C1QA and cancer: As indicated in Figure 2, compared to normal tissues, C1QA was significantly upregulated in 15 types of cancer, namely, DLBC, ESCA, GBM, KIRC, KIRP, LGG, LIHC, OV, PAAD, SKCM, STAD, TGCT, THYM, UCEC, and UCS, while it was downregulated in LUSC.