Obesity and Breast Cancer : a Paradoxical and Controversial Relationship Influenced by Menopausal Status - García-Estévez, Laura (Centro de Investigación Biomédica en Red de Cáncer) ; Cortés, Javier (Vall d'Hebron Institut d'Oncologia) ; Pérez, Silvia (Breast Cancer Department, MD Anderson Cancer Center) ; Calvo Plaza, Isabel (Breast Cancer Department, MD Anderson Cancer Center) ; Gallegos, Isabel (Breast Cancer Department, MD Anderson Cancer Center) ; Moreno-Bueno, Gema (MD Anderson International Foundation) ; Universitat Autònoma de Barcelona