Randomized Phase II Trial of Letrozole With or Without Dasatinib as First and Second-line Treatment for Hormone Receptor-positive, HER2-negative Post-menopausal Breast Cancer That is Unresectable, Locally Recurrent or Metastatic

New York Oncology Hematology, Pc, Troy

Medical Oncology Associates, Kingston

Virginia Oncology Associates, Norfolk

Oncology & Hematology Associates Of Southwest Virginia, Inc., Salem

Florida Cancer Institute - New Hope, Hudson

Dayton Oncology And Hematology, Kettering

Central Indiana Cancer Centers, Carmel

Texas Oncology, Garland

Texas Oncology-Plano East, Plano

Texas Cancer Center At Medical City, Dallas

Texas Oncology, Dallas

Texas Oncology Sammons Cancer Center, Dallas

Tyler Cancer Center, Tyler

Texas Oncology, Bedord

Texas Oncology, Fort Worth

Texas Oncology Cancer Care And Research Center, Waco

Texas Oncology, Houston

Texas Oncology Cancer Center - Sugar Land, Sugar Land

Cancer Care Centers Of South Texas, San Antonio

Texas Oncology-Central Austin Cancer Center, Austin

El Paso Cancer Treatment Ctr - East, El Paso

Rocky Mountain Cancer Centers, Denver

Arizona Oncology Associates D.B.A. Hematology Oncology, Tucson

Northern Arizona Hematology & Oncology Associates, Sedona

Northwest Cancer Specialists, Pc, Portland

Willamette Valley Cancer Center, Eugene

Yakima Valley Memorial Hospital/North Star Lodge, Yakima