For antitumor activity, Quercetin can suppress tumor biological processes by regulating gene expression, such as inhibiting TLR‐4 to reduce cell migration and invasion ability and activating ERβ2 to induce tumor cell apoptosis (Maugeri et al. 2023), and modulating Let‐7, miR‐21, and miR‐155 to inhibit the occurrence and development of cancer (D. H. Kim et al. 2019). The gene discussed is TLR4; the disease is cancer.