ATEMPT 2.0: Adjuvant T-DM1 vs TH

NCT ID: NCT04893109

Last Updated: 2025-11-13

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE2

Total Enrollment

500 participants

Study Classification

INTERVENTIONAL

Study Start Date

2021-06-16

Study Completion Date

2028-05-01

Brief Summary

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This research study is studying how well newly diagnosed breast cancer that has tested positive for a protein called HER2 responds using one of two different combination of HER2-directed therapies as a treatment after surgery.

The name of the study drugs involved are:

* Trastuzumab-emtansine (T-DM1, Kadcyla)
* Trastuzumab SC (Herceptin Hylecta)
* Paclitaxel

Detailed Description

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This is a randomized phase II adjuvant study for women and men with Stage I HER2-positive invasive breast cancer. Participants will be randomized into one of two treatment arms in this study and receive:

* Arm 1: trastuzumab-emtansine (T-DM1, Kadcyla) and trastuzumab SC (Herceptin Hylecta)
* Arm 2: paclitaxel and trastuzumab SC (Herceptin Hylecta) This research study is looking to see if the study drug T-DM1 followed by trastuzumab SC will have less side-effects than traditional HER2-positive breast cancer treatment of trastuzumab and paclitaxel.The study is also looking to learn about the long-term benefits and disease-free survival of participants who are treated with T-DM1 followed by trastuzumab SC.

T-DM1 is an antibody-drug conjugate; it is made up of an antibody (trastuzumab) linked to a cytotoxic drug, DM1 (chemotherapy). T-DM1 functions as a targeted cancer therapy because it targets HER2-positive breast cancer cells directly, limiting exposure of the rest of the body to chemotherapy. More specifically, the trastuzumab in T-DM1 first binds to the HER2 protein on the surface of the breast cancer cells and the DM1 then enters the cells and can cause them to die, preventing tumor growth. The FDA (the U.S. Food and Drug Administration) has not approved T-DM1 for use on its own in patients with stage I, II, or III breast cancer. However, it has been approved for use in (a) advanced or metastatic, previously treated breast cancer and (b) in some patients receiving postoperative treatment after preoperative chemotherapy and surgery have been completed.

Trastuzumab SC is a subcutaneous form of trastuzumab.Trastuzumab is a monoclonal antibody, which are disease-fighting proteins made by cloned immune cells. Paclitaxel and trastuzumab are considered a standard-of-care regimen in early breast cancer. Trastuzumab is FDA-approved to be administered as an IV (intravenous) or subcutaneous (muscular injection).

The research study procedures include screening for eligibility and study treatment including laboratory evaluations and follow up visits.

Participants will receive study treatment for a year in total and will be followed for 5 years after treatment.

It is expected that about 500 people will take part in this research study.

Genentech is supporting this research study by providing funding for the study and supplying trastuzumab-emtansine (T-DM1) and trastuzumab SC (subcutaneous).

Conditions

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Breast Cancer HER2-positive Breast Cancer

Keywords

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Breast Cancer HER2-positive Breast Cancer

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

participants are randomized in a 2-1 fashion to Arm A vs. Arm B
Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Arm A. T-DM1 followed by Trastuzumab SC

Randomized participants will receive intravenous T-DM1 every 3 weeks for 6 cycles (18 weeks) and then Trastuzumab SC (subcutaneous) every 3 weeks for 11 cycles

Group Type EXPERIMENTAL

trastuzumab-emtansine

Intervention Type DRUG

intravenous infusion

Trastuzumab SC

Intervention Type DRUG

Muscular injection

Arm B: Paclitaxel with Trastuzumab SC, followed by Trastuzumab SC alone

Randomized participants will receive weekly intravenous Paclitaxel for 12 weeks (4 cycles) and Trastuzumab SC (subcutaneous) every 3 weeks for 17 cycles. The first 4 doses Trastuzumab SC are given with Paclitaxel.

Group Type EXPERIMENTAL

Trastuzumab SC

Intervention Type DRUG

Muscular injection

Paclitaxel

Intervention Type DRUG

intravenous infusion

Interventions

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trastuzumab-emtansine

intravenous infusion

Intervention Type DRUG

Trastuzumab SC

Muscular injection

Intervention Type DRUG

Paclitaxel

intravenous infusion

Intervention Type DRUG

Other Intervention Names

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T-DM1 Kadcyla Herceptin Hylecta Taxol Onxal

Eligibility Criteria

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Inclusion Criteria

* Patients must have HER2-positive Stage I histologically confirmed invasive carcinoma of the breast. Patients must have node-negative (N0) or micrometastases (N1mic) breast cancer according to the AJCC 8th edition anatomic staging table.

* If the patient has had a negative sentinel node biopsy, then no further axillary dissection is required, and the patient is determined to be node-negative. If an axillary dissection without sentinel lymph node biopsy is performed to determine nodal status, at least six axillary lymph nodes must be removed and analyzed, and determined to be negative, for the patient to be considered node-negative. Axillary nodes with single cells or tumor clusters ≤ 0.2 mm by either H\&E or immunohistochemistry (IHC) will be considered node-negative.
* Any axillary lymph node with tumor clusters between 0.02 and 0.2 cm is considered a micrometastasis. Patients with a micrometastasis are eligible. An axillary dissection is not required to be performed in patients with a micrometastasis found by sentinel node evaluation. In cases where the specific pathologic size of lymph node involvement is subject to interpretation, the principal investigator will make the final determination as to eligibility. The investigator must document approval in the patient medical record.
* Patients who have an area of a T1aN0, ER+ (defined as \>10%), HER2-negative cancer in addition to their primary HER2-positive tumor are eligible.
* HER2-positive by ASCO CAP 2018 guidelines, confirmed by central testing. NOTE: HER-2 status must be confirmed to be positive by central review by NeoGenomics prior to patient starting protocol therapy. Patients previously having had HER2 immunohistochemical testing by NeoGenomics do not need to undergo retesting for central confirmation of HER2 status.

NOTE: DCIS components will not be counted in the determination of HER2 status

* ER/PR determination is required. ER and PR assays should be performed by immunohistochemical methods according to the local institution standard protocol.
* Bilateral breast cancers that individually meet eligibility criteria are allowed.
* Patients with multifocal or multicentric disease are eligible, as long as each tumor individually meets eligibility criteria. Central confirmation is needed for any site of disease that is tested to be HER2-positive by local testing (unless testing was previously done by NeoGenomics).
* Patients with a history of ipsilateral DCIS are eligible if they were treated with wide excision alone, without radiation therapy, or treated with a mastectomy for this current breast cancer. Patients with a history of contralateral DCIS are not eligible.
* ≤ 90 days between the planned treatment start date and the patient's most recent breast surgery for this breast cancer
* ≥ 18 years of age with any menopausal status.
* ECOG Performance Status 0 or 1
* All tumor should be removed by either a modified radical mastectomy or a segmental mastectomy (lumpectomy), with either a sentinel node biopsy or axillary dissection

* All margins should be clear of invasive cancer or DCIS (i.e. no tumor on ink). The local pathologist must document negative margins of resection in the pathology report. If all other margins are clear, a positive posterior (deep) margin is permitted, provided the surgeon documents that the excision was performed down to the pectoral fascia and all tumor has been removed. Likewise, if all other margins are clear, a positive anterior (superficial; abutting skin) margin is permitted provided the surgeon documents that all tumor has been removed.
* Patients undergoing breast conservation therapy (i.e. lumpectomy) must not have any contraindications to radiation therapy. Radiation to the conserved breast is required.
* Patients may have received up to 4 weeks of tamoxifen therapy, or other hormonal therapy, for adjuvant therapy for this cancer. Patients cannot receive adjuvant hormonal therapy during protocol treatment for the first 12 weeks.
* Prior oophorectomy for cancer prevention is allowed.
* Patients who have undergone partial breast radiation (duration ≤ 14 days) prior to registration are eligible. Partial breast radiation must be completed prior to 2 weeks before starting protocol therapy. Patients who have undergone whole breast radiation are not eligible.
* Patients who have participated in a window study (treatment with an investigational agent prior to surgery for ≤ 2 weeks) are eligible. Patients must have discontinued the investigational agent at least 14 days before participation.
* Adequate bone marrow function:

* ANC ≥ 1000/mm3,
* Hemoglobin ≥ 9 g/dl
* Platelets ≥ 100,000/mm3
* Adequate hepatic function:

* Total bilirubin ≤ 1.2mg/dL
* AST and ALT ≤ 1.5x Institutional ULN
* For patients with Gilbert syndrome, the direct bilirubin should be within the institutional normal range. Serum alkaline phosphatase should be ≤ 1.5x Institutional ULN.
* Left ventricular ejection fraction (LVEF) ≥ 50%
* Premenopausal patients must have a negative serum or urine pregnancy test, including women who have had a tubal ligation and for women less than 12 months after the onset of menopause.
* Women of childbearing potential and men with partners of childbearing potential must be willing to use one highly effective form of nonhormonal contraception or two effective forms of nonhormonal contraception by the patient and/or partner. Contraceptive use must be continued for the duration of the study treatment and for 7 months after the last dose of study treatment. Hormonal birth control methods are not permitted.
* Patients should have tumor tissue available, and a tissue block of sufficient size to make 15 slides, which must be sent to DFCI for correlative research. If a tissue block is unavailable, sites may send one H\&E-stained slide and 15 unstained sections of paraffin-embedded tissue on uncharged slides. Slide sections should be 4-5 microns in thickness. It is also acceptable to submit 2 cores from a block of invasive tissue using a 1.2 mm diameter coring tool. If tumor is not available, the investigator must document why tissue is not available in the patient medical record, and that efforts have been made to obtain tissue.
* Willing and able to sign informed consent
* Must be able to read and understand English in order to participate in the quality of life surveys. If patient does not read and understand English, the patient is still eligible, but cannot participate in the quality of life surveys.

Exclusion Criteria

* Any of the following due to teratogenic potential of the study drugs:

* Pregnant women
* Nursing women
* Women of childbearing potential who are unwilling to employ adequate contraception (condoms, diaphragms, IUDs, surgical sterilization, abstinence, etc.).
* Men who are unwilling to employ adequate contraception (condoms, surgical sterilization, abstinence, etc.).
* Locally advanced tumors at diagnosis, including tumors fixed to the chest wall, peau d'orange, skin ulcerations/nodules, or clinical inflammatory changes (diffuse brawny cutaneous induration with an erysipeloid edge)
* Patients with a history of previous invasive breast cancer.
* History of prior chemotherapy in the past 5 years.
* History of paclitaxel therapy
* Patients with active liver disease, for example due to hepatitis B virus, hepatitis C virus, autoimmune hepatic disorder, or sclerosing cholangitis
* Individuals with a history of a different malignancy are ineligible except for the following circumstances:

* Individuals with a history of other malignancies are eligible if they have been disease-free for at least 5 years and are deemed by the investigator to be at low risk for recurrence of that malignancy.
* Individuals with the following cancer are eligible regardless of when they were diagnosed and treated: cervical cancer in situ, and non-melanoma cancer of the skin.
* Intercurrent illness including, but not limited to: ongoing or active, unresolved systemic infection, renal failure requiring dialysis, active cardiac disease, prior myocardial infarction (asymptomatic changes on EKG suggestive of old MI is not an exclusion), history of CHF, current use of any therapy specifically for CHF, uncontrolled hypertension, significant psychiatric illness, or other conditions that in the opinion of the investigator limit compliance with study requirements.
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Genentech, Inc.

INDUSTRY

Sponsor Role collaborator

Dana-Farber Cancer Institute

OTHER

Sponsor Role lead

Responsible Party

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Sara Tolaney, MD

Principal Investigator

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Sara Tolaney, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

Dana-Farber Cancer Institute

Locations

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UCSF Helen Diller Family Comprehensive Cancer Center

San Francisco, California, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Derby

Derby, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Fairfield

Fairfield, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Glastonbury

Glastonbury, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Greenwich

Greenwich, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Guilford

Guilford, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at St. Francis

Hartford, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Long Ridge

Long Ridge, Connecticut, United States

Site Status RECRUITING

Yale Cancer Center at Yale University School of Medicine

New Haven, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at North Haven

North Haven, Connecticut, United States

Site Status RECRUITING

Stamford Hospital

Stamford, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Torrington

Torrington, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Trumbull

Trumbull, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Waterbury

Waterbury, Connecticut, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Waterford

Waterford, Connecticut, United States

Site Status RECRUITING

Miami Cancer Institute/Baptist Hospital of Miami

Miami, Florida, United States

Site Status RECRUITING

Miami Cancer Institute - Plantation (MCIP)

Plantation, Florida, United States

Site Status RECRUITING

The University of Chicago Medical Center

Chicago, Illinois, United States

Site Status RECRUITING

Indiana University Health Joe & Shelly Schwarz Cancer Center

Carmel, Indiana, United States

Site Status ACTIVE_NOT_RECRUITING

IU Health North Hospital

Carmel, Indiana, United States

Site Status ACTIVE_NOT_RECRUITING

Indiana University Melvin and Bren Simon Comprehensive Cancer Center

Indianapolis, Indiana, United States

Site Status ACTIVE_NOT_RECRUITING

Indiana University Sidney and Lois Eskenazi Hospital

Indianapolis, Indiana, United States

Site Status ACTIVE_NOT_RECRUITING

Eastern Maine Medical Center (Northern Light)

Brewer, Maine, United States

Site Status RECRUITING

New England Cancer Specialists

Scarborough, Maine, United States

Site Status RECRUITING

Beth Israel Deaconess Medical Center

Boston, Massachusetts, United States

Site Status RECRUITING

Dana Farber Cancer Institute

Boston, Massachusetts, United States

Site Status RECRUITING

Massachusetts General Hospital

Boston, Massachusetts, United States

Site Status RECRUITING

Dana-Farber at St. Elizabeth's Medical Center

Brighton, Massachusetts, United States

Site Status RECRUITING

Mass General North Shore Cancer Center

Danvers, Massachusetts, United States

Site Status RECRUITING

Dana-Farber Brigham Cancer Center - Foxborough

Foxborough, Massachusetts, United States

Site Status RECRUITING

Dana-Farber Cancer Instiute - Merrimack Valley

Methuen, Massachusetts, United States

Site Status RECRUITING

Dana-Farber at Milford

Milford, Massachusetts, United States

Site Status RECRUITING

Newton Wellesley Hospital

Newton, Massachusetts, United States

Site Status RECRUITING

Berkshire Medical Center

Pittsfield, Massachusetts, United States

Site Status RECRUITING

Dana Farber at South Shore Hospital

Weymouth, Massachusetts, United States

Site Status RECRUITING

NH Oncology-Hematology, PA - Payson Center for Cancer Care

Concord, New Hampshire, United States

Site Status RECRUITING

Dana-Farber Cancer Insitute at Londonderry Hospital

Londonderry, New Hampshire, United States

Site Status RECRUITING

Solinsky Center for Cancer Care (NH Oncology-Hematology, PA)

Manchester, New Hampshire, United States

Site Status RECRUITING

New England Cancer Specialists - Portsmouth

Portsmouth, New Hampshire, United States

Site Status RECRUITING

New York University Langone Hospital -Brooklyn

Brooklyn, New York, United States

Site Status RECRUITING

New York University Langone Hospital - Long Island

Mineola, New York, United States

Site Status RECRUITING

New York University Langone Health

New York, New York, United States

Site Status RECRUITING

Northwell University

New York, New York, United States

Site Status RECRUITING

Duke University Medical Center

Durham, North Carolina, United States

Site Status ACTIVE_NOT_RECRUITING

Duke Women's Cancer Care Raleigh

Raleigh, North Carolina, United States

Site Status ACTIVE_NOT_RECRUITING

Stefanie Spielman Comprehensive Breast Center

Columbus, Ohio, United States

Site Status RECRUITING

University of Pennsylvania, Abramson Cancer Center

Philadelphia, Pennsylvania, United States

Site Status RECRUITING

Smilow Cancer Hospital Care center at Westerly

Westerly, Rhode Island, United States

Site Status RECRUITING

Greco-Hainsworth Centers for Research/Tennessee Oncology

Nashville, Tennessee, United States

Site Status RECRUITING

SCRI Oncology Partners

Nashville, Tennessee, United States

Site Status RECRUITING

MD Anderson Cancer Center

Houston, Texas, United States

Site Status RECRUITING

Countries

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United States

Central Contacts

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Sara Tolaney, MD, PhD

Role: CONTACT

Phone: 617-632-2335

Email: [email protected]

Facility Contacts

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Hope Rugo, MD

Role: primary

Clinical Trial Offcie Yale Cancer Center

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

Clinical Trial Office Yale Cancer Center

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

Clinical Trial Office Yale Cancer Center

Role: primary

Clinical Trial Office Yale Cancer Center

Role: primary

Clinical Trial Office Yale Center

Role: primary

Clinical Trial Office Clinical Trials Office - Yale Cancer Center

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

K.M. Steve Lo, MD

Role: primary

Clinical Trial Office Yale Cancer Center

Role: primary

Clinical Trials Office Cancer Trial

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

Reshma Mahtani, DO

Role: primary

Reshma Mahtani, DO

Role: primary

Susan Cohn, MD

Role: primary

Laurie Lewis

Role: primary

Rachael Farris

Role: primary

Nadine Tung, MD

Role: primary

Sara M. Tolaney, MD MPH

Role: primary

Laura Spring, MD

Role: primary

Wendy Loeser

Role: primary

Meegan Petersen

Role: primary

Natalie Sinclair

Role: primary

Saida Hussein

Role: primary

Natalie Sinclair, MD

Role: primary

Natassia Mazzola

Role: primary

Lori O'Brien

Role: primary

Meredith Faggen

Role: primary

Role: backup

Ali Fleury

Role: primary

Stefani Freeman, RN

Role: primary

Ali Fleury

Role: primary

NECS Research

Role: primary

Breast Cancer Center

Role: primary

Mehwash "Mahi" Muhammad

Role: primary

Sylvia Adams, MD

Role: primary

Francisco Esteva

Role: primary

Breast Cancer Clinical Trials

Role: primary

Igor Makhlin, MD

Role: primary

Clinical Trials Office Yale Cancer Center

Role: primary

PJ Patterson

Role: primary

Lisa Simons

Role: primary

Vicente Valero, MD

Role: primary

Other Identifiers

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21-159

Identifier Type: -

Identifier Source: org_study_id