METASTATICBREASTCANCERALLIANCE ATYPICAL RESPONDERS ANALYSIS ANNE LOESER1 , KRISTINE DE LA TORRE, PH.D.1 , ELLY COHEN, PH.D.1,3,4 , MARC HURLBERT, PH.D. 1,2 1 Metastatic Breast Cancer Alliance, New York, NY; 2 Breast Cancer Research Foundation, New York, NY; 3 BreastCancerTrials.org, San Francisco, CA; 4 University of California Department of Surgery, San Francisco, CA OCTOBER 2017 GRAPHIC DESIGN by Moriah Ray