CYP19A1 and Alzheimer disease: Within APOE ε4 carriers, a different distribution of the G allele and the AG + GG genotype of CYP19A1 rs3751592 were found in AD patients compared to control individuals.No differences were identified in the distribution of CYP19A1 rs1065778 between AD patients and controls, independent of APOE ε4 genetic status.