Fulvestrant With or Without Lapatinib in Treating Postmenopausal Women With Stage III or Stage IV Breast Cancer That is Hormone Receptor-Positive

Memorial Sloan Kettering Cancer Center, New York

Staten Island University Hospital, Staten Island

Northern Westchester Hospital, Mount Kisco

Hematology Oncology Associates of Central New York-East Syracuse, East Syracuse

State University of New York Upstate Medical University, Syracuse

Roswell Park Cancer Institute, Buffalo

Saint Luke's University Hospital-Bethlehem Campus, Bethlehem

Abington Memorial Hospital, Abington

Saint Mary Medical and Regional Cancer Center, Langhorne

Christiana Care Health System-Christiana Hospital, Newark

Beebe Medical Center, Lewes

MedStar Georgetown University Hospital, Washington D.C.

Sibley Memorial Hospital, Washington D.C.

University of Maryland/Greenebaum Cancer Center, Baltimore

Greater Baltimore Medical Center, Baltimore

Saint Agnes Hospital, Baltimore

University of Maryland Shore Medical Center at Easton, Easton

Frederick Memorial Hospital, Frederick

Union Hospital of Cecil County, Elkton

Virginia Commonwealth University/Massey Cancer Center, Richmond

Southwest VA Regional Cancer Center, Norton

Danville Regional Medical Center, Danville

Wake Forest University Health Sciences, Winston-Salem

Southeastern Medical Oncology Center-Goldsboro, Goldsboro

Wayne Memorial Hospital, Goldsboro

Maria Parham Hospital, Henderson

Granville Medical Center, Oxford

Person Memorial Hospital, Roxboro

UNC Lineberger Comprehensive Cancer Center, Chapel Hill

Duke Raleigh Hospital, Raleigh

Duke University Medical Center, Durham

CaroMont Regional Medical Center, Gastonia

Rutherford Hospital, Rutherfordton

Southeastern Regional Medical Center, Lumberton

FirstHealth of the Carolinas-Moore Regional Hospital, Pinehurst

Vidant Oncology-Kinston, Kinston

Margaret R Pardee Memorial Hospital, Hendersonville

Mission Hospital, Asheville

Spartanburg Medical Center, Spartanburg

Saint Francis Hospital, Greenville

Prisma Health Cancer Institute - Eastside, Greenville

AnMed Health Hospital, Anderson

Boca Raton Regional Hospital, Boca Raton

Wellmont Holston Valley Hospital and Medical Center, Kingsport

University of Tennessee - Knoxville, Knoxville

University of Tennessee Health Science Center, Memphis

University of Mississippi Medical Center, Jackson

Keesler Medical Center, Keesler Air Force Base

Doctors Carrol, Sheth, Raghavan, Louisville

Grady Memorial Hospital, Delaware

Licking Memorial Hospital, Newark

Saint Ann's Hospital, Westerville

Fairfield Medical Center, Lancaster

Riverside Methodist Hospital, Columbus

Grant Medical Center, Columbus

Mount Carmel Health Center West, Columbus

Doctors Hospital, Columbus

Mary Rutan Hospital, Bellefontaine

Genesis Healthcare System Cancer Care Center, Zanesville

Case Western Reserve University, Cleveland

Cleveland Clinic Cancer Center Independence, Independence

Cleveland Clinic Foundation, Cleveland

Cleveland Clinic Akron General, Akron

Cleveland Clinic Wooster Family Health and Surgery Center, Wooster

Aultman Health Foundation, Canton

Clinton Memorial Hospital, Wilmington

Upper Valley Medical Center, Troy

Greene Memorial Hospital, Xenia

Grandview Hospital, Dayton

Good Samaritan Hospital - Dayton, Dayton

Miami Valley Hospital, Dayton

Miami Valley Hospital North, Dayton

Dayton Veterans Affairs Medical Center, Dayton

Kettering Medical Center, Kettering

Springfield Regional Medical Center, Springfield

Adena Regional Medical Center, Chillicothe

Marietta Memorial Hospital, Marietta

Saint Rita's Medical Center, Lima

Blanchard Valley Hospital, Findlay

Franciscan Saint Francis Health-Beech Grove, Beech Grove

Community Cancer Center East, Indianapolis

Community Cancer Center North, Indianapolis

IU Health La Porte Hospital, La Porte

Franciscan Saint Anthony Health-Michigan City, Michigan City

Elkhart General Hospital, Elkhart

Goshen Center for Cancer Care, Goshen

Saint Joseph Regional Medical Center-Mishawaka, Mishawaka

Memorial Hospital of South Bend, South Bend

Michiana Hematology Oncology PC-South Bend, South Bend

Northern Indiana Cancer Research Consortium, South Bend

Fort Wayne Medical Oncology and Hematology Inc-Parkview, Fort Wayne

Community Howard Regional Health, Kokomo

Reid Health, Richmond

William Beaumont Hospital-Royal Oak, Royal Oak

University of Michigan Comprehensive Cancer Center, Ann Arbor

Mid-Michigan Medical Center - Midland, Midland

Bronson Methodist Hospital, Kalamazoo

West Michigan Cancer Center, Kalamazoo

Bronson Battle Creek, Battle Creek

Borgess Medical Center, Kalamazoo

Lakeland Medical Center Saint Joseph, Saint Joseph

Marie Yeager Cancer Center, Saint Joseph

Oncology Care Associates PLLC, Saint Joseph

Spectrum Health Big Rapids Hospital, Big Rapids

Holland Community Hospital, Holland

Mercy Health Partners-Hackley Campus, Muskegon

Mercy Health Mercy Campus, Muskegon

Cancer Research Consortium of West Michigan NCORP, Grand Rapids

Mercy Health Saint Mary's, Grand Rapids

Spectrum Health at Butterworth Campus, Grand Rapids

Metro Health Hospital, Wyoming

Munson Medical Center, Traverse City

Green Bay Oncology - Iron Mountain, Iron Mountain

Green Bay Oncology - Escanaba, Escanaba

McFarland Clinic PC - Ames, Ames

Mercy Capitol, Des Moines

Iowa Methodist Medical Center, Des Moines

Iowa-Wide Oncology Research Coalition NCORP, Des Moines

Medical Oncology and Hematology Associates-Des Moines, Des Moines

Medical Oncology and Hematology Associates-Laurel, Des Moines

Mercy Medical Center - Des Moines, Des Moines

Iowa Lutheran Hospital, Des Moines

Medical Oncology and Hematology Associates-West Des Moines, Clive

Mercy Medical Center - North Iowa, Mason City

Siouxland Regional Cancer Center, Sioux City

Mercy Medical Center-Sioux City, Sioux City

Saint Luke's Regional Medical Center, Sioux City

Heartland Oncology and Hematology LLP, Council Bluffs

University of Iowa/Holden Comprehensive Cancer Center, Iowa City

Mercy Hospital, Cedar Rapids

Oncology Associates at Mercy Medical Center, Cedar Rapids

Ottumwa Regional Health Center, Ottumwa

University of Iowa Healthcare Cancer Services Quad Cities, Bettendorf

Genesis Medical Center - East Campus, Davenport

Genesis Cancer Care Institute, Davenport

Mercyhealth Hospital and Cancer Center - Janesville, Janesville

Dean Hematology and Oncology Clinic, Madison

Bay Area Medical Center, Marinette

Saint Vincent Hospital Cancer Center at Oconto Falls, Oconto Falls

Holy Family Memorial Hospital, Manitowoc

Green Bay Oncology - Sturgeon Bay, Sturgeon Bay

Saint Vincent Hospital Cancer Center Green Bay, Green Bay

Green Bay Oncology Limited at Saint Mary's Hospital, Green Bay

Saint Vincent Hospital Cancer Center at Saint Mary's, Green Bay

Gundersen Lutheran Medical Center, La Crosse

Regions Hospital, Saint Paul

Saint Joseph's Hospital - Healtheast, Saint Paul

United Hospital, Saint Paul

Minnesota Oncology Hematology PA-Maplewood, Maplewood

Saint John's Hospital - Healtheast, Maplewood

Minnesota Oncology Hematology PA-Woodbury, Woodbury

Woodwinds Health Campus, Woodbury

Fairview Ridges Hospital, Burnsville

Hutchinson Area Health Care, Hutchinson

Meeker County Memorial Hospital, Litchfield

Saint Francis Regional Medical Center, Shakopee

Ridgeview Medical Center, Waconia

Abbott-Northwestern Hospital, Minneapolis

Virginia Piper Cancer Institute, Minneapolis

Hennepin County Medical Center, Minneapolis

Metro Minnesota Community Oncology Research Consortium, Saint Louis Park

Park Nicollet Clinic - Saint Louis Park, Saint Louis Park

North Memorial Medical Health Center, Robbinsdale

Unity Hospital, Fridley

Mercy Hospital, Coon Rapids

Fairview-Southdale Hospital, Edina

Essentia Health Cancer Center, Duluth

Essentia Health Saint Mary's Medical Center, Duluth

Miller-Dwan Hospital, Duluth

Saint Luke's Hospital of Duluth, Duluth

Rice Memorial Hospital, Willmar

Sanford Cancer Center Oncology Clinic, Sioux Falls

Avera McKennan Hospital and University Health Center, Sioux Falls

Medical X-Ray Center, Sioux Falls

Avera Cancer Institute-Aberdeen, Aberdeen

Rapid City Regional Hospital, Rapid City

Altru Cancer Center, Grand Forks

Mid Dakota Clinic, Bismarck

Saint Alexius Medical Center, Bismarck

Sanford Bismarck Medical Center, Bismarck

Trinity Cancer Care Center, Minot

Billings Clinic Cancer Center, Billings

Northern Rockies Radiation Oncology Center, Billings

Saint Vincent Healthcare, Billings

Montana Cancer Consortium NCORP, Billings

Saint Vincent Frontier Cancer Center, Billings

Benefis Healthcare- Sletten Cancer Institute, Great Falls

Berdeaux, Donald MD (UIA Investigator), Great Falls

Great Falls Clinic, Great Falls

Saint Peter's Community Hospital, Helena

Saint James Community Hospital and Cancer Treatment Center, Butte

Bozeman Deaconess Hospital, Bozeman

Montana Cancer Specialists, Missoula

Saint Patrick Hospital - Community Hospital, Missoula

Community Medical Hospital, Missoula

Guardian Oncology and Center for Wellness, Missoula

Glacier Oncology PLLC, Kalispell

Kalispell Medical Oncology, Kalispell

Kalispell Regional Medical Center, Kalispell

Loyola University Medical Center, Maywood

West Suburban Medical Center, River Forest

Joliet Oncology-Hematology Associates Limited, Joliet

Rush - Copley Medical Center, Aurora

AMITA Health Adventist Medical Center, La Grange

University of Illinois, Chicago

University of Chicago Comprehensive Cancer Center, Chicago

Presence Saint Mary's Hospital, Kankakee

OSF Saint Anthony Medical Center, Rockford

Illinois CancerCare-Ottawa Clinic, Ottawa

Ottawa Regional Hospital and Healthcare Center, Ottawa

Illinois Valley Hospital, Peru

Valley Radiation Oncology, Peru

Perry Memorial Hospital, Princeton

Saint Margaret's Hospital, Spring Valley

Galesburg Cottage Hospital, Galesburg

Illinois CancerCare-Galesburg, Galesburg

Western Illinois Cancer Treatment Center, Galesburg

Kewanee Hospital, Kewanee

Mcdonough District Hospital, Macomb

Graham Hospital Association, Canton

Eureka Hospital, Eureka

OSF Saint Francis Radiation Oncology at Pekin Cancer Treatment Center, Pekin

Pekin Hospital, Pekin

Proctor Hospital, Peoria

Illinois CancerCare-Peoria, Peoria

Methodist Medical Center of Illinois, Peoria

OSF Saint Francis Medical Center, Peoria

Saint Joseph Medical Center, Bloomington

Hopedale Medical Complex - Hospital, Hopedale

Bromenn Regional Medical Center, Normal

Community Cancer Center Foundation, Normal

Carle Cancer Center, Urbana

Saint Anthony's Health, Alton

Memorial Hospital, Carthage

Decatur Memorial Hospital, Decatur

Heartland Cancer Research NCORP, Decatur

Mason District Hospital, Havana

Memorial Medical Center, Springfield

Good Samaritan Regional Health Center, Mount Vernon

Saint Luke's Hospital, Chesterfield

Washington University School of Medicine, St Louis

Missouri Baptist Medical Center, St Louis

Center for Cancer Care and Research, St Louis

Mercy Hospital Saint Louis, St Louis

Saint Louis-Cape Girardeau CCOP, St Louis

Southeast Missouri Hospital, Cape Girardeau

Saint Francis Medical Center, Cape Girardeau

Freeman Health System, Joplin

Missouri Cancer Associates, Columbia

University of Missouri - Ellis Fischel, Columbia

Lawrence Memorial Hospital, Lawrence

University of Kansas Cancer Center, Kansas City

Cotton O'Neil Cancer Center / Stormont Vail Health, Topeka

Cancer Center of Kansas - Fort Scott, Fort Scott

Cancer Center of Kansas - Chanute, Chanute

Via Christi Hospital-Pittsburg, Pittsburg

Hospital District Sixth of Harper County, Anthony

Cancer Center of Kansas - El Dorado, El Dorado

Cancer Center of Kansas-Kingman, Kingman

Cancer Center of Kansas - Newton, Newton

Cancer Center of Kansas - Pratt, Pratt

Cancer Center of Kansas - Wellington, Wellington

Cancer Center of Kansas - Winfield, Winfield

Associates In Womens Health, Wichita

Cancer Center of Kansas-Wichita Medical Arts Tower, Wichita

Ascension Via Christi Hospitals Wichita, Wichita

Cancer Center of Kansas - Wichita, Wichita

Cancer Center of Kansas-Independence, Independence

Cancer Center of Kansas - Parsons, Parsons

Cancer Center of Kansas - Salina, Salina

Cancer Center of Kansas - Dodge City, Dodge City

Southwest Medical Center, Liberal

Cancer Center of Kansas-Liberal, Liberal

Nebraska Methodist Hospital, Omaha

Louisiana State University Health Science Center, New Orleans

University Medical Center New Orleans, New Orleans

Baton Rouge General Medical Center, Baton Rouge

Mary Bird Perkins Cancer Center, Baton Rouge

University of Arkansas for Medical Sciences, Little Rock

Poudre Valley Hospital, Fort Collins

UCHealth Memorial Hospital Central, Colorado Springs

Welch Cancer Center, Sheridan

Portneuf Medical Center, Pocatello

Saint Luke's Mountain States Tumor Institute, Boise

American Fork Hospital / Huntsman Intermountain Cancer Center, American Fork

Intermountain Health Care, Salt Lake City

Utah Cancer Specialists-Salt Lake City, Salt Lake City

Cottonwood Hospital Medical Center, Murray

Intermountain Medical Center, Murray

Huntsman Cancer Institute/University of Utah, Salt Lake City

LDS Hospital, Salt Lake City

Logan Regional Hospital, Logan

McKay-Dee Hospital Center, Ogden

Utah Valley Regional Medical Center, Provo

Sandra L Maxwell Cancer Center, Cedar City

Dixie Medical Center Regional Cancer Center, St. George

University Medical Center of Southern Nevada, Las Vegas

Glendale Memorial Hospital and Health Center, Glendale

Providence Saint Joseph Medical Center/Disney Family Cancer Center, Burbank

Kaiser Permanente-San Diego Mission, San Diego

Arroyo Grande Community, Arroyo Grande

PCR Oncology, Arroyo Grande

Salinas Valley Memorial, Salinas

El Camino Hospital, Mountain View

Palo Alto Medical Foundation-Camino Division, Mountain View

Zuckerberg San Francisco General Hospital, San Francisco

UCSF Medical Center-Mount Zion, San Francisco

Valley Medical Oncology Consultants-Fremont, Fremont

Saint Rose Hospital, Hayward

East Bay Radiation Oncology Center, Castro Valley

Eden Hospital Medical Center, Castro Valley

Valley Medical Oncology Consultants-Castro Valley, Castro Valley

Valley Care Health System - Pleasanton, Pleasanton

Valley Medical Oncology Consultants, Pleasanton

Highland General Hospital, Oakland

Bay Area Breast Surgeons Inc, Emeryville

Alta Bates Summit Medical Center - Summit Campus, Oakland

Bay Area Tumor Institute, Oakland

Hematology and Oncology Associates-Oakland, Oakland

Tom K Lee Inc, Oakland

Doctors Medical Center- JC Robinson Regional Cancer Center, San Pablo

Northbay Cancer Center, Vacaville

University of California Davis Comprehensive Cancer Center, Sacramento

Fremont - Rideout Cancer Center, Marysville

Gene Upshaw Memorial Tahoe Forest Cancer Center, Truckee

Minor and James Medical PLLC, Seattle

Kaiser Permanente Washington, Seattle

University of Washington Medical Center, Seattle

PeaceHealth Saint Joseph Medical Center, Bellingham

Skagit Valley Hospital, Mount Vernon

Harrison HealthPartners Hematology and Oncology-Bremerton, Bremerton

Wenatchee Valley Hospital and Clinics, Wenatchee

Cancer Care Northwest - Spokane South, Spokane

Evergreen Hematology and Oncology PS, Spokane

Kadlec Clinic Hematology and Oncology, Kennewick

Saint Vincent's Medical Center, Bridgeport

Yale University, New Haven

Smilow Cancer Hospital-Torrington Care Center, Torrington

Harold Leever Regional Cancer Center, Waterbury

Elkhart Clinic, Elkhart

Eastern Maine Medical Center, Bangor

York Hospital, York Village

Brigham and Women's Hospital, Boston

Beth Israel Deaconess Medical Center, Boston

Dana-Farber Cancer Institute, Boston

Saint Anne's Hospital, Fall River

Addison Gilbert Hospital, Gloucester

Lowell General Hospital, Lowell

UMass Memorial Medical Center - University Campus, Worcester

New Hampshire Oncology Hematology PA-Concord, Concord

New Hampshire Oncology Hematology PA-Hooksett, Hooksett

LRGHealthcare-Lakes Region General Hospital, Laconia

Elliot Hospital, Manchester

Cooper Hospital University Medical Center, Camden

Saint Barnabas Medical Center, Livingston

Morristown Medical Center, Morristown

Virtua Memorial, Mount Holly

Overlook Hospital, Summit

Saint Francis Medical Center, Trenton

Inspira Medical Center Vineland, Vineland

Virtua Voorhees, Voorhees Township

Atrium Medical Center-Middletown Regional Hospital, Franklin

Wright-Patterson Medical Center, Wright-Patterson Air Force Base

Sanford USD Medical Center - Sioux Falls, Sioux Falls

Central Vermont Medical Center/National Life Cancer Treatment, Berlin Corners

University of Vermont and State Agricultural College, Burlington

Swedish Medical Center-First Hill, Seattle

Green Bay Oncology at Saint Vincent Hospital, Green Bay