CSPP1 and hepatocellular carcinoma: The expression values of circ-CSPP1 in samples from GSE78520 (3 pairs of HCC and matched non-tumor liver tissues), GSE97332 (7 pairs of HCC and matched non-tumor liver tissues) and GSE94508 (5 pairs of HCC and paracancerous liver tissues) were displayed in Fig. 1b–d.