GNAS and pancreatic intraductal papillary-mucinous neoplasm: Ten (Amato et al. 2014; Chadwick et al. 2009; Fritz et al. 2009; Hosoda et al. 2015; Jang et al. 2009; Kuboki et al. 2015; Mohri et al. 2012; Singhi et al. 2014; Tan et al. 2015; Wu et al. 2011b) and six (Amato et al. 2014; Hosoda et al. 2015; Kuboki et al. 2015; Singhi et al. 2014; Tan et al. 2015; Wu et al. 2011b) studies described KRAS and GNAS mutations in IPMN patients, according to the microscopic duct type, respectively (Table 5).