CD4 and cancer: The results demonstrated correlations between KIFC1 expression and the infiltration levels of various immune cell types, including B cells, cancer-associated fibroblasts (CAFs), CD4+ T cells, CD8+ T cells, dendritic cells, endothelial cells (Endo), eosinophils (Eos), γδT cells, hematopoietic stem cells (HSCs), macrophages, mast cells, myeloid-derived suppressor cells (MDSCs), monocytes, neutrophils, lymphoid progenitor cells, myeloid progenitor cells, monocyte progenitor cells, T follicular helper cells (Tfh), NK T cells, and regulatory T cells (Tregs) in pan-cancer.