ShortStop-HER2: 12 Months vs. 6 Months of HER2-targeted Medications for People With HER2+ Breast Cancer Who Had a Pathologic Complete Response After Chemotherapy Plus Trastuzumab

Roswell Park Cancer Institute, Buffalo

Thomas Jefferson University Hospital, Philadelphia

Christiana Care Health System-Concord Health Center, Chadds Ford

Helen F Graham Cancer Center, Newark

Medical Oncology Hematology Consultants PA, Newark

Christiana Care Health System-Christiana Hospital, Newark

Christiana Care Health System-Wilmington Hospital, Wilmington

Beebe Medical Center, Lewes

Beebe South Coastal Health Campus, Millville

Beebe Health Campus, Rehoboth Beach

MedStar Georgetown University Hospital, Washington D.C.

MedStar Washington Hospital Center, Washington D.C.

MedStar Montgomery Medical Center, Olney

Greater Baltimore Medical Center, Baltimore

MedStar Franklin Square Medical Center/Weinberg Cancer Institute, Baltimore

MedStar Good Samaritan Hospital, Baltimore

Christiana Care - Union Hospital, Elkton

Bon Secours Westchester Emergency Center, Midlothian

Bon Secours Saint Francis Medical Center, Midlothian

Bon Secours Memorial Regional Medical Center, Mechanicsville

Bon Secours Richmond Community Hospital, Richmond

Bon Secours Saint Mary's Hospital, Richmond

Bon Secours Cancer Institute at Reynolds Crossing, Richmond

Edwards Comprehensive Cancer Center, Huntington

Novant Health Colon and Rectal Clinic, Clemmons

Novant Health Cancer Institute - Mount Airy, Mount Airy

Novant Health Forsyth Medical Center, Winston-Salem

Novant Health Cancer Institute - Kernersville, Kernersville

Novant Health Cancer Institute - Thomasville, Thomasville

Novant Health Breast Surgery - Greensboro, Greensboro

Novant Health Cancer Institute - Huntersville, Huntersville

Novant Health Presbyterian Medical Center Huntersville, Huntersville

Matthews Radiation Oncology Center, Matthews

Novant Health Cancer Institute - Matthews, Matthews

Novant Health Cancer Institute - Mooresville, Mooresville

Novant Health Cancer Institute - Rowan, Salisbury

Rowan Regional Medical Center, Salisbury

Novant Health Presbyterian Medical Center, Charlotte

FirstHealth of the Carolinas-Moore Regional Hospital, Pinehurst

Novant Health Cancer Institute - Statesville, Statesville

Novant Health Cancer Institute - Wilkesboro, North Wilkesboro

Margaret R Pardee Memorial Hospital, Hendersonville

Lexington Medical Center, West Columbia

Sacred Heart Hospital, Pensacola

Jupiter Medical Center, Jupiter

Flaget Memorial Hospital, Bardstown

Saint Joseph Mount Sterling, Mount Sterling

Saint Joseph Hospital, Lexington

Saint Joseph Radiation Oncology Resource Center, Lexington

Saint Joseph Hospital East, Lexington

Commonwealth Cancer Center-Corbin, Corbin

Saint Joseph London, London

Aultman Alliance Community Hospital, Alliance

Aultman Health Foundation, Canton

Good Samaritan Hospital - Cincinnati, Cincinnati

Bethesda North Hospital, Cincinnati

TriHealth Cancer Institute-Westside, Cincinnati

TriHealth Cancer Institute-Anderson, Cincinnati

UChicago Medicine Northwest Indiana, Crown Point

OSF Saint Francis Hospital and Medical Group, Escanaba

Mary Greeley Medical Center, Ames

McFarland Clinic - Ames, Ames

McFarland Clinic - Boone, Boone

McFarland Clinic - Jefferson, Jefferson

McFarland Clinic - Marshalltown, Marshalltown

McFarland Clinic - Trinity Cancer Center, Fort Dodge

Mercy Hospital, Cedar Rapids

Oncology Associates at Mercy Medical Center, Cedar Rapids

HSHS Saint Nicholas Hospital, Sheboygan

Saint Vincent Hospital Cancer Center at Sheboygan, Sheboygan

Sheboygan Physicians Group, Sheboygan

Saint Vincent Hospital Cancer Center at Oconto Falls, Oconto Falls

Saint Vincent Hospital Cancer Center Green Bay, Green Bay

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

Rapid City Regional Hospital, Rapid City

Billings Clinic Cancer Center, Billings

Benefis Sletten Cancer Institute, Great Falls

Great Falls Clinic, Great Falls

Hi-Line Sletten Cancer Center, Havre

Community Hospital of Anaconda, Anaconda

Bozeman Health Deaconess Hospital, Bozeman

Community Medical Center, Missoula

Logan Health Medical Center, Kalispell

Northwestern Medicine Glenview Outpatient Center, Glenview

Northwestern Medicine Grayslake Outpatient Center, Grayslake

Northwestern Medicine Lake Forest Hospital, Lake Forest

Northwestern Medicine Cancer Center Kishwaukee, DeKalb

Northwestern Medicine Cancer Center Delnor, Geneva

UC Comprehensive Cancer Center at Silver Cross, New Lenox

Northwestern Medicine Orland Park, Orland Park

University of Chicago Medicine-Orland Park, Orland Park

Northwestern Medicine Oak Brook, Oak Brook

Northwestern Medicine Cancer Center Warrenville, Warrenville

Northwestern University, Chicago

University of Chicago Comprehensive Cancer Center, Chicago

Illinois CancerCare-Dixon, Dixon

Illinois CancerCare-Ottawa Clinic, Ottawa

Illinois CancerCare-Peru, Peru

Valley Radiation Oncology, Peru

Illinois CancerCare-Princeton, Princeton

Illinois CancerCare-Galesburg, Galesburg

Illinois CancerCare-Kewanee Clinic, Kewanee

Illinois CancerCare-Macomb, Macomb

Illinois CancerCare-Canton, Canton

Illinois CancerCare-Eureka, Eureka

Illinois CancerCare-Pekin, Pekin

Illinois CancerCare - Washington, Washington

Illinois CancerCare-Peoria, Peoria

Methodist Medical Center of Illinois, Peoria

Illinois CancerCare-Bloomington, Bloomington

OSF Saint Anthony's Health Center, Alton

Cancer Care Center of O'Fallon, O'Fallon

HSHS Saint Elizabeth's Hospital, O'Fallon

Illinois CancerCare-Carthage, Carthage

Crossroads Cancer Center, Effingham

Cancer Care Specialists of Illinois - Decatur, Decatur

Decatur Memorial Hospital, Decatur

Southern Illinois University School of Medicine, Springfield

Springfield Clinic, Springfield

Springfield Memorial Hospital, Springfield

Centralia Oncology Clinic, Centralia

Saint Mary's Hospital, Centralia

SSM Health Good Samaritan, Mount Vernon

Memorial Hospital of Carbondale, Carbondale

SIH Cancer Institute, Carterville

Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin

Missouri Baptist Sullivan Hospital, Sullivan

Mercy Hospital Washington, Washington

Mercy Infusion Center - Chippewa, St Louis

BJC Outpatient Center at Sunset Hills, Sunset Hills

Mercy Hospital South, St Louis

Missouri Baptist Medical Center, St Louis

Mercy Hospital Saint Louis, St Louis

Parkland Health Center - Farmington, Farmington

Sainte Genevieve County Memorial Hospital, Sainte Genevieve

Mercy Cancer Center - Cape Girardeau, Cape Girardeau

Saint Francis Medical Center, Cape Girardeau

Heartland Regional Medical Center, Saint Joseph

Freeman Health System, Joplin

Mercy Hospital Joplin, Joplin

Lake Regional Hospital, Osage Beach

Mercy Clinic-Rolla-Cancer and Hematology, Rolla

Phelps Health Delbert Day Cancer Institute, Rolla

Central Care Cancer Center - Bolivar, Bolivar

Cox Cancer Center Branson, Branson

Mercy Hospital Springfield, Springfield

CoxHealth South Hospital, Springfield

Cancer Center of Kansas - Chanute, Chanute

Mercy Hospital Pittsburg, Pittsburg

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

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

Central Care Cancer Center - Great Bend, Great Bend

Cancer Center of Kansas - Dodge City, Dodge City

Central Care Cancer Center - Garden City, Garden City

Cancer Center of Kansas-Liberal, Liberal

Alegent Health Immanuel Medical Center, Omaha

Alegent Health Bergan Mercy Medical Center, Omaha

Alegent Health Lakeside Hospital, Omaha

Creighton University Medical Center, Omaha

CHI Health Saint Francis, Grand Island

CHI Health Good Samaritan, Kearney

CARTI Cancer Center, Little Rock

Mercy Hospital Fort Smith, Fort Smith

Mercy Hospital Oklahoma City, Oklahoma City

Saint Anthony North Hospital, Westminster

Saint Anthony Hospital, Lakewood

Longmont United Hospital, Longmont

Penrose-Saint Francis Healthcare, Colorado Springs

Rocky Mountain Cancer Centers-Penrose, Colorado Springs

Saint Francis Cancer Center, Colorado Springs

Saint Mary Corwin Medical Center, Pueblo

CommonSpirit Cancer Center Mercy, Durango

Mercy Medical Center, Durango

Billings Clinic-Cody, Cody

Kootenai Health - Coeur d'Alene, Coeur d'Alene

Kootenai Clinic Cancer Services - Post Falls, Post Falls

Kootenai Clinic Cancer Services - Sandpoint, Sandpoint

Cancer Center at Saint Joseph's, Phoenix

Pacific Central Coast Health Center-San Luis Obispo, San Luis Obispo

Mission Hope Medical Oncology - Arroyo Grande, Arroyo Grande

Mission Hope Medical Oncology - Santa Maria, Santa Maria

Saint Joseph's Medical Center, Stockton

Mercy Cancer Center, Merced

Mercy Cancer Center - Carmichael, Carmichael

Mercy San Juan Medical Center, Carmichael

Woodland Memorial Hospital, Woodland

Mercy Cancer Center - Elk Grove, Elk Grove

Mercy Cancer Center - Rocklin, Rocklin

Mercy Cancer Center - Sacramento, Sacramento

Legacy Mount Hood Medical Center, Gresham

Legacy Meridian Park Hospital, Tualatin

Legacy Good Samaritan Hospital and Medical Center, Portland

Saint Michael Cancer Center, Silverdale

Legacy Cancer Institute Medical Oncology and Day Treatment, Vancouver

Legacy Salmon Creek Hospital, Vancouver

Saint Vincent Hospital Cancer Center at Sturgeon Bay, Sturgeon Bay