FLT3LG and neoplasm: Since the expression level of FLT3LG is significantly correlated with the activity and infiltration of diverse immune cells in LUAD, along with the abundance of immune cells in the tumor microenvironment, and can, to some extent, determine the therapeutic efficacy in patients with tumors [40, 41], it is plausible that the expression level of FLT3LG may be a potential predictor of the effectiveness of immunotherapy in patients with LUAD.