External Beam Radiation Therapy in Combination With Talquetamab for the Treatment of Multiple Myeloma Patients With Extramedullary Disease

Recruiting now · Phase 1/Phase 2

Conditions studied: Extramedullary Disease in Multiple Myeloma, Multiple Myeloma

In brief

This phase I/II trial tests the safety and effectiveness of extramedullary disease (EMD)-directed external beam radiation therapy (EBRT) in combination with talquetamab for the treatment of multiple myeloma patients with extramedullary disease. Extramedullary disease in multiple myeloma involves the infiltration of organs and soft tissues by malignant plasma cells and has proven difficult to treat. Radiation therapy uses high energy x-rays, particles, or radioactive seeds to kill cancer cells and shrink cancers. EBRT is a type of radiation therapy that delivers high-energy beams to the cancer from outside of the body. In this trial, the EBRT will be directed to a site of extramedullary disease. Talquetamab is a monoclonal antibody that may interfere with the ability of cancer cells to grow and spread. A monoclonal antibody is a type of protein that can bind to certain targets in the body, such as molecules that cause the body to make an immune response (antigens). Combining EMD-directed EBRT with talquetamab may be safe, tolerable, and/or effective in treating multiple myeloma patients with extramedullary disease.

Key facts

Study ID

NCT06572605

Run by

City of Hope Medical Center

People needed

20

Starts

2025-08-29

Expected to finish

2030-01-18

Last updated by the study team

2025-09-19

Who can join

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

You may qualify if…

• Documented informed consent of the participant and/or legally authorized representative
• Assent, when appropriate, will be obtained per institutional guidelines
• Agreement to allow the use of archival tissue from diagnostic tumor biopsies
• If unavailable, exceptions may be granted with study principal investigator (PI) approval
• Age: ≥ 18 years
• Karnofsky performance status (KPS) ≥ 60%
• Diagnosis of multiple myeloma with extramedullary disease (EMD). EMD is defined as soft-tissue plasmacytomas NOT arising from skeletal lesions (i.e., the EMD is not contiguous with any bone/bony lesion)
• Measurable systemic disease defined as serum M-spike ≥ 0.5 g/dl, 24-hour urine M-spike ≥ 200 mg/24 hours (hr), involved serum free light chain (FLC) ≥ 10 mg/dl with abnormal FLC ratio, and/or a non-target plasmacytoma ≥ 2 cm in a single diameter (NOTE: Non-target plasmacytoma must not be included in the EMD-EBRT field)
• At least one site of EMD must have an indication for palliative radiation per the treating clinicians (e.g., including but not limited to pain, asymmetry, discomfort, threatening to vital structure, etc.)
• Target EMD site must be encompassed by one radiation field per treating radiation oncologist
• Subject must have received an immunomodulatory agent, a proteasome inhibitor, and an anti-CD38 antibody
• Fully recovered from the acute non-hematologic toxic effects (except alopecia) to ≤ grade 1 to prior anti-cancer therapy
• Prior antitumor therapy must have been completed prior to enrollment as follows:
• ≥ 2 weeks for prior external beam radiotherapy (XRT) to non-target site
• ≥ 21 days for cytotoxic chemotherapy (systemic or intrathecal)
• ≥ 28 days for prior adoptive cell therapy or T-cell redirecting therapies
• ≥ 4 weeks or 5 half-lives (whichever is shorter) for other myeloma therapies
• Absolute neutrophil count (ANC) ≥ 1,000/mm\^3 (prior growth factor support is permitted but must be without support for 7 days for granulocyte colony-stimulating factor [G-CSF] or granulocyte-macrophage colony-stimulating factor [GM-CSF] and for 14 days for pegylated GCSF before the laboratory test)
• Two repeat tests are allowed. If the repeat test satisfies criteria, the participant may enroll provided all other criteria are met
• Platelets ≥ 50,000/mm\^3
• NOTE: No transfusion support or thrombopoietin receptor agonist within 7 days before laboratory test
• Two repeat tests are allowed. If the repeat test satisfies criteria, the participant may enroll provided all other criteria are met
• Hemoglobin ≥ 8g/dL
• NOTE: No transfusion support or erythropoietin use within 7 days before the laboratory test
• Two repeat tests are allowed. If the repeat test satisfies criteria, the participant may enroll provided all other criteria are met

You may not qualify if…

• Prior irradiation to target EMD site or field
• Prior GPRC5D therapy
• Prior radiopharmaceutical therapy
• Patients who have received previous radiation to > 25% of their bone marrow
• Prior allogeneic hematopoietic cell transplantation within the past 6 months or prior autologous hematopoietic cell transplantation within the past 12 weeks
• A maximum cumulative dose of corticosteroids of ≥ 140 mg of prednisone or equivalent within 14-day period before the first dose of study drug (does not include pre-treatment medications)
• Major surgery within 2 weeks prior to the start of administration of study treatment, or will not have fully recovered from surgery, or has major surgery planned during the time the participant is expected to be treated in the study, or within 2 weeks after administration of the last dose of study treatment
• Note: Participants with planned surgical procedures to be conducted under local anesthesia may participate. Kyphoplasty or vertebroplasty are not considered major surgery. If there is a question whether a procedure is considered a major surgery, the investigator must consult with the appropriate representative at Janssen and resolve any issues before enrolling a participant in the study
• Ongoing or active infection
• Severe persistent asthma or severe chronic obstructive pulmonary disease (COPD)
• Presence of the following cardiac conditions:
• New York Heart Association stage III or IV congestive heart failure
• Myocardial infarction or coronary artery bypass graft ≤ 6 months prior to randomization
• Uncontrolled cardiac arrhythmia or clinically significant electrocardiogram (ECG) abnormalities
• History of clinically significant ventricular arrhythmia or unexplained syncope, not believed to be vasovagal in nature or due to dehydration
• History of severe non-ischemic cardiomyopathy
• Any of the following:
• Hepatitis B infection (i.e., hepatitis B virus surface antigen [HBsAg] or hepatitis B virus [HBV]-deoxyribonucleic acid [DNA] positive). In the event the infection status is unclear, quantitative viral levels are necessary to determine the infection status
• Active hepatitis C infection as measured by positive hepatitis C virus [HCV]-ribonucleic acid [RNA] testing. Participants with a history of HCV antibody positivity must undergo HCV-RNA testing. If a participant with history of chronic hepatitis C infection (defined as both HCV antibody and HCV-RNA positive) completed antiviral therapy and has undetectable HCV-RNA for at least 12 weeks following the completion of therapy, the participant is eligible for the study
• Plasma cell leukemia (> 20% circulating plasma cells and/or > 2.0 x 10\^9/L plasma cells) at the time of screening, Waldenström's macroglobulinemia, POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, M-protein, and skin changes), or primary amyloid light chain amyloidosis
• Known active central nervous system (CNS) involvement or exhibits clinical signs of meningeal involvement of multiple myeloma. If either is suspected, negative whole brain MRI and lumbar cytology are required
• Other active malignancy. Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
• Stroke or seizure within 6 months prior to enrollment
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to study agent
• If HIV positive, any of the following:

Where it is running

• City of Hope Medical Center — Duarte, California, United States (enrolling)

Full record on ClinicalTrials.gov

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