APOA1 and neoplasm: APOA1 expression was negatively correlated with tumor purity (r = − 0.152, p = 1.04e−3), CD8+ T cells (r = − 0.126, p = 8.51e−3), macrophages (r = − 0.144, p = 2.19e−3), neutrophils (r = − 0.164, p = 4.31e−3), and dendritic cells (r = − 0.101, p = 3.17e−3) (Fig. S3).