Interestingly, our analysis of E47 (TCF3) and IDs expression in the N0 breast carcinoma series profiled by Van’t Veer et al. [36] indicates that the expression of E47 and ID1 is significantly associated with the basal-like phenotype in sporadic tumours, in agreement with previous observations on ID1 protein expression [21]. This evidence concerns the gene ID1 and breast carcinoma.