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Recurrence-free survival in ER-positive patients with different genotypes of SULT1A1 and tamoxifen randomisation. The solid line represents patients homozygous for the SULT1A1*1 allele, and the dotted line represents patients homozygous or heterozygous for the SULT1A1*2 allele. (a) SULT1A1 and 2 years of tamoxifen therapy; (b) SULT1A1 and 5 years of tamoxifen therapy.
