of Medicine between 2014 and 2019 were included in the study. The blocks that best reflected the tumor and were most suitable for immunohistochemical examination were selected.
Immunohistochemical stainingThin sections at a thickness of 4 microns were taken from the formalin-fixed, paraffin-embedded blocks. The sections were stained with primary antibodies PD-L1, PTEN, PHH3, and Ki-67 according to the manufacturers' instructions using a Leica
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