In this study, NK cells began to proliferate in the early phase and the proliferation continued within 3 weeks after HSCT (Fig. 1C), while the frequency of CD107a+ NK cells was significantly higher in HSCT tumor than in non‐HSCT tumor at day 14 (Fig. 2D) but not at day 21 (data not shown). This evidence concerns the gene LAMP1 and neoplasm.