Mesothelin expression and survival outcomes in triple-receptor negative breast cancer.

e12002 Background: Mesothelin is an ideal tumor-associated marker for the development of targeted therapy due to its limited expression in normal tissues. Identify the frequency of mesothelin expression in triple negative breast cancer may lead the path to customize the drug development in this lack of effective targeted subgroup. The aim of this study was to evaluate mesothelin expression in triple-negative breast cancer (TNBC) and its correlation with survival outcomes. Methods: Mesothelin expression was completed using immunohistochemistry on formalin fixed paraffin tumor sections, and quantified by H-score. An H-score >10 was considered positive. Patient’s characteristics were compared by mesothelin expression. Kaplan-Meier product limit method was used to estimate survival outcomes. Cox proportional hazards models was used to adjust for patient and tumor characteristics. Results: Median age was 52 years. Of the 109 TNBC, 37 (34%) were positive for mesothelin expression. There were no differences on p...