CD73 scoring
tumor
TUMOR
CD73 (Abcam EPR6115 clone, ab124725, 1:250 dilution) IHC assessment was performed on a baseline tumor lesion on the VENTANA Benchmark at the Institut Jules Bordet (central laboratory). CD73 positivity threshold was set at ≥1% of the stained tumor and/or stromal cells relative to the tissue area (tumor and stroma). For exploratory biomarker analyses, the CD73 staining was quantified as histological score (