CD274 and posterior cortical atrophy: As we have already observed upregulation of PD‐L1 expression in C4‐2 cells after CAR NK‐92 cell treatment and elucidated its mechanisms, we postulated that anti‐PD‐L1/PD‐1 mAb would reinvigorate exhausted T cells expressing PD‐1 on their surface bound by PD‐L1 from PCa cells.