CYP3A7 expression can also be found in a subset of the adult population who carry the CYP3A7*1C allele (Sim et al., 2005), which is associated with lower levels of dehydroepiandrosterone sulfate (DHEAS) in men (Smit et al., 2005) and is linked to mortality in breast and lung cancers (Johnson et al., 2016). The gene discussed is CYP3A7; the disease is lung cancer.