The experiment was divided into four groups: the solvent control group (vehicle group: normal breast cancer cells + solvent), THC stimulation group (THC group: normal breast cancer cells + THC 80 μM), CYP1A1 overexpression group (CYP1A1 group: overexpression of CYP1A1 breast cancer cells), and THC-stimulated overexpression of the CYP1A1 breast cancer cell group (THC + CYP1A1 group: THC 80 μM + overexpression of CYP1A1 breast cancer cells). The gene discussed is CYP1A1; the disease is breast cancer.