RASAL2 and pancreatic neoplasm: To understand the role of RASAL2 in PDAC development and progression, we firstly analyzed the deferentially expressed genes and identified top 30 overexpressed genes in PDAC from GSE15471 dataset of GEO database (based on Affymetrix Human Genome U133 Plus 2.0 array sequencing of pancreatic tumor and matched normal tissues).