HMGB1 and neoplasm: In the present study, we found that (1) knockout of HMGB1 in the tumor cells suppressed in vivo, but not in vitro, tumor growth, (2) the suppression of the in vivo tumor growth was mediated by CD8 T cells, and (3) infiltration of CD8 T cells, macrophages, and DCs into the tumor tissues was accelerated in HMGB1-knockout tumors.