A Study to Assess Adverse Events of Intravenously (IV) Infused ABBV-383 in Adult Participants With Relapsed or Refractory Multiple Myeloma ETENTAMIG

What's the purpose of this trial?

This is a study to determine adverse events and change in disease symptoms of ABBV-383 in adult participants with relapsed/refractory (R/R) MM. 

This trial is currently open and accepting patients.

What will happen during the trial?

Multiple Myeloma (MM) is a cancer of the blood's plasma cells ( blood cell). The cancer is typically found in the bones and bone marrow (the spongy tissue inside of the bones) and can cause bone pain, fractures, infections, weaker bones, and kidney failure. Treatments are available, but MM can come back (relapsed) or may not get better (refractory) with treatment. This is a study to determine adverse events and change in disease symptoms of ABBV-383 in adult participants with relapsed/refractory (R/R) MM.

ABBV-383 is an investigational drug being developed for the treatment of R/R Multiple Myeloma (MM). This study is broken into 2 Arms; Arm A (Parts 1 and 2) and Arm B. Arm A includes 2 parts: step-up dose optimization (Part 1) and dose expansion (Part 2). In Part 1, different level of step-up doses are tested followed by the target dose of ABBV-383. In Part 2, the step-up dose identified in Part 1 (Dose A) will be used followed by the target dose A of ABBV-383. In Arm B a flat dose of ABBV-383 will be tested. Around 120 adult participants with relapsed/refractory multiple myeloma will be enrolled at approximately 30 sites across the world.

Participants will receive ABBV-383 as an infusion into the vein in 28 day cycles for approximately 3 years.

There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects and questionnaires.

You may be able to join this trial if you:

The following criteria is a partial list of reasons why patients may be eligible to participate in this clinical trial. Further evaluation with a medical professional is required.

Inclusion Criteria:

  • Must have measurable disease as outlined in the protocol.
  • Eastern Cooperative Oncology Group (ECOG) performance of <= 2.
  • Relapsed/refractory (R/R) multiple myeloma (MM) with documented evidence of progression during or after the participant's last treatment regimen based on the investigator's determination of the International Myeloma Working Group (IMWG) 2016 criteria.
  • Must be naïve to treatment with ABBV-383.
  • Arm A: Must have received at least 3 or more lines of therapy, including a proteasome inhibitor (PI), an immunomodulatory imide drug (IMiD), and an anti-CD38 monoclonal antibody.
  • Arm B: Must have received at least 2 or more lines of therapy, including exposure to a PI, an IMiD, an anti-CD38 monoclonal antibody, and a prior B-cell maturation antigen (BCMA)-targeted therapy (anti-drug conjugate [ADC] or chimeric antigen receptor T-cell [CAR-T] directed against BCMA).

Exclusion Criteria:

  • Arm A: Received BCMA-targeted therapy.

Additional Trial Information

Phase 1

Enrollment: 180 patients (estimated)

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Published Results

A Phase 1b Study of Step-up Dosing with ABBV-383, a B-Cell Maturation Antigen (BCMA) x CD3 Bispecific Antibody, in Patients with Relapsed or Refractory Multiple Myeloma

December 07, 2024

Results: As of April 2024, 70 pts were enrolled in Arm A: 47 in DO (2 mg SUD, n=26; 4 mg SUD, n=21) and 23 in DE. Median age was 69 years (range: 40–84), 59% were male, and 76% were triple-class refractory. Median prior lines of therapy was 4 (range: 3–10). Median follow-up time (months [mo]) was 6.5, 7.5, and 2.8 for 2 mg DO, 4 mg DO, and DE, respectively. Any grade CRS was reported in 10 (39%) and 11 (52%) pts during DO at 2 and 4 mg SUD; CRS grade ≥2 occurred in 3 (12%) pts in the 2 mg SUD and in 6 (29%) pts in the 4 mg SUD, leading to selection of 2 mg SUD for DE. In the DE, 7 (30%) pts experienced CRS; 1 (4%) pt experienced grade 2 CRS, there were no grade ≥3 events, and only 2 (9%) pts received tocilizumab to treat CRS. Overall, median time to CRS onset and resolution was 14.7 and 9 hours, respectively; no pts had CRS after C1. Immune effector cell-associated neurotoxicity syndrome occurred in 7 (10%) pts (grade 1: 4%; grade 2: 6%; grade 3: 4%). Most common TEAEs were CRS (40%), neutropenia (37%), diarrhea (29%), anemia (24%), and fatigue (20%); most common grade 3/4 TEAEs were neutropenia (31%), anemia (19%), thrombocytopenia (13%), and leukopenia (11%). Grade 5 TEAEs occurred in 5 pts; 1 event was deemed possibly related to ABBV-383 (COVID-19 pneumonia). In the efficacy-evaluable population (n=68), the objective response rate was 62% (95% CI: 49.2, 73.3); 35 (52%) pts had a VGPR or better. Median time to response was 1.1 mo (range: 1–4) and median duration of follow-up was 5.8 mo (range: 1–12). Response rates are expected to improve with longer follow-up. Maximum reduction in peak levels of CRS-related cytokines, including IL-6, were observed in DE compared with DO and 60 mg Q4W without SUD (FIH study). Peak activation and proliferation of CD8 T cells was comparable with ABBV-383 in DO, DE, and 60 mg Q4W-treated pts.

Conclusions: Introduction of 1 SUD of 2 mg on D1 followed by full dose of 60 mg on D4 in C1 combined with modification to the Dex premed schedule reduced the incidence and severity of CRS in pts with RRMM, further optimizing the safety profile of ABBV-383. Preliminary efficacy data show early and high response rates, consistent with outcomes from other ABBV-383 studies.

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Trial Locations

All Trial Locations

View all clinical trial locations sorted by state.

Arizona

Mayo Clinic (Arizona)

Phoenix, AZ

Open and Accepting

Colorado

Rocky Mountain Cancer Centers

Aurora, CO

Open and Accepting

Illinois

Hope and Healing Cancer Services

Hinsdale, IL

Open and Accepting

Indiana

Fort Wayne Medical Oncology and Hematology (Fort Wayne North) Fort Wayne North Office

Fort Wayne, IN

Open and Accepting

Louisiana

Tulane Cancer Center Tulane University School of Medicine

New Orleans, LA

Open and Accepting

Minnesota

Mayo Clinic (Rochester)

Rochester, MN

Open and Accepting

Nebraska

Nebraska Hematology Oncology

Lincoln, NE

Open and Accepting

New Jersey

Memorial Sloan Kettering Basking Ridge

Basking Ridge, NJ

Open and Accepting

Memorial Sloan Kettering Monmouth

Middletown, NJ

Open and Accepting

Memorial Sloan Kettering Bergen

Montvale, NJ

Open and Accepting

New York

Memorial Sloan Kettering Cancer Center

New York, NY

Open and Accepting

Memorial Sloan Kettering Commack

Commack, NY

Open and Accepting

Mount Sinai Hospital Tisch Cancer Institute

New York, NY

Open and Accepting

Memorial Sloan Kettering Nassau

Uniondale, NY

Open and Accepting

Memorial Sloan Kettering Westchester

West Harrison, NY

Open and Accepting

North Carolina

UNC Lineberger Comprehensive Cancer Center University of North Carolina

Chapel Hill, NC

Open and Accepting

Wake Forest Baptist - Comprehensive Cancer Center Atrium Health

Winston-Salem, NC

Open and Accepting

Oregon

Willamette Valley Cancer Institute (Eugene)

Eugene, OR

Open and Accepting

Tennessee

Vanderbilt-Ingram Cancer Center Henry-Joyce Cancer Clinic

Nashville, TN

Open and Accepting

Texas

Oncology Consultants PA

Houston, TX

Open and Accepting

Washington

Fred Hutchinson Cancer Research Center University of Washington Cancer Consortium / SCCA

Seattle, WA

Open and Accepting

Northwest Medical Specialties (Tacoma) NWMS Tacoma — Medical Oncology & Infectious Diseases

Tacoma, WA

Open and Accepting
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