Circular RNA hsa_circ_0000745 may serve as a diagnostic marker for gastric cancer.
AIM
To determine whether circular RNAs (circRNAs) are involved in pathological processes of gastric cancer (GC).


METHODS
Three circRNAs with differential expression in GC and colorectal cancer were randomly selected for validation by quantitative reverse transcription-polymerase chain reaction (qRT-PCR), using 20 pairs of gastric tissues and normal tissues. Based on the predicted circRNA-miRNA network, we then focused on hsa_circ_0000745, which was found to be down-regulated in 20 GC tissues compared with normal tissues. The hsa_circ_0000745 levels were further analyzed by qRT-PCR in 60 GC tissues and paired adjacent non-tumor tissues, as well as 60 plasma samples from GC patients and 60 plasma samples from healthy controls. The associations between the levels of hsa_circ_0000745 and the clinicopathological features of GC patients were statistically assessed. A receiver operating characteristic (ROC) curve was used to evaluate the diagnostic value of hsa_circ_0000745 in GC.


RESULTS
Hsa_circ_0000745 was down-regulated in GC tissues vs non-tumorous tissues (P < 0.001) and in plasma samples from patients with GC vs healthy controls (P < 0.001). The expression level of hsa_circ_0000745 in GC tissues correlated with tumor differentiation, while the expression level in plasma correlated with tumor-node-metastasis stage. The area under the ROC curve (AUC) of hsa_circ_0000745 in plasma was 0.683, suggesting good diagnostic value. Plasma hsa_circ_0000745 level combined with carcinoembryogenic antigen (CEA) level increased the AUC to 0.775.


CONCLUSION
Hsa_circ_0000745 plays an important role in GC and its expression level in plasma in combination with CEA level is a promising diagnostic marker for this malignancy.
['Huang|Mei|M|', 'He|Yi-Ren|YR|', 'Liang|Li-Chuan|LC|', 'Huang|Qiang|Q|', 'Zhu|Zhi-Qiang|ZQ|']
D014408:Biomarkers, Tumor D002272:Carcinoembryonic Antigen D015179:Colorectal Neoplasms D015536:Down-Regulation D005260:Female D015972:Gene Expression Regulation, Neoplastic D006801:Humans D008297:Male D035683:MicroRNAs D008875:Middle Aged D009367:Neoplasm Staging D012313:RNA D000079962:RNA, Circular D012372:ROC Curve D060888:Real-Time Polymerase Chain Reaction D013274:Stomach Neoplasms
Circular RNA Gastric cancer Diagnosis Noncoding RNA circ_0000745