Comparison between the INS‐GAS and Gas−/− models has also revealed distinct roles for gastrin in distinct anatomical sections of the stomach, because tumor development is restricted to the corpus and antrum of these mice, respectively, and MNU‐treated INS‐GAS mice do not readily develop antral tumors.37 Collectively, these findings highlight the importance of considering the corpus and antrum as distinct anatomical sites when characterizing tumor pathology in mouse models. Here, GAST is linked to neoplasm.