High nuclear phosphorylated extracellular signal-regulated kinase expression associated with poor differentiation, larger tumor size, and an advanced stage of breast cancer

*Dr. Kuo HT and Dr. Hsu HT contributed equally to this paper. 1Department of Internal Medicine, Division of Hepatogastroenterology, Chi-Mei Medical Center, Tainan, Taiwan 2Department of Pathology, Changhua Christian Hospital, Changhua, Taiwan 3Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan 4Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan 5Department of Medical Technology, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan 6Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan 7Division of Hematology and Oncology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan