MTA2 and breast carcinoma: In accordance with previous studies, the overexpression of MTA1 did not repress MTA2 transcription (Fig. 2g).To further determine if there’s negative correlation between the protein levels of MTA1 and MTA2 in luminal B breast cancer patients, we performed Immunohistochemistry (IHC) staining for MTA1 and MTA2 on slices prepared from serial section.