CD8A and neoplasm: Based on the results of WGCNA analysis and differential analysis, five circRNAs (hsa_circ_0001250, hsa_circ_0000724, hsa_circ_0003513, hsa_circ_000_2193, and hsa_circ_0003861) were identified as exhibiting a positive correlation with CD8+ T cells infiltration and exhibiting high expression levels in the tumor tissues (Figure S2E).