In previous studies, wide tissue distribution of MTUS1 mRNA was reported by quantitative RT-PCR and some new studies examined the down-regulation of MTUS1 in tumors such as ovarian cancer, pancreatic carcinoma or breast cancer, but to date nothing is known about the localisation of MTUS1 within these tissues (3,5,13,14,27). Here, MTUS1 is linked to breast cancer.