MET and breast carcinoma: MET protein phosphorylation was evaluated in the three cell lines with MET tyrosine kinase domain mutations (UOK208, UOK337, and UOK345), two cell lines with high MET copy number (UOK332 and UOK342), and a breast cancer cell line, B5/589 (also known as 184‐B5) that served as a positive control for MET expression.