GNAS and pancreatic intraductal papillary-mucinous neoplasm: Seven (Hosoda et al. 2015; Lee et al. 2014; Schönleben et al. 2008; Singhi et al. 2014; Uemura et al. 2003; Wu et al. 2011b; Yoshizawa et al. 2002) and four (Hosoda et al. 2015; Lee et al. 2014; Siddiqui et al. 2013; Wu et al. 2011b) studies presented KRAS and GNAS mutations between IPMN and MCN patients.