SAMSN1 and neoplasm: To test whether the presence of a functional adaptive immune system per se in a murine recipient was sufficient to restore the tumor suppressor effect of Samsn1 previously observed in immunocompetent KaLwRij mice,37 Samsn1 expressing 5TGM1 cells were injected into the non‐syngeneic (genetically nonidentical) but immunocompetent C57BL/6 mice.