KRAS and pancreatic intraductal papillary-mucinous neoplasm: A KRAS mutation at codon 12 was detected by ddPCR in DF-derived cfDNA samples from 15/18 (83.3%) subjects (3 PDAC patients, 1 CCA patient, 2 IPMN patients, 2 pancreatitis patients, and 7 controls).