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). The gene discussed is CD4; the disease is neoplasm.