The IHC staining was performed on cryostat sections (4 μm/section) of 786-O xenograft tumors, and the protocol was described in detail in previous studies [12 (link),25 (link)]. The primary antibody (anti-Akt Ser-473, 1: 50, Cellular Signaling Tech), and horseradish peroxidase (HRP)-coupled secondary antibody (Santa Cruz) were applied [12 (link)]. The positive staining was performed through peroxidase activity using the 3-amino-9-ethyl-carbazol (AEC) method (Merck, Shanghai, China).
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