dataset of proteins differentially expressed between breast cancer and adjacent non‐cancerous tissues.[51] The result revealed that 145 out of 200 proteins (72.5%) found in the mass spectrometry data set from ARID1B pulldown are differentially expressed in breast cancer tissue compared to normal tissue, further supporting the oncogenic role of ARID1B in breast cancer (Figure S13C, Supporting Information). Here, ARID1B is linked to breast cancer.