SGK1 and glioblastoma: Further investigation into the mechanisms revealed that leech drug‐containing serum (LDS) induces apoptosis and autophagy in GBM cells by modulating the Serum and glucocorticoid‐regulated kinase‐1 (SGK1)/Caspase‐3 pathway and the phosphatidylinositol 3‐kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) pathway, respectively.