HTR2A and low grade glioma: It was found that the expression of HTR2A was high in 3 tumor types (supratentorial ependymomas [STES], pan-kidney [KIPAN], stomach adenocarcinoma [STAD]), predicting poor prognosis; however, it was poorly expressed in 2 tumor types (GBMLGG, low-grade glioma [LGG]) predicting the poor prognosis (Figure 4A).