Among molecules involved in immune escape, CD155 antigen was expressed in 100% of CTC-AT (Fig. 2 C) while PD-L1 by 82 ± 2.4% of cells with a MFI of 7285 that was almost three times higher than Sk-Mel-28 (MFI: 2689). Here, CD274 is linked to ataxia telangiectasia.