A Study of Tobemstomig + Nab-Paclitaxel Compared With Pembrolizumab + Nab-Paclitaxel in Participants With Previously Untreated, PD-L1-Positive, Locally-Advanced Unresectable or Metastatic Triple-Negative Breast Cancer

Running, not enrolling · Phase 2

Conditions studied: Breast Cancer

In brief

The purpose of this study is to assess the efficacy and safety of a novel immunotherapy candidate, tobemstomig, in combination with nab-paclitaxel, for patients with previously untreated, locally advanced, unresectable or metastatic (Stage IV) programmed death-ligand 1 (PD-L1)-positive triple-negative breast cancer (TNBC).

Key facts

Study ID: NCT05852691
Run by: Hoffmann-La Roche
People needed: 83
Starts: 2023-07-18
Expected to finish: 2026-10-31
Last updated by the study team: 2026-06-11

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Metastatic or locally advanced unresectable, histologically documented triple-negative breast cancer (TNBC) (absence of HER2-over-expression, ER, and PgR expression by local assessment)
HER2-low-status
Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1
If metastatic disease (Stage IV), measurable disease outside of the bone
No prior systemic therapy for metastatic or locally advanced unresectable TNBC
Tumor PD-L1 expression as documented through central testing of a representative tumor tissue specimen
Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1
Adequate hematologic and end-organ function
Negative HIV test at screening, with the following exception: individuals with a positive HIV test at screening are eligible provided they are stable on anti-retroviral therapy, have a CD4 count ≥ 200/uL, and have an undetectable viral load
Negative hepatitis B surface antigen (HBsAg) test at screening
Positive hepatitis B surface antibody (HBsAb) test at screening, or a negative HBsAb at screening accompanied by either of the following: negative hepatitis B core antibody (HBcAb); positive HBcAb test followed by quantitative hepatitis B virus (HBV) DNA < 500 IU/mL
Negative hepatitis C virus (HCV) antibody test at screening, or a positive HCV antibody test followed by a negative HCV RNA test at screening
Adequate cardiovascular function

You may not qualify if…

Pregnancy or breastfeeding, or intention of becoming pregnant during the study or within 4 months after the final dose of tobemstomig or pembrolizumab, and 6 months after the final dose of nab-paclitaxel
Poor venous access
History of malignancy within 5 years prior to consent, except for the cancer under investigation in this study and malignancies with a negligible risk of metastasis or death (e.g., 5-year OS rate >90%), such as adequately treated carcinoma in situ of the cervix, nonmelanoma skin carcinoma, localized prostate cancer, ductal carcinoma in situ, or Stage I uterine cancer
Symptomatic, untreated, or actively progressing central nervous system (CNS) metastases
History of leptomeningeal disease
Pleural effusion, pericardial effusion, or ascites requiring recurrent drainage procedures (once monthly or more frequently)
Hypercalcemia or hypercalcemia that is symptomatic
Active or history of autoimmune disease or immune deficiency, including, but not limited to, myasthenia gravis, myositis, autoimmune hepatitis, systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, antiphospholipid antibody syndrome, Wegener granulomatosis (granulomatosis with polyangiitis), Sjögren syndrome, Guillain-Barré syndrome, or multiple sclerosis
History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or 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
Active tuberculosis (TB)
Significant cardiovascular/cerebrovascular disease within 3 months prior to consent
History or presence of an abnormal ECG that is deemed clinically significant
History of ventricular dysrhythmias or risk factors for ventricular dysrhythmias such as structural heart disease (e.g., severe left ventricular systolic dysfunction, left ventricular hypertrophy), coronary heart disease (symptomatic or with ischemia demonstrated by diagnostic testing), clinically significant electrolyte abnormalities (e.g., hypokalemia, hypomagnesemia, hypocalcemia), or family history of sudden unexplained death or long QT syndrome
Major surgical procedure within 4 weeks prior to initiation of study treatment
Treatment with therapeutic oral or IV antimicrobials (anti-bacterial, anti-fungal, antiviral, anti-parasitic) within 1 week prior to initiation of study treatment
Prior allogeneic stem cell or solid organ transplantation
Any other disease, metabolic dysfunction, physical examination finding, or clinical laboratory finding that contraindicates the use of an investigational drug, may affect the interpretation of the results, or may render the participant at high risk from treatment complications
Treatment with a live, attenuated vaccine within 28 days prior to initiation of study treatment
Treatment with investigational therapy within 28 days prior to initiation of study treatment
Prior treatment with CD137 agonists or anti-CTLA therapeutic antibodies or an anti-LAG3 agent
Treatment with systemic immunostimulatory agents (including, but not limited to, interferon and IL-2) within 4 weeks or 5 drug-elimination half-lives (whichever is longer) prior to initiation of study treatment
Treatment with systemic corticosteroids or other systemic immunosuppressive medications (including, but not limited to, prednisone, dexamethasone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-TNF agents) within 2 weeks prior to initiation of study treatment
History of severe allergic anaphylactic reactions to chimeric or humanized antibodies or fusion proteins
Known hypersensitivity to Chinese hamster ovary cell products or to any component of the tobemstomig or pembrolizumab formulation
Known allergy or hypersensitivity to any component of the to nab-paclitaxel formulation

Where it is running

Hadassah University Hospital - Ein Kerem — Jerusaelm, Israel
Sheba Medical Center — Ramat Gan, Israel
Cancer Blood and Specialty Clinic — Los Alamitos, California, United States
Memorial Sloan-Kettering Cancer Center — New York, New York, United States
Novant Health Presbyterain Medical Center — Charlotte, North Carolina, United States
Avera Cancer Institute — Sioux Falls, South Dakota, United States
Centro de Investigaciones Médicas y Desarrollo LC S.R.L — Buenos Aires, Argentina
Sunshine Hospital — St Albans, Victoria, Australia
Hospital Araujo Jorge — Goiânia, Goiás, Brazil
Hospital do Cancer de Pernambuco - HCP — Recife, Pernambuco, Brazil
Hospital de Cancer de Barretos — Barretos, São Paulo, Brazil
Clinica de Pesquisa e Centro de Estudos em Oncologia Ginecologica e Mamaria Ltda — São Paulo, São Paulo, Brazil
Fakultni Thomayerova nemocnice — Praha 4 - Krc, Czechia
Klinikum Essen-Mitte Ev. Huyssens-Stiftung / Knappschafts GmbH — Essen, Germany
Dres. Andreas Köhler und Roswitha Fuchs — Langen, Germany
Universitätsklinikum Ulm Am Michelsberg — Ulm, Germany
Komarom-Eszergom Varmegyei Szent Borbala Korhaz — Tatabánya, Hungary
Ospedale Provinciale Santa Maria Delle Croci — Ravenna, Emilia-Romagna, Italy
Ospedale San Raffaele — Milan, Lombardy, Italy
Health Pharma Professional Research — Mexico City, Mexico CITY (federal District), Mexico
OncoMed — Mexico City, Mexico CITY (federal District), Mexico
Centro Médico Zambrano Hellion — Monterrey, Nuevo León, Mexico
Centro de Investigacion Clinica de Oaxaca — Oaxaca City, Oaxaca, Mexico
Centro Medico Monte Carmelo — Arequipa, Peru
Oncosalud Sac — Lima, Peru

Full record on ClinicalTrials.gov

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