CD226 and neoplasm: The levels of granzyme A and FasL in NK‐92‐derived exosomes (NK92‐Exos) were higher than those in NK‐Exos obtained from ex vivo expansion58 In the presence of IL‐15 and IL‐21 stimulation, NK92‐Exos showed enhanced cytotoxic effects against tumour cells through the upregulation of CD226 (DNAM‐1).63