The present application relates to the field of vaccines, in particular to an engineered myeloid
cell and a preparation method and use thereof. The present application provides an
antigen-modified gel, an engineered myeloid
cell and use thereof, wherein the
antigen-modified gel comprises a plurality of immunostimulants and tumor antigens, attracts monocytes to migrate into and differentiate into
antigen-presenting cells, and the activated and antigen-loaded monocytes further migrate out of the gel to
lymph nodes, and can efficiently induce an anti-tumor immune response of lymphocytes such as T cells.