IL2 and neoplasm: Wu et al. introduced NDV Anhinga strain as a vaccine vector to express IL-2, which proved that the recombinant NDV-expressing IL-2 could enhance the in vivo anti-tumor ability, and it can not only directly kill tumors, but also cause an immune response and solid immune memory in vivo, thereby enhancing the anti-tumor characteristics by increasing the infiltration of lymphocytes in vivo.