ATEMPT 2.0: Adjuvant T-DM1 vs TH — StellaPhase 2 — Testing in a larger group (up to a few hundred people) to further evaluate safety and begin to assess effectiveness.
Trial locations(52 sites)
United States
UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, California Smilow Cancer Hospital Care center at Derby, Derby, Connecticut Smilow Cancer Hospital Care center at Fairfield, Fairfield, Connecticut Smilow Cancer Hospital Care center at Glastonbury, Glastonbury, Connecticut Smilow Cancer Hospital Care center at Greenwich, Greenwich, Connecticut Smilow Cancer Hospital Care center at Guilford, Guilford, Connecticut Smilow Cancer Hospital Care center at St. Francis, Hartford, Connecticut Smilow Cancer Hospital Care center at Long Ridge, Long Ridge, Connecticut Yale Cancer Center at Yale University School of Medicine, New Haven, Connecticut Smilow Cancer Hospital Care center at North Haven, North Haven, Connecticut Stamford Hospital, Stamford, Connecticut Smilow Cancer Hospital Care center at Torrington, Torrington, Connecticut Smilow Cancer Hospital Care center at Trumbull, Trumbull, Connecticut Smilow Cancer Hospital Care center at Waterbury, Waterbury, Connecticut Smilow Cancer Hospital Care center at Waterford, Waterford, Connecticut Miami Cancer Institute/Baptist Hospital of Miami, Miami, Florida Miami Cancer Institute - Plantation (MCIP), Plantation, Florida The University of Chicago Medical Center, Chicago, Illinois Indiana University Health Joe & Shelly Schwarz Cancer Center, Carmel, Indiana IU Health North Hospital, Carmel, Indiana Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indianapolis, Indiana Indiana University Sidney and Lois Eskenazi Hospital, Indianapolis, Indiana Eastern Maine Medical Center (Northern Light), Brewer, Maine New England Cancer Specialists, Scarborough, Maine Beth Israel Deaconess Medical Center, Boston, Massachusetts Dana Farber Cancer Institute, Boston, Massachusetts Massachusetts General Hospital, Boston, Massachusetts Dana-Farber at St. Elizabeth's Medical Center, Brighton, Massachusetts Mass General North Shore Cancer Center, Danvers, Massachusetts Dana-Farber Brigham Cancer Center - Foxborough, Foxborough, Massachusetts Dana-Farber Cancer Instiute - Merrimack Valley, Methuen, Massachusetts Dana-Farber at Milford, Milford, Massachusetts Newton Wellesley Hospital, Newton, Massachusetts Berkshire Medical Center, Pittsfield, Massachusetts Dana Farber at South Shore Hospital, Weymouth, Massachusetts NH Oncology-Hematology, PA - Payson Center for Cancer Care, Concord, New Hampshire Dana-Farber Cancer Insitute at Londonderry Hospital, Londonderry, New Hampshire Solinsky Center for Cancer Care (NH Oncology-Hematology, PA), Manchester, New Hampshire New England Cancer Specialists - Portsmouth, Portsmouth, New Hampshire New York University Langone Hospital -Brooklyn, Brooklyn, New York New York University Langone Hospital - Long Island, Mineola, New York New York University Langone Health, New York, New York Northwell University, New York, New York Duke University Medical Center, Durham, North Carolina Duke Women's Cancer Care Raleigh, Raleigh, North Carolina Stefanie Spielman Comprehensive Breast Center, Columbus, Ohio University of Pennsylvania, Abramson Cancer Center, Philadelphia, Pennsylvania University of Pittsburgh Medical Center Cancer UPMC- Magee Women's Hospital, Pittsburgh, Pennsylvania Smilow Cancer Hospital Care center at Westerly, Westerly, Rhode Island Greco-Hainsworth Centers for Research/Tennessee Oncology, Nashville, Tennessee SCRI Oncology Partners, Nashville, Tennessee MD Anderson Cancer Center, Houston, Texas Last updated February 2026