Ectopic CT45A1 expression in two MSI‐H CRC cell lines did not alter the surface expression of MHC‐I (Fig. S2A,B), PD‐L1 (Fig. S2C,D), or sialylated ligands for Siglec‐7 (Fig. S2E,F) or Siglec‐9 (Fig. S2G,H). This evidence concerns the gene CT45A1 and colorectal carcinoma.