To validate the predictive ability of the elevated expression of UGT8 in primary breast tumours, the level of mRNA for UGT8 was analysed in three independent cohorts of breast cancer patients whose microarray data were available (van de Vijver et al, 2002; Wang et al, 2005; Minn et al, 2005a, 2005b, 2007) (Figure 5). The gene discussed is UGT8; the disease is breast carcinoma.