Immunohistochemical (IHC) staining was carried out on tissue macromatricescomposed of representative tumor areas. Five different large tissue fragments from donor paraffin blocks were present in one recipient block. The sections (4 μm thick) were cut from each tissue macroarray block and placed on high-adhesive glass slides (SuperFrost Plus; Menzel-Glaser, Braunschweig, Germany). The sections were subjected to IHC staining according to the previously described protocol [10 (link),11 (link)]. Immunohistochemistry was carried out by BenchMark® Ultra automatic staining machine (Roche Diagnostics/Ventana Medical Systems, Tucson, AZ, USA) with Ventana UltraView DAB Detection Kit (Ventana Medical Systems). MATR3 was detected by using anti-MATR3 rabbit polyclonal antibody (cat. no: HPA036565, Sigma-Aldrich, St. Louis, MO, USA) in a 1:300 dilution for 32 min.
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