Natural killer cell dysfunction is associated with colorectal cancer with severe COVID-19

Figure 3 Comparison of natural killer cell cytotoxic activity and natural killer cytotoxic factor activity between colorectal cancer and colorectal cancer with severe the coronavirus disease 2019 patients. ^aP < 0.05 vs colorectal cancer with severe the coronavirus disease 2019 (CRC⁺) via Student's t test; ^bP < 0.01 vs CRC⁺via Mann-Whitney U test; CRC: Colorectal cancer; CRC⁺: Colorectal cancer with severe the coronavirus disease 2019; NKCA: Natural killer cell cytotoxic activity; NKCF: Natural killer cytotoxic factor.