GNAS and pancreatic neoplasm: Among the KRAS (n = 17) and GNAS (n = 7) mutations found in the 21 resected pancreatic tumour tissues, the KRAS and GNAS mutations were detected in the pancreatic juice in 41.2% (7/17) and 71.4% (5/7) of cases, respectively (Table 5), indicating that the sensitivity of pancreatic juice for the detection of mutations of pancreatic tumours may reach approximately 50%.