The uptake of 64Cu atezolizumab was investigated in vitro on PD-L1 transfected CHO-K1, PD-L1 positive cell lines MDA-MB-231, SUM149 (both triple negative breast cancer) and 4T1 (mouse triple negative breast cancer), resulting positively correlated to PD-L1 cell surface expression (CHO-K1 > MDA-MB231 > 4T1 > SUM149) (Lesniak et al., 2016). This evidence concerns the gene CD274 and triple-negative breast carcinoma.