ST18 and glioblastoma: We analyzed the potential associations between immune cell infiltration and GBM prognosis-related genes (MEOX2, PHYHIP, RBBP8, ST18, TCF12, and THRB) through the online database TIMER, where most genes were significantly associated with purity, containing MEOX2, PHYHIP, RBBP8, ST18, and TCF12, and conversely, the fewest genes were significantly associated with macrophage (MEOX2, TCF12) and neutrophil (PHYHIP, ST18) (Figure 9).