Single-arm Study of IgPro20 in Adults With Secondary Immune Deficiencies Due to Hematologic Malignancies Treated With B-cell Targeting Chimeric Antigen Receptor T-cell and T-cell Redirecting Therapies

Starting soon · Phase 3

Conditions studied: Secondary Immune Deficiency

In brief

This is a prospective, multicenter, open-label, single-arm study to assess the efficacy, safety, and pharmacokinetics (PK) of IgPro20 in adults with hematologic malignancies treated with B-cell targeting Chimeric antigen receptor T-cell (CAR T-cell) and T-cell redirecting therapies (such as T-cell engager bispecific antibody \[TCE BsAb\] therapy). The primary objective is to demonstrate that true annualized rate of serious bacterial infection (SBIs) is less than (\<) 1.0. This study includes two cohorts: 1. Loading Cohort: Participants with serum immunoglobulin G (IgG) \< 500 milligrams per deciliter (mg/dL) at Screening, with or without ongoing immunoglobulin replacement therapy (IgRT) during Screening, who must have received five doses of IgPro20 during the Initial Treatment Period. 2. Maintenance-only Cohort: Participants with serum IgG greater than or equal to (≥) 500 mg/dL and ongoing IgRT at Screening, who must have received one dose of IgPro20 during the Initial Treatment Period.

Key facts

Study ID

NCT07648264

Run by

CSL Behring

People needed

63

Starts

2026-07-24

Expected to finish

2029-02-16

Last updated by the study team

2026-07-22

Who can join

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

You may qualify if…

• Participants greater than or equal to (≥) 18 years of age at the time of providing written informed consent.
• Confirmed diagnosis of B-cell hematologic malignancy (ie, Multiple myeloma [MM], Chronic lymphocytic leukemia [CLL], Non-Hodgkin lymphoma [NHL], or BALL) according to applicable diagnostic criteria.
• Participants treated with Chimeric antigen receptor T-cell (CAR T-cell) therapy or TCE BsAb and are:
• At least 2 months after receipt of an approved CAR T-cell therapy for the B-cell hematologic malignancy at the time of Screening, or
• At least 1 month after initiation of an approved TCE BsAb therapy for the B-cell hematologic malignancy at the time of Screening and expected to continue with the therapy.
• Documented partial or complete response to CAR T-cell or TCE BsAb therapy based on applicable response criteria at the time of Screening:
• CLL based on International Workshop on Chronic Lymphocytic Leukemia response criteria
• MM based on International Myeloma Working Group response criteria
• NHL based on Lugano Classification criteria
• B-ALL based on National Comprehensive Cancer Network guidelines
• IgG level (excluding paraprotein, if relevant) at Screening:
• If participant has ongoing IgRT (intravenous immunoglobulin [IVIG] or subcutaneous immunoglobulin [SCIG]) for SID during Screening, then any IgG level at Screening is acceptable for enrollment. Participants with IgG less than (<) 500 milligrams per deciliter (mg/dL) are assigned to the Loading Cohort, participants with IgG ≥ 500 mg/dL are assigned to the Maintenance-only Cohort.
• IgG level (excluding paraprotein, if relevant) at Screening:
• If participant does not have ongoing IgRT (IVIG for > 8 weeks or SCIG for > 2 weeks) for SID during Screening and are not expected to receive IgRT during Screening, then IgG < 500 mg/dL is required for enrollment (participant is assigned to the Loading Cohort)

You may not qualify if…

• Documented history of diseases for which IgRT may be indicated: primary immune deficiency, chronic inflammatory demyelinating polyneuropathy, Guillain-Barré syndrome, immune thrombocytopenia, Kawasaki disease, Lambert-Eaton myasthenic syndrome, multifocal motor neuropathy, myasthenia gravis, stiff person syndrome, solid organ transplant, and rejection prior to Screening.
• History of thromboembolic event (TEE) within 6 months before Screening.
• Eastern Cooperative Oncology Group performance status > 1.
• Presence of any systemic active infection at Screening.
• Participants on any prohibited therapies, including anti-infective treatments.
• Absolute neutrophil count < 1 × 10*9/L (Common Terminology Criteria for Adverse Events [CTCAE] Grade 3 or worse), unless proven to be due to the underlying disease and raised above the limit by granulocyte colony-stimulating factor.
• Concurrent participation in other interventional clinical studies. Note: a participant may be enrolled if their participation in the other study will not jeopardize their safety and / or the scientific validity of this study (eg, an observational study, a long-term safety follow-up of an interventional study, diagnostic device studies, phase 4 studies with medicines used within their approved indication); the investigator may consult with the medical monitor.

Where it is running

• CBCI, Colorado Blood Cancer Institute — Denver, Colorado, United States
• SSAK Partners — Coral Springs, Florida, United States
• Mayo Clinic - Jacksonville — Jacksonville, Florida, United States
• Indiana University Health Arnett, Inc. — Lafayette, Indiana, United States
• Johns Hopkins Asthma & Allergy Center — Baltimore, Maryland, United States
• American Oncology Partners, PA dba The Center for Cancer and Blood Disorders — Bethesda, Maryland, United States
• Hackensack Meridian Health — Hackensack, New Jersey, United States
• Carol G Simon Cancer Center — Morristown, New Jersey, United States
• David H. Koch Center for Cancer Care — New York, New York, United States
• Montefiore Medical Center PRIME — The Bronx, New York, United States
• Duke University — Durham, North Carolina, United States
• University of Cincinnati Medical Center — Cincinnati, Ohio, United States
• Penn State Hershey Medical Center — Hershey, Pennsylvania, United States
• The University of Texas MD Anderson Cancer Center — Houston, Texas, United States
• Fred Hutchinson Cancer Research Center — Seattle, Washington, United States
• Medical College of Wisconsin — Milwaukee, Wisconsin, United States
• Universitair ziekenhuis Antwerpen UZA — Edegem, Antwerp, Belgium
• AZ Delta — Roeselare, West-Vlaanderen, Belgium
• UZ Gent — Ghent, Belgium
• CHU de Liège — Liège, Belgium
• Horizon Health Network — Fredericton, New Brunswick, Canada
• McGill University Health Research Institute — Montreal, Quebec, Canada
• FH Ostrova — Ostrova, CZE, Czechia
• FH Hradec Kralove — Hradec Králové, Hradec Králové Region, Czechia
• UC Irvine — Orange, California, United States

Full record on ClinicalTrials.gov

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