The tryptamine receptor TAAR1 is a potential cancer prognosis biomarker [27] and it could induce the transcription of the aryl hydrocarbon receptor (AHR) target gene cytochrome P450 1A1 (CYP1A1), leading to the activation of the conversion of organic compounds to cytotoxic or carcinogenic species [38]. This evidence concerns the gene CYP1A1 and cancer.