Immunostainings were carried out using 4 μm tissue sections according to standard procedures. Briefly, after antigen retrieval, samples were blocked with Peroxidase-Blocking Solution (Dako, S202386) for 10 min at RT. Primary antibodies (see Supplementary Table 2) were incubated o/n at 4oC. Slides were washed with EnVision™ FLEX Wash Buffer (Dako, K800721). Corresponding secondary antibody was incubated with the sample for 45 min at RT. Samples were developed using 3,3′-diaminobenzidine, counterstained with hematoxylin and mounted. Staining analyses were performed with QuPath software v.0.3.274 (link) and by histological scoring (H-Score)75 (link).
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