Combining THUMPD1 expression data and infiltration scores of six immune cell types (B cells, CD4+ T cells, CD8+ T cells, dendritic cells, macrophages and neutrophils), we discovered significant correlations in several cancers, among which the top three cancers with highest infiltration scores were colon adenocarcinoma (COAD), KIRC and LIHC. The gene discussed is CD8A; the disease is colon adenocarcinoma.