B2M and neoplasm: Next, we co‐cultivated Renca cells with CD8+ T cells by a 1:3 ratio for 24 hours (Figure 5E) and found that a higher Annexin V positive proportion in the Renca cells transfected with the B2M‐Overexpression group while the remaining tumor cell numbers were lower than those in the vehicle group (Figure 5F,G).