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A Study to Investigate Atezolizumab and Chemotherapy Compared With Placebo and Chemotherapy in the Neoadjuvant Setting in Participants With Early Stage Triple Negative Breast Cancer

Trial Status: Closed to Accrual

This is a global Phase III, double-blind, randomized, placebo-controlled study designed to evaluate the efficacy and safety of neoadjuvant treatment with atezolizumab (anti-programmed death-ligand 1 [anti-PD-L1] antibody) and nab-paclitaxel followed by doxorubicin and cyclophosphamide (nab-pac-AC), or placebo and nab-pac-AC in participants eligible for surgery with initial clinically assessed triple-negative breast cancer (TNBC).

Inclusion Criteria

  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
  • Histologically documented TNBC (negative human epidermal growth factor receptor 2 [HER2], estrogen receptor [ER], and progesterone receptor [PgR] status)
  • Confirmed tumor programmed death-ligand 1 (PD-L1) evaluation as documented through central testing of a representative tumor tissue specimen
  • Primary breast tumor size of greater than (>) 2 centimeters (cm) by at least one radiographic or clinical measurement
  • Stage at presentation: cT2-cT4, cN0-cN3, cM0
  • Participant agreement to undergo appropriate surgical management including axillary lymph node surgery and partial or total mastectomy after completion of neoadjuvant treatment
  • Baseline left ventricular ejection fraction (LVEF) greater than or equal to (>=) 53 percent (%) measured by echocardiogram (ECHO) or multiple-gated acquisition (MUGA) scans
  • Adequate hematologic and end-organ function
  • Representative formalin-fixed, paraffin-embedded (FFPE) tumor specimen in paraffin blocks (preferred) or at least 20 unstained slides, with an associated pathology report documenting ER, PgR, and HER2 negativity
  • For women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive methods, and agreement to refrain from donating eggs
  • For men: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive measures and agreement to refrain from donating sperm
  • Women who are not postmenopausal or have undergone a sterilization procedure must have a negative serum pregnancy test result within 14 days prior to initiation of study drug

Exclusion Criteria

  • Prior history of invasive breast cancer
  • Stage 4 (metastatic) breast cancer
  • Prior systemic therapy for treatment and prevention of breast cancer
  • Previous therapy with anthracyclines or taxanes for any malignancy
  • History of ductal carcinoma in situ (DCIS), except for participants treated exclusively with mastectomy >5 years prior to diagnosis of current breast cancer
  • History of pleomorphic lobular carcinoma in situ (LCIS), except for participants surgically managed >5 years prior to diagnosis of current breast cancer
  • Bilateral breast cancer
  • Undergone incisional and/or excisional biopsy of primary tumor and/or axillary lymph nodes
  • Axillary lymph node dissection prior to initiation of neoadjuvant therapy
  • History of other malignancy within 5 years prior to screening, with the exception of those with a negligible risk of metastasis or death
  • Cardiopulmonary dysfunction
  • History of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric or humanized antibodies or fusion proteins
  • Known hypersensitivity to biopharmaceuticals produced in Chinese hamster ovary cells
  • Known allergy or hypersensitivity to the components of the formulations of atezolizumab, nab-paclitaxel, cyclophosphamide, or doxorubicin, filgrastim or pegfilgrastim
  • Active or history of autoimmune disease or immune deficiency diseases except history of autoimmune-related hypothyroidism, controlled Type 1 diabetes mellitus, and dermatologic manifestations of eczema, psoriasis, lichen simplex chronicus, or vitiligo (e.g., participants with psoriatic arthritis are excluded)
  • History of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis on screening chest computed tomography (CT) scan. History of radiation pneumonitis in the radiation field (fibrosis) is permitted
  • Positive human immunodeficiency virus (HIV) test at screening
  • Active hepatitis B and hepatitis C virus infection
  • Active tuberculosis
  • Severe infections within 4 weeks prior to initiation of study treatment, including but not limited to hospitalization for complications of infection, bacteremia, or severe pneumonia
  • Treatment with therapeutic oral or IV antibiotics within 2 weeks prior to initiation of study treatment, except prophylactic antibiotics
  • Major surgical procedure within 4 weeks prior to initiation of study treatment or anticipation of need for a major surgical procedure during the course of the study
  • Prior allogeneic stem cell or solid organ transplantation
  • Administration of a live attenuated vaccine within 4 weeks prior to initiation of study treatment or anticipation of need for such a vaccine during the study
  • Any other disease, metabolic dysfunction, physical examination finding, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or that may affect the interpretation of the results or render the participant at high risk from treatment complications
  • Prior treatment with cluster of differentiation 137 (CD137) agonists or immune checkpoint-blockade therapies, including anti-cluster of differentiation 40 (anti-CD40), anti-cytotoxic T-lymphocyte-associated protein 4 (anti-CTLA-4), anti-programmed death-1 (anti-PD-1), and anti-PD-L1 therapeutic antibodies
  • Treatment with systemic immunostimulatory agents within 4 weeks or 5 half-lives of the drug, whichever is longer, prior to initiation of study treatment
  • Treatment with systemic immunosuppressive medications within 2 weeks prior to initiation of study treatment or anticipation of need for systemic immunosuppressive medications during the study
  • History of cerebrovascular accident within 12 months prior to randomization
  • Pregnant or lactating, or intending to become pregnant during the study


Palo Alto
Stanford Cancer Institute Palo Alto

New York

Montefiore Medical Center-Einstein Campus
New York
Memorial Sloan Kettering Cancer Center
Contact: Elizabeth Anne Comen
Phone: 646-888-5104


Vanderbilt University / Ingram Cancer Center

Trial Phase Phase III

Trial Type Treatment

Lead Organization
Hoffmann-La Roche

  • Primary ID WO39392
  • Secondary IDs NCI-2018-00261, 2016-004734-22
  • ID NCT03197935