One single nucleotide polymorphism (SNP) in the gene encoding P53 (Arg72Pro, RS1042522), one dinucleotide polymorphism (G4C14-to-A4T14, RS 2273953, RS1801173) in the gene encoding P73, and two further SNPs in the same gene (-386 G/A, RS3765728; exon 5 T/C, RS1801174) were studied to determine whether DNA variations could influence the occurrence of the disease in a sample of Italian subjects with the sporadic late-onset form of AD.