Fig. 1: circRNA expression profiles in HCC and paired nontumorous samples.

A–C Volcano and scatter plots show variation in circRNA expression between HCC and nontumor liver tissues from the GSE7852 (A), GSE94508 (B), and GSE97322 (C) datasets. D Venn diagram. E hsa_circ_101555 consists of six exons (exon 1–6, 815 nt) and is derived from the host gene CSNK1G1. The existence of the back-splice junction was confirmed by Sanger sequencing.