Nine out of 13 breast cancer cell lines including MDA-MB-231, MCF7, Hs578T, BT549, MDA-MB-453, T-47D, ZR-75.1, MDA-MB-361 and SK-BR3 showed low to undetectable levels of MTUS1, whereas CAMA-1, ZR-75.30, BT-474 and MDA-MB-468 expressed moderate levels of MTUS1 transcripts. Here, MTUS1 is linked to breast cancer.