Immunohistochemistry (IHC) was performed as published previously [10 (link)]. Tumor tissues were dissected, fixed in 4 % formalin overnight and processed in paraffin wax. Signal detection was performed semiautomatically in the Autostainer 480 S (Medac, Hamburg, Germany). Nuclei were stained by hematoxylin. See Table S1 for antibody details and dilution ratios. For IHC, 5 tumor tissues from TCam-2-ΔSOX2 clones and 1 tumor tissue from 2102EP cells as control was analyzed.
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