Treatment Patterns And Associated Adverse Events Among Patients With Metastatic Triple-Negative Breast Cancer.

e12576Background: Triple-negative breast cancer (TNBC) accounts for 10–20% of all breast cancers and about 4% are metastatic (mTNBC) at diagnosis. This research aims to describe treatment patterns and associated adverse events (AEs) among mTNBC patients. Methods: MarketScan Commercial Claims and Encounters and Medicare Supplemental Database, linked to an oncology EMR database, was used to identify patients with mTNBC. Demographic factors, clinical characteristics, mTNBC treatment patterns (treatment type and initial regimen), and the incidence of associated AEs (rates per 100 person-years) were tabulated. Patients seen in oncology practices between January 1, 2011 and June 30, 2015 were included in the study and were required to have continuous enrollment overlap in the administrative claims data for 6 months before the first diagnosis and throughout the variable-length follow-up period. Follow-up ended due to death, end of continuous enrollment, or end of study (whichever occurred earlier). Results: The ...