Analysis of circRNA sequencing databases circBase (http://www.circbase.org/) and circRNADb (http://reprod.njmu.edu.cn/circrnadb) revealed 3 potential circRNAs derived from HuR. Among them, hsa_circ_23897 and hsa_circ_0049027 were validated by PCR amplification using divergent primers from cDNA, but not from genomic DNA, of gastric cancer cell lines (Fig. 1a, b). This evidence concerns the gene ELAVL1 and gastric cancer.