Method: Multitissue blocks with various malignant lymphomas, renal tumours and normal tissues (n=218) were stained with three concentrated (conc) antibodies (Carb-3, MMA and BY87) according to predetermined in-house optimized protocols on two staining platforms. Ready-to-use (RTU) solutions of Carb-3 and MMA were also examined. Extension and intensity of stains was scored using the H-score method.