Clinical Study for the Treatment of Breast Cancer: the Patient Will Receive Afatinib Plus Letrozole or Letrozole Alone

Hospital de Especialidades de Jerez de La Frontera, Jerez de la Frontera

Complexo Hospitalario Universitario A Coruña, A Coruña

Hope Women's Cancer Centers, Asheville

Hospital Clínico Universitario Virgen de La Arrixaca, Murcia

Orlando Health, Inc., Orlando

Hospital Universitari de Sant Joan de Reus, Reus

Hospital Universitario Miguel Servet, Zaragoza

Clinical Center of University in Sarajevo, Clinic for Oncology, Sarajevo

University Clinical Center Tuzla Clinic for Oncology, Hematology and Radiotherapy, Tuzla

University Hospital Clinical Center Banja Luka, Oncology Clinic, Banja Luka

Comprehensive Cancer Centers of Nevada, Las Vegas

University of California Los Angeles Hematology Oncology, Los Angeles

DBA Torrance Memorial Physician Network/Cancer Care Associates, Redondo Beach

West Valley Hematology Oncology Medical Group, Northridge

St. Jude Heritage Healthcare, Fullerton

Coastal Integrative Cancer Care, San Luis Obispo

Central Coast Medical Oncology Corporation, Santa Maria

County Hospital Ploiesti, Ploieşti

County Emergency Clinical Hospital Cluj-Napoca Oncology Department, Cluj-Napoca

SC Medisprof SRL, Cluj-Napoca

"County Emergency Hospital Sf Ioan cel Nou", Suceava

Filantropia Clinical Hospital, Bucharest

Oncomed SRL Timisoara, Timișoara

Complejo Hospitalario Universitario de Albacete, Albacete

Hospital General Universitario de Alicante, Alicante

Hospital Son Llatzer, Palma de Mallorca