To investigate the incidence and phenotype of ∆Np63/p40+ tumour cells in human breast carcinomas, we initially examined regional (axillary) lymph node metastases, where contaminating myoepithelial cells will not be present, with pan‐p63, TAp63 and ΔNp63/p40 antibodies. This evidence concerns the gene TP63 and breast carcinoma.