CEACAM6 and neoplasm: Moreover, the internalization of 131I‐tinurilimab in A549 cells was significantly increased from 56.36 ± 0.97% at 2 h to a maximum of 81.85 ± 3.64% at 8 h compared with that in Huh7 cells (42.87 ± 4.83 to 44.60 ± 1.89%) (Figure 5D), indicating a favorable internalization of 131I‐tinurilimab in CEACAM6‐positive tumor cell.