Verification of the relatively expression level of 5 up-regulated circRNAs (092520, 102610, 004662, 103124, and 103546) by RT-PCR and qPCR. PBMCs from 52 CD patients and 38 HCs were used for initial verification. CircRNA_004662 was further validated in 87 CD patients and 55 HCs and 50 UC patients. The statistical significance between CD, UC, and HCs was calculated by Student t test or one-way ANOVA. A, The relative expression of circRNA_09250. B, The relative expression of circRNA_102610. C, The relative expression of circRNA_004662. D, The relative expression of circRNA_103124. E, The relative expression of circRNA_103546. P < .05 was considered as statistically significant. ∗P = .01; ∗∗P < .001. ANOVA = analysis of variance, CD = Crohn disease,circRNA = circular RNA, HCs = health controls, qPCR = quantitative polymerase chain reaction, RT-PCR = reverse transcription polymerase chain reaction, PBMCs = peripheral blood mononuclear cells, UC = ulcerative colitis.