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Clinical progression of cancer patients is often observed despite the presence of tumor‐reactive T cells. Co‐inhibitory ligands of the B7 superfamily have been postulated to play a part in this tumor‐immune escape. One of these molecules, PD‐L1 (B7‐H1, CD274), is widely expressed on tumor cells and has been shown to mediate T‐cell inhibition. However, attempts to correlate PD‐L1 tumor expression with...