CYP1A1 and breast cancer: The experiment was divided into four groups: solvent control group (vehicle group: normal breast cancer cells + solvent), high-dose THC stimulation group (THC group: normal breast cancer cells + THC 80 μM), CYP1A1 knockdown group (sh-CYP1A1group: CYP1A1 knockdown group), and THC-stimulated knockdown group (THC + sh-CYP1A1 group: THC 80 μM + sh-CYP1A1 breast cancer cells).