A single nucleotide variant (SNV; SNP) located in intron 4 of the human TERT gene (rs10069690; c.1951-205G>A; g.20373G>A; g.1279675C>T; hereafter referred to as rs10069690, with alleles C and T) was genotyped in a hospital-based case-control study of 403 breast cancer patients and 246 female controls. The gene discussed is TERT; the disease is breast cancer.