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*[[IHC]] testing using a PD-L1 antibody (demonstrating positive tumour cells) predicts response to anti-PD-L1 drugs.<ref name=pmid26970723/> | *[[IHC]] testing using a PD-L1 antibody (demonstrating positive tumour cells) predicts response to anti-PD-L1 drugs.<ref name=pmid26970723/> | ||
*The plethora of companion diagnostics developed for each PD-1/ PD-L1 inhibitor has created challenges, as these assays include different IHC antibody clones, staining protocols and platforms, scoring systems, and cutoffs for defining positivity. | *The plethora of companion diagnostics developed for each PD-1/ PD-L1 inhibitor has created challenges, as these assays include different IHC antibody clones, staining protocols and platforms, scoring systems, and cutoffs for defining positivity. | ||
**Nivolumab - 28-8 (Dako) | |||
**Pembrolizumab - 22C3 (Dako) | |||
**Aterolizumab - SP142 (Ventana) | |||
**Durvalumab - SP263 (Ventana) | |||
**Avelumab - 73-10 (Dako) | |||
===Background=== | ===Background=== |
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