PD-L1 IHC 22C3 pharmDx is a qualitative immunohistochemical assay using monoclonal mouse anti-PD-L1, Clone 22C3 intended for use in the detection of PD-L1 protein in formalin-fixed, paraffin-embedded (FFPE) non-small cell lung cancer (NSCLC), gastric or gastroesophageal junction (GEJ) adenocarcinoma, esophageal cancer, cervical cancer, urothelial carcinoma and head and neck squamous cell carcinoma (HNSCC) tissues using EnVision FLEX visualization system on Autostainer Link 48.
PD-L1 protein expression in NSCLC is determined by using Tumor Proportion Score (TPS), which is the percentage of viable tumor cells showing partial or complete membrane staining at any intensity.
PD-L1 protein expression in gastric or GEJ adenocarcinoma, esophageal cancer, cervical cancer, urothelial carcinoma and HNSCC is determined by using Combined Positive Score (CPS), which is the number of PD-L1 staining cells (tumor cells, lymphocytes, macrophages) divided by the total number of viable tumor cells, multiplied by 100.
PD-L1 IHC 22C3 pharmDx is indicated as an aid in identifying NSCLC, gastric or GEJ adenocarcinoma, esophageal cancer, cervical cancer, urothelial carcinoma and HNSCC patients for treatment with KEYTRUDA® (pembrolizumab). Please refer to the Instructions for Use for indications and PD-L1 expression levels.
For details on staining interpretation, refer to section 13 of the Instructions for Use and indication-specific PD-L1 IHC 22C3 pharmDx Interpretation Manuals.
PD-L1 IHC 22C3 pharmDx Kit
The kit includes reagents required for the immunohistochemical staining (except wash buffer), control slides representing different expression levels of PD-L1 protein, and detailed instructions. The kit has been tailored especially for use on Autostainer Link 48 instruments. The materials provided are sufficient for 50 tests (50 slides incubated with monoclonal mouse antibody to PD-L1 and 50 slides incubated with the corresponding negative control reagent, 100 slides in total).
For countries outside of the United States, see the local KEYTRUDA product label for approved indications and expression cutoff values to guide therapy.
KEYTRUDA is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.
For In Vitro Diagnostic Use.