This study observed significant upregulation of HTR2A in 7 cancers (GBMLGG、LGG、STES、STAD、PAAD、ALL、LAML) and significant downregulation in 22 cancers (GBM、UCEC、BRCA、CESC、LUAD、ESCA、KIRP、KIPAN、COAD、COADREAD、PRAD、LUSC、LIHC、SKCM、BLCA、THCA、READ、OV、TGCT、UCS、ACC、KICH)(Figure 3A). This evidence concerns the gene HTR2A and cancer.