For tracking purposes, tumor cells were labeled with carboxyfluorescein succinimidyl ester (CFSE) (green) and NK cells were labeled with Cell-Tracker Deep Red (red) and then they were co-incubated in the presence of different aptamers (PD-L1-apt, CD16-apt, CmutP-bi-apt, CPmut-bi-apt, or CP-bi-apt). This evidence concerns the gene CD274 and neoplasm.