HTR1F and neoplasm: Analysis using the TIMER database showed that HTR1F expression was significantly correlated with B cells, CD4+ T cells, CD8+ T cells, neutrophils, macrophages, and dendritic cells in multiple tumor types, especially PRAD, LIHC, KIRP, HNSC, UCS, LUSC, KIRC, COADREAD, LGG, and PCPG, with the correlation being particularly significant in LUSC (Figure 2A).