STX6 and pancreatic ductal adenocarcinoma: Has_circ_0007905 was produced from the STX6 mRNA located on chr1 (q25, 3) thereby it was termed as circSTX6 by Meng et al. Pancreatic ductal adenocarcinoma progression in vitro and in vivo in a ceRNA manner through sponging miR-449b-5p was also provoked by has_circ_0007905 (Meng et al., 2022).