Glioma tissues were formalin-fixed, paraffin-embedded, and sectioned at a thickness of 4 μm. Immune complexes were detected with the SP Kit (Solarbio, Beijing, China) and DAB Substrate Kit (Solarbio, Beijing, China). Signals were detected using Olympus BX41 microscope. Immunohistochemistry was performed using standard protocols as described previously (24 (link)). Quantification of Immunohistochemistry (IHC) staining was performed in a blinded fashion. ImageJ and ImageJ plugin IHC profiler was applied to quantify IHC staining analysis as reported (25 (link)).
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