Real-Life Effectiveness Of T-Dm1 In Heavily Pretreated Her2-Positive Advanced Breast Cancer Patients: An Italian Observational Study.

e12019Background: T-DM1 showed remarkable activity in metastatic (m) HER-2 positive breast cancer (BC) and it recently was approved for clinical use in patients (pts) who previously failed trastuzumab and taxanes. The impact of drug prescription in real life compared with the findings reported in clinical trials exerting a strict accrual criteria has been rarely assessed. We investigated use and effectiveness of T-DM1 in daily practice. Methods: We included all pts with HER2-positive mBC, diagnosed in 12 Italian oncology hospitals between 2013 and 2015. Our aim was to assess the actual use of T-DM1 in HER2 positive mBC pts and its efficacy in clinical practice. Results: The data of 119 pts were retrospectively collected. The median age was 49 years (28-78), visceral metastases were present in 91 pts (77%) and brain metastases in 44 (37%). It is noteworthy that 29 pts (24%) received T-DM1 as second-line, 42 (35%) as third-line, and 43 (36%) as fourth- or further-line option. Moreover, 4 pts had TDM-1 as fi...