Phase 1/2a Study of Belantamab Mafodotin in Relapsed or Refractory AL Amyloidosis

Recruiting now · Phase 1/Phase 2

Conditions studied: AL Amyloidosis, Amyloidosis

In brief

The goal of this study is to test the safety of drug, Belantamab Mafodotin, and see what effects (good and bad) it has on people who take it and have amyloidosis, and to determine the most effective dose of the drug. The study will have 2 phases (parts). The first phase of the study will test different doses of Belantamab Mafodotin. The second phase will test Belantamab Mafodotin at the dose level found to be safe and effective in phase 1

Key facts

Study ID

NCT05145816

Run by

University of Texas Southwestern Medical Center

People needed

37

Starts

2024-02-15

Expected to finish

2027-09-01

Last updated by the study team

2026-05-07

Who can join

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

You may qualify if…

• Participants medically diagnosed with relapsed or refractory Amyloid Light Chain Amyloidosis (AL amyloidosis) with one or more line of treatment as below:
• Must have received a proteosome inhibitor, alkylator and anti-cluster of differentiation 38 (CD38) antibody (e.g., daratumumab - for patients who were eligible to receive in newly diagnosed AL Amyloidosis) and autologous stem cell transplant (for transplant eligible candidates).
• OR
• Failed treatment and/or intolerant/ineligible for above agents
• NOTE: Patients who fail to achieve Partial Hematological Response or better after 2 cycles of induction therapy for newly diagnosed AL Amyloidosis are also eligible.
• Participant must be over 18 years of age inclusive, at the time of signing the informed consent.
• Participant and Disease Characteristics: Patient must have primary systemic AL amyloidosis, histologically confirmed at the initial diagnosis before initiation of 1st-line treatment by positive Congo red stain with green birefringence on polarized light microscopy, Or characteristic appearance by electron microscopy AND confirmatory AL amyloid typing (mass spectrometry-based proteomic analysis or immunofluorescence).
• Patient must have measurable disease within 28 days prior to registration; serum quantitative immunoglobulins (immunoglobulin G (IgG), immunoglobulin A (IgA), and immunoglobulin M (IgM), serum free kappa and lambda, and serum protein electrophoresis (SPEP) with M-protein quantification must be obtained within 14 days prior to registration.
• Measurable disease of amyloid light chain amyloidosis as defined by at least One of the following:
• a. Serum M-protein ≥0.5 g/dL by protein electrophoresis (routine serum protein electrophoresis and immunofixation).
• b. Serum free light chain ≥50 mg/L with an abnormal kappa: lambda ratio or the difference between the involved and uninvolved free light chains (dFLC) ≥50 mg/L.
• One or more organs impacted by AL Amyloidosis according to consensus guidelines below per National Comprehensive Cancer Network (NCCN)Guidelines Version 1.2016:
• a. Cardiac Involvement i. Mean left ventricular wall thickness on echocardiogram greater than or equal to 12 mm in the absence of hypertension or valvular heart disease, OR N-terminal fragment brain natriuretic protein (NT-pro) brain natriuretic peptide (BNP) greater than 332 ng/mL provided that patient does not have impaired renal function (as defined by calculated creatinine clearance less than 25 mL/min) within 14 days prior to registration, OR prior cardiac biopsy (at time of diagnosis) showing amyloid deposition with past documented or presently noted clinical symptoms and signs supportive of a diagnosis of heart failure in the absence of an alternative explanation for heart failure.
• b. Non-Cardiac Organ Involvement
• i. Kidney: albuminuria greater than or equal to 500 mg per day on a 24-hour urine specimen within 35 days prior to registration, OR prior kidney biopsy (at the time of diagnosis) showing amyloid deposition.
• ii. Liver: hepatomegaly (total liver span > 15 cm) as demonstrated by computed tomography (CT) or magnetic resonance imaging (MRI) within 35 days prior to registration OR alkaline phosphatase (ALP) greater than 1.5 times the institutional upper limit of normal within 14 days prior to registration, OR prior liver biopsy (at the time of diagnosis) showing amyloid deposition.
• iii. Gastrointestinal tract: direct biopsy verification with symptoms.
• iv. Lung: biopsy verifications with symptoms and interstitial radiographic pattern.
• v. Soft tissue: tongue enlargement, clinical, arthropathy, claudication, presumed vascular amyloid, skin involvement, carpal tunnel syndrome, myopathy by biopsy or pseudohypertrophy.
• Patients must have completed other systemic therapy or investigational drug ≥ 28 days or five half-lives prior to registration, surgery (other than biopsies) ≥ 28 days prior to registration, and any autologous stem cell transplant (ASCT) ≥ 100 days prior to registration.
• Patients must have a complete medical history and physical exam within 14 days prior to registration.
• New York Heart Association (NYHA) Class 1 - 3a which has been clinically stable for 56 days before registration
• Eastern Cooperative Oncology Group (ECOG) performance score 0, 1 or 2
• Left ventricular ejection fraction (LVEF) by echocardiogram (ECHO) > 35% within 28 days prior to registration.
• Adequate organ system functions within 14 days of registration as defined by the laboratory assessments below:

You may not qualify if…

• Patients previously treated for active symptomatic multiple myeloma.
• Any corneal disease except for mild epithelial punctate keratopathy.
• Patients with known immediate or delayed hypersensitivity reaction or idiosyncratic reactions to belantamab mafodotin or drugs chemically related to belantamab mafodotin, or any of the components of the study treatment.
• Patients eligible for autologous stem cell transplantation (ASCT).
• Evidence of significant cardiovascular condition as specified below:
• N-terminal-prohormone of brain natriuretic peptide (NT-proBNP) ≥ 8500ng/L within 14 days of registration.
• New York Heart Association (NYHA) classification IIIB (3b) through IV (4) heart failure
• Heart failure that in the opinion of the investigator is on the basis of ischemic heart disease (e.g., prior myocardial infarction with documented history of cardiac enzyme elevation and electrocardiogram (ECG) changes) or uncorrected valvular disease and not primarily due to AL amyloid cardiomyopathy
• Unstable heart failure defined as emergency hospitalization for worsening, or decompensated heart failure, or syncopal episode within 1 month of screening
• Subjects with a history of sustained ventricular tachycardia or aborted ventricular fibrillation or with a history of atrioventricular nodal or sinoatrial (SA) nodal dysfunction for which a pacemaker/implantable cardioverter-defibrillator (ICD) is indicated but not placed (Subjects who do have a pacemaker/ICD are allowed on study)
• Interval from the Q wave on the ECG to point T using Fredericia's formula (QTcF) > 500 msec. Subjects who have a pacemaker may be included regardless of calculated QTc interval
• Symptomatic, clinically significant autonomic neuropathy which the Investigator feels will preclude administration of study treatment
• Acute coronary syndrome, or any form of coronary revascularization procedure including coronary artery bypass grafting (CABG), within 6 months of screening
• Prior solid organ transplant, or anticipated to undergo solid organ transplantation, or requiring left ventricular assist device (LVAD) implantation, during the course of the study
• Stroke within 6 months of screening, or transient ischemic attack (TIA) within 3 months of screening
• Evidence of current clinically significant uncontrolled arrhythmias, including clinically significant ECG abnormalities such as 2nd degree (Mobitz Type II) or 3rd degree atrioventricular (AV) block
• History of myocardial infarction, acute coronary syndromes (including unstable angina), coronary angioplasty, or stenting or bypass grafting within three (3) months of Screening
• Uncontrolled hypertension
• Prior history of malignancy with the exception of the following: adequately treated basal cell or squamous cell skin cancer, curatively treated non-melanoma skin cancer, in situ cervical cancer, adequately treated stage I or II cancer from which the patient is currently in complete remission, or any other cancer from which the patient has been disease free for at least two years.
• Presence of any comorbid or uncontrolled medical condition (e.g. uncontrolled hypertension) - defined as defined as an average SBP ≥ 160mm Hg or diastolic ≥ 100mm Hg despite optimal treatment) at screening, which in the opinion of the investigator would increase the potential risk to the subject.
• Unwillingness or inability to follow the procedures outlined in the protocol.
• Received an investigational drug (including investigational vaccines) or used an invasive investigational medical device within 4 weeks or five half-lives, whichever is shorter, before Cycle 1 Day 1.
• Participant must not use contact lenses while participating in this study.
• Participant must not have had major surgery ≤ 4 weeks prior to initiating study treatment.
• Participant must not have any evidence of active mucosal or internal bleeding.

Where it is running

• UT Southwestern Medical Center — Dallas, Texas, United States (enrolling)
• Vanderbilt Ingram Cancer Center — Nashville, Tennessee, United States
• Huntsman Cancer Institute, University of Utah — Salt Lake City, Utah, United States

Full record on ClinicalTrials.gov

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