (C), hsa_circ_0007518 (D), and hsa_circ_0000554 (E) were determined with no differential expression between the two groups. **P < 0.01. GC, gastric cancer.
