CD8A and gastric cancer: We extracted bulk mRNA expression data from the KM plotter database, dichotomized the ratio between the expression level of CD8A and either C1QA, C1QB or C1QC, and performed survival analysis for bladder, oesophageal, rectal, endometrial cancers,48 ovarian cancer,49 gastric cancer,50 lung adenocarcinoma and lung squamous cell carcinoma.51