GAST and colorectal carcinoma: Therefore, in the current study, we analyzed the patients diagnosed with CRC treated in our hospital and some healthy subjects during the period between August 2016 and July 2019, and our objective was to detect the correlations among H. pylori infection, the level of gastrin, and the occurrence of CRC in patients aged more than 50 years old, and determine if CRC patients aged over 50 years have a different carcinogenic mechanism.