LAMP1 and pancreatic ductal adenocarcinoma: Chen et al. suggested that Ubiquitin-like protein 4A (UBL4A) was low expressed in pancreatic ductal adenocarcinoma, while LAMP1 was positively correlated with UBL4A, and UBL4A exerted antitumor effects on autophagy-related proliferation and metastasis in pancreatic ductal adenocarcinoma (PDAC) by upregulating LAMP1 [18].