We also characterized the expression of PD‐L1 in secreted extracellular vesicles, which are known to be critical in the process of immune evasion in a variety of cancer types [44, 45], and found that DRD1 also reduced exosomal PD‐L1 expression without altering the secretion of total exosomes, quantified using Nanosight software (Fig. S5D). Here, CD274 is linked to cancer.