MYH9 and pancreatic ductal adenocarcinoma: CircSTX6 regulates the expression of non-muscle myosin heavy chain 9 (MYH9) via the circSTX6/miR-449b-5p and circSTX6/CUL2/HIF-1α pathways, promoting the proliferation and migration of pancreatic ductal adenocarcinoma (PDAC) cells [143].