Our findings showed that CYP1B1 was inhibited by quercetin, which is similar to previous research using human cancer cell lines, including THP-1, HUVECs, and human aortic endothelial cells (HAECs) (Chaudhary and Willett, 2006; Li et al., 2017; Feng et al., 2019). The gene discussed is CYP1B1; the disease is cancer.