The previous findings that KGM is present in body fluids and organ tissues, indicate that the glutamine transaminases are active in vivo.19 Moreover, the results of glutamine tracer studies suggest that humans have a large capacity to transaminate glutamine.20 In order to assess the contribution of GTK in promoting cancer growth, we first assessed the expression of GTK in eight patient‐derived pancreatic cancer cell lines and identified P198 cells to have the strongest expression of GTK among these cell lines (Figure 3A). The gene discussed is KYAT1; the disease is cancer.