Breast Density, Hormone Levels, and Anticancer Drug Levels in Women With Invasive Breast Cancer Who Are Receiving Exemestane or Anastrozole

Albert Einstein Cancer Center at Albert Einstein College of Medicine, The Bronx

Brookdale University Hospital and Medical Center, Brooklyn

Adirondack Cancer Care - Glens Falls, Glens Falls

Finger Lakes Hematology and Oncology, Clifton Springs

Geisinger Medical Group - Scenery Park, State College

Mount Nittany Medical Center, State College

Lewistown Hospital, Lewistown

St. Luke's Cancer Network at St. Luke's Hospital, Bethlehem

Frank M. and Dorothea Henry Cancer Center at Geisinger Wyoming Valley Medical Center, Wilkes-Barre

Guthrie Cancer Center at Guthrie Clinic Sayre, Sayre

Bryn Mawr Hospital, Bryn Mawr

CCOP - Main Line Health, Wynnewood

Lankenau Cancer Center at Lankenau Hospital, Wynnewood

Chester County Hospital, West Chester

Cancer Center at Phoenixville Hospital, Phoenixville

Pottstown Memorial Regional Cancer Center, Pottstown

Sibley Memorial Hospital, Washington D.C.

Greenebaum Cancer Center at University of Maryland Medical Center, Baltimore

Alvin and Lois Lapidus Cancer Institute at Sinai Hospital, Baltimore

Fredericksburg Oncology, Incorporated, Fredericksburg

Rutherford Hospital, Rutherfordton

FirstHealth Moore Regional Community Hospital Comprehensive Cancer Center, Pinehurst

Kinston Medical Specialists, Kinston

Pardee Memorial Hospital, Hendersonville

CCOP - Upstate Carolina, Spartanburg

Gibbs Regional Cancer Center at Spartanburg Regional Medical Center, Spartanburg

AnMed Cancer Center, Anderson

Northeast Georgia Medical Center, Gainesville

Augusta Oncology Associates - Walton Way, Augusta

Mayo Clinic - Jacksonville, Jacksonville

West Florida Cancer Institute at West Florida Hospital - Pensacola, Pensacola

James Graham Brown Cancer Center at University of Louisville, Louisville

Grady Memorial Hospital, Delaware

Licking Memorial Cancer Care Program at Licking Memorial Hospital, Newark

Mount Carmel St. Ann's Cancer Center, Westerville

Fairfield Medical Center, Lancaster

CCOP - Columbus, Columbus

Grant Medical Center Cancer Care, Columbus

Mount Carmel Health - West Hospital, Columbus

Doctors Hospital at Ohio Health, Columbus

Mary Rutan Hospital, Bellefontaine

Wood County Oncology Center, Bowling Green

Northwest Ohio Oncology Center, Maumee

St. Luke's Hospital, Maumee

Flower Hospital Cancer Center, Sylvania

Fulton County Health Center, Wauseon

Toledo Hospital, Toledo

St. Vincent Mercy Medical Center, Toledo

St. Charles Mercy Hospital, Oregon

Toledo Clinic - Oregon, Oregon

CCOP - Toledo Community Hospital, Toledo

Toledo Clinic, Incorporated - Main Clinic, Toledo

Genesis - Good Samaritan Hospital, Zanesville

Mercy Cancer Center at Mercy Medical Center, Canton

Firelands Regional Medical Center, Sandusky

North Coast Cancer Care, Incorporated, Sandusky

Mercy Hospital of Tiffin, Tiffin

Clinton Memorial Hospital, Wilmington

Ruth G. McMillan Cancer Center at Greene Memorial Hospital, Xenia

Grandview Hospital, Dayton

Good Samaritan Hospital, Dayton

David L. Rike Cancer Center at Miami Valley Hospital, Dayton

Samaritan North Cancer Care Center, Dayton

Veterans Affairs Medical Center - Dayton, Dayton

CCOP - Dayton, Dayton

Charles F. Kettering Memorial Hospital, Kettering

Mercy Medical Center, Springfield

Community Hospital of Springfield and Clark County, Springfield

Adena Regional Medical Center, Chillicothe

Strecker Cancer Center at Marietta Memorial Hospital, Marietta

Lima Memorial Hospital, Lima

Blanchard Valley Medical Associates, Findlay

St. Francis Hospital and Health Centers - Beech Grove Campus, Beech Grove

Community Hospital, Munster

Center for Cancer Therapy at LaPorte Hospital and Health Services, La Porte

Saint Anthony Memorial Health Centers, Michigan City

Elkhart General Hospital, Elkhart

CCOP - Northern Indiana CR Consortium, South Bend

Memorial Hospital of South Bend, South Bend

Saint Joseph Regional Medical Center, South Bend

Howard Community Hospital, Kokomo

Reid Hospital & Health Care Services, Richmond

Bloomington Hospital Regional Cancer Institute, Bloomington

William Beaumont Hospital - Royal Oak Campus, Royal Oak

Haematology-Oncology Associates of Ohio and Michigan, PC, Lambertville

Community Cancer Center of Monroe, Monroe

Mercy Memorial Hospital - Monroe, Monroe

Borgess Medical Center, Kalamazoo

Bronson Methodist Hospital, Kalamazoo

Battle Creek Health System Cancer Care Center, Battle Creek

Lakeland Regional Cancer Care Center - St. Joseph, Saint Joseph

Oncology Care Associates, PLLC, Saint Joseph

Hickman Cancer Center at Bixby Medical Center, Adrian

Mecosta County Medical Center, Big Rapids

Holland Community Hospital, Holland

Green Bay Oncology, Limited - Escanaba, Escanaba

Hackley Hospital, Muskegon

Butterworth Hospital at Spectrum Health, Grand Rapids

CCOP - Grand Rapids, Grand Rapids

Lacks Cancer Center at Saint Mary's Health Care, Grand Rapids

Metro Health Hospital, Grand Rapids

Munson Medical Center, Traverse City

Dickinson County Healthcare System, Iron Mountain

Mercy Cancer Center at Mercy Medical Center - North Iowa, Mason City

Cedar Valley Medical Specialists, PC - West Ridgeway Avenue, Waterloo

Covenant Cancer Treatment Center, Waterloo

Siouxland Hematology-Oncology Associates, LLP, Sioux City

Mercy Medical Center - Sioux City, Sioux City

St. Luke's Regional Medical Center, Sioux City

Heartland Oncology and Hematology, Council Bluffs

Cedar Rapids Oncology Associates, Cedar Rapids

McCreery Cancer Center at Ottumwa Regional, Ottumwa

Hematology Oncology Associates of the Quad Cities, Bettendorf

Genesis Regional Cancer Center at Genesis Medical Center, Davenport

Genesis Medical Center - West Campus, Davenport

Medical Consultants, Limited, Milwaukee

All Saints Cancer Center at Wheaton Franciscan Healthcare, Racine

Bay Area Cancer Care Center at Bay Area Medical Center, Marinette

Green Bay Oncology, Limited - Oconto Falls, Oconto Falls

Green Bay Oncology, Limited - Sturgeon Bay, Sturgeon Bay

Green Bay Oncology, Limited at St. Mary's Hospital, Green Bay

St. Mary's Hospital Medical Center - Green Bay, Green Bay

University of Wisconcin Cancer Center at Aspirus Wausau Hospital, Wausau

Gundersen Lutheran Cancer Center at Gundersen Lutheran Medical Center, La Crosse

Central Wisconsin Cancer Program at Agnesian HealthCare, Fond du Lac

CCOP - Duluth, Duluth

Miller - Dwan Medical Center, Duluth

St. Luke's Hospital Cancer Care Center, Duluth

Mayo Clinic Cancer Center, Rochester

CentraCare Clinic - River Campus, Saint Cloud

Coborn Cancer Center, Saint Cloud

Alexandria

Fergus Falls

MeritCare Bemidji, Bemidji

CCOP - MeritCare Hospital, Fargo

MeritCare Broadway, Fargo

Altru Cancer Center at Altru Hospital, Grand Forks

Bismarck Cancer Center, Bismarck

Medcenter One Hospital Cancer Care Center, Bismarck

Mid Dakota Clinic, PC, Bismarck

St. Alexius Medical Center Cancer Center, Bismarck

CCOP - Montana Cancer Consortium, Billings

Hematology-Oncology Centers of the Northern Rockies - Billings, Billings

Northern Rockies Radiation Oncology Center, Billings

St. Vincent Healthcare Cancer Care Services, Billings

Great Falls Clinic - Main Facility, Great Falls

St. Peter's Hospital, Helena

St. James Healthcare Cancer Care, Butte

Bozeman Deaconess Cancer Center, Bozeman

Community Medical Center, Missoula

Montana Cancer Center at St. Patrick Hospital and Health Sciences Center, Missoula

Glacier Oncology, PLLC, Kalispell

Kalispell Medical Oncology at KRMC, Kalispell

Kalispell Regional Medical Center, Kalispell

Delnor Community Hospital - Geneva, Geneva

Joliet Oncology-Hematology Associates, Limited - West, Joliet

Rush-Copley Cancer Care Center, Aurora

Rush University Medical Center, Chicago

Resurrection Medical Center, Chicago

Provena St. Mary's Regional Cancer Center - Kankakee, Kankakee

Community Hospital of Ottawa, Ottawa

Oncology Hematology Associates of Central Illinois, PC - Ottawa, Ottawa

Illinois Valley Community Hospital, Peru

Perry Memorial Hospital, Princeton

St. Margaret's Hospital, Spring Valley

Galesburg Clinic, PC, Galesburg

Galesburg Cottage Hospital, Galesburg

Kewanee Hospital, Kewanee

McDonough District Hospital, Macomb

Graham Hospital, Canton

Eureka Community Hospital, Eureka

Cancer Treatment Center at Pekin Hospital, Pekin

Proctor Hospital, Peoria

CCOP - Illinois Oncology Research Association, Peoria

Oncology Hematology Associates of Central Illinois, PC - Peoria, Peoria

Methodist Medical Center of Illinois, Peoria

OSF St. Francis Medical Center, Peoria

St. Joseph Medical Center, Bloomington

Hopedale Medical Complex, Hopedale

BroMenn Regional Medical Center, Normal

Community Cancer Center, Normal

Carle Cancer Center at Carle Foundation Hospital, Urbana

CCOP - Carle Cancer Center, Urbana

Memorial Hospital, Carthage

Mason District Hospital, Havana

Siteman Cancer Center at Barnes-Jewish Hospital - Saint Louis, St Louis

CCOP - Kansas City, Kansas City

CCOP - Cancer Research for the Ozarks, Springfield

St. John's Regional Health Center, Springfield

Hulston Cancer Center at Cox Medical Center South, Springfield

Cancer Center of Kansas, PA - Chanute, Chanute

Cancer Center of Kansas, PA - El Dorado, El Dorado

Cancer Center of Kansas, PA - Salina, Salina

Cancer Center of Kansas, PA - Kingman, Kingman

Cancer Center of Kansas, PA - Newton, Newton

Cancer Center of Kansas, PA - Pratt, Pratt

Cancer Center of Kansas, PA - Wellington, Wellington

Cancer Center of Kansas, PA - Winfield, Winfield

Associates in Womens Health, PA - North Review, Wichita

Cancer Center of Kansas, PA - Medical Arts Tower, Wichita

Cancer Center of Kansas, PA - Wichita, Wichita

CCOP - Wichita, Wichita

Via Christi Cancer Center at Via Christi Regional Medical Center, Wichita

Cancer Center of Kansas, PA - Parsons, Parsons

Cancer Center of Kansas, PA - Dodge City, Dodge City

Southwest Medical Center, Liberal

CCOP - Missouri Valley Cancer Consortium, Omaha

Methodist Estabrook Cancer Center, Omaha

Immanuel Medical Center, Omaha

Alegant Health Cancer Center at Bergan Mercy Medical Center, Omaha

Cancer Resource Center - Lincoln, Lincoln

Arkansas Cancer Research Center at University of Arkansas for Medical Sciences, Little Rock

Hembree Mercy Cancer Center at St. Edward Mercy Medical Center, Fort Smith

Oklahoma University Cancer Institute, Oklahoma City

Cancer Care Associates - Mercy Campus, Oklahoma City

Cleo Craig Cancer Research Clinic, Lawton

CCOP - Scott and White Hospital, Temple

Poudre Valley Hospital, Fort Collins

Front Range Cancer Specialists, Fort Collins

Welch Cancer Center at Sheridan Memorial Hospital, Sheridan

Snake River Oncology of Eastern Idaho PLLC, Idaho Falls

Kootenai Cancer Center - Coeur d'Alene, Coeur d'Alene

Glendale Memorial Hospital Comprehensive Cancer Center, Glendale

Providence Saint Joseph Medical Center - Burbank, Burbank

Desert Regional Medical Center Comprehensive Cancer Center, Palm Springs

Peninsula Medical Center, Burlingame

Kaiser Permanente Medical Center - Redwood City, Redwood City

Kaiser Permanente Medical Center - South San Francisco, South San Francisco

Kaiser Permanente Medical Center - San Francisco Geary Campus, San Francisco

California Pacific Medical Center - California Campus, San Francisco

North Bay Cancer Center, Fairfield

Kaiser Permanente - Fremont, Fremont

Kaiser Permanente Medical Center - Hayward, Hayward

Kaiser Permanente Medical Center - Vallejo, Vallejo

Sutter Solano Medical Center, Vallejo

Kaiser Permanente Medical Center - Walnut Creek, Walnut Creek

Kaiser Permanente Medical Center - Oakland, Oakland

Alta Bates Summit Comprehensive Cancer Center, Berkeley

Kaiser Permanente Medical Center - Richmond, Richmond

Kaiser Foundation Hospital - San Rafael, San Rafael

California Cancer Care, Incorporated - Greenbrae, Greenbrae

Marin Cancer Institute at Marin General Hospital, Greenbrae

Sutter Health - Western Division Cancer Research Group, Greenbrae

Kaiser Permanente Medical Center - Santa Clara Kiely Campus, Santa Clara

Kaiser Permanente Medical Center - Santa Teresa, San Jose

Kaiser Permanente Medical Facility - Stockton, Stockton

Kaiser Permanente Medical Center - Santa Rosa, Santa Rosa

CCOP - Santa Rosa Memorial Hospital, Santa Rosa

Kaiser Permanente Medical Center - Roseville, Roseville

South Sacramento Kaiser-Permanente Medical Center, Sacramento

Kaiser Permanente Medical Center - Sacramento, Sacramento

Cascade Cancer Center at Evergreen Hospital Medical Center, Kirkland

Valley Medical Center, Renton

CCOP - Virginia Mason Research Center, Seattle

Group Health Central Hospital, Seattle

St. Joseph Cancer Center, Bellingham

Olympic Medical Center, Port Angeles

Fairbanks Cancer Treatment Center at Fairbanks Memorial Hospital, Fairbanks

Mayo Clinic Scottsdale, Scottsdale

USC/Norris Comprehensive Cancer Center and Hospital, Los Angeles

Evanston Northwestern Healthcare - Evanston Hospital, Evanston

Advocate Christ Medical Center, Oak Lawn

Swedish-American Regional Cancer Center, Rockford

Central Baptist Hospital, Lexington

Central Maine Comprehensive Cancer Center at Central Maine Medical Center, Lewiston

Mercy Hospital, Portland

Tufts-NEMC Cancer Center, Boston

Massachusetts General Hospital, Boston

Dana-Farber/Harvard Cancer Center at Dana Farber Cancer Institute, Boston

Beth Israel Deaconess Medical Center, Boston

Addison Gilbert Hospital, Gloucester

NSMC Cancer Center - Peabody, Peabody

West Michigan Cancer Center, Kalamazoo

Duluth Clinic Cancer Center - Duluth, Duluth

Billings Clinic - Downtown, Billings

Montana Cancer Specialists at Montana Cancer Center, Missoula

Good Samaritan Cancer Center at Good Samaritan Hospital, Kearney

Creighton University Medical Center, Omaha

New Hampshire Oncology - Hematology, PA at Payson Center for Cancer Care, Concord

Center for Cancer Care at Exeter Hospital, Exeter

New Hampshire Oncology - Hematology, PA - Hooksett, Hooksett

Kingsbury Center for Cancer Care at Cheshire Medical Center, Keene

Lakes Region General Hospital, Laconia

Elliot Regional Cancer Center at Elliot Hospital, Manchester

Hunterdon Regional Cancer Center at Hunterdon Medical Center, Flemington

CCOP - Northern New Jersey, Hackensack

St. Barnabas Medical Center Cancer Center, Livingston

Fox Chase Virtua Health Cancer Program at Virtua Memorial Hospital Marlton, Marlton

Carol G. Simon Cancer Center at Morristown Memorial Hospital, Morristown

Warren Hospital, Phillipsburg

Overlook Hospital, Summit

Fox Chase Virtua Health Cancer Program at Virtua West Jersey, Voorhees Township

Presbyterian Cancer Center at Presbyterian Hospital, Charlotte

Summa Center for Cancer Care at Akron City Hospital, Akron

Aultman Cancer Center at Aultman Hospital, Canton

Case Comprehensive Cancer Center, Cleveland

Riverside Methodist Hospital Cancer Care, Columbus

Middletown Regional Hospital, Franklin

UVMC Cancer Care Center at Upper Valley Medical Center, Troy

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

Geisinger Cancer Institute at Geisinger Health, Danville

Penn State Cancer Institute at Milton S. Hershey Medical Center, Hershey

Cancer Center of Paoli Memorial Hospital, Paoli

Mountainview Medical, Berlin Corners

Fletcher Allen Health Care - University Health Center Campus, Burlington

University Cancer Center at University of Washington Medical Center, Seattle

Oncology Alliance, SC - Milwaukee - East, Glendale

Green Bay Oncology, Limited at St. Vincent Hospital Regional Cancer Center, Green Bay

St. Vincent Hospital Regional Cancer Center, Green Bay

University of Wisconsin Paul P. Carbone Comprehensive Cancer Center, Madison

Aurora Sinai Medical Center, Milwaukee

British Columbia Cancer Agency - Vancouver Cancer Centre, Vancouver

CancerCare Manitoba, Winnipeg

Moncton Hospital, Moncton

Saint John Regional Hospital, Saint John

Cambridge Memorial Hospital, Cambridge

Algoma District Cancer Program at Sault Area Hospital, Sault Ste. Marie

Cancer Care Program at Thunder Bay Regional Health Sciences, Thunder Bay

Edmond Odette Cancer Centre at Sunnybrook, Toronto

St. Michael's Hospital - Toronto, Toronto

Princess Margaret Hospital, Toronto

Hopital Charles Lemoyne, Greenfield Park

Hopital du Saint-Sacrement - Quebec, Québec

Allan Blair Cancer Centre at Pasqua Hospital, Regina