CEACAM6 and neoplasm: Interaction between CEACAM6 on human solid cancer cells and CEACAM1 on activated tumor-reactive T cells suppresses the antitumor function of T cells, and a humanized anti-CEACAM6 antibody, BAY 1834942, blocks this interaction and restores the antitumor activity of T cells in CEACAM6-positive tumors [67].