In our study, data from 140 invasive breast cancer patients were retrospectively collected to identify the association between PTPN4 expression and clinical outcomes of these patients. The expressions of PTPN4 were detected by immunohistochemical analysis. Breast hyperplasia tissues showed higher expression of PTPN4. We found that PTPN4 expression was lower in breast cancer patients with relapse than in patients without relapse. Patients with an increased PTPN4 level had a significantly longer relapse-free survival and overall survival time.
