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NCT Number: NCT07217119

Sub-study of Belantamab Mafodotin (GSK2857916) in Combination With Feladilimab (GSK3359609) in Participants With RRMM

The primary purpose is to determine the safety and tolerability of belantamab mafodotin in combination with feladilimab (GSK3359609), and to establish the recommended Phase 2 dose (RP2D) for the combination treatment to explore in the cohort expansion (CE) phase in participants with RRMM. This study is a sub study of the Master protocol (NCT04126200).

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This study is active but is not currently recruiting participants.

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Key information

Conditions

Multiple Myeloma Blood Protein Disorders Cardiovascular Diseases Hematologic Diseases Hemic and Lymphatic Diseases Hemorrhagic Disorders Hemostatic Disorders Immune System Diseases Immunoproliferative Disorders Lymphoproliferative Disorders Neoplasms Neoplasms by Histologic Type Neoplasms, Plasma Cell Paraproteinemias Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1 / Phase 2

Primary location

GSK Investigational Site, Fitzroy, Victoria, Australia

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participant must be 18 years of age inclusive or older, at the time of signing the informed consent.
  • Participants must have histologically or cytologically confirmed diagnosis of Multiple Myeloma (MM), as defined by the IMWG.
  • Participants having at least 3 prior lines of prior anti-myeloma treatments including an immunomodulating agent (IMID) a proteasome inhibitor (PI) and an anti-CD38 monoclonal antibody.
  • Participants with a history of autologous stem cell transplant are eligible for study participation when, transplant was >100 days prior to study enrolment and with no active infection(s).
  • Participants with Eastern Cooperative Oncology Group (ECOG) performance status of 0-1, unless ECOG less than equal to (<=)2 is due solely to skeletal complications and/or skeletal pain due to MM.
  • Participants with measurable disease defined as at least one of the following: Serum M-protein greater than equal to (>=)0.5 gram per deciliter (>=5 gram per liter) or Urine M-protein >=200 milligrams (mg) per 24 hours or Serum free light chain (FLC) assay: Involved FLC level >=10 mg per deciliter (>=100 mg per Liter) and an abnormal serum FLC ratio (<0.26 or >1.65).
  • Participants who have tested positive for Hepatitis B core antibody (HBcAb) can be enrolled if the following criteria are met: Serology result HBcAb+, Hepatitis B surface antigen (HBsAg)-; HBV deoxyribonucleic acid (DNA) undetectable during screening.
  • Participants who are currently receiving physiological doses oral steroids (<10 mg/day), inhaled steroids or ophthalmalogical steroids.

Exclusion criteria

  • Participants with current corneal epithelial disease except mild punctate keratopathy.
  • Participants with evidence of cardiovascular risk.
  • Participants with known immediate or delayed hypersensitivity reaction or idiosyncrasy to drugs chemically related to belantamab mafodotin or any of the components of the study treatment. History of severe hypersensitivity to other mAb.
  • Participants with active infection requiring antibiotic, antiviral, or antifungal treatment.
  • Participants with other monoclonal antibodies within 30 days or systemic anti-myeloma therapy within <14 days.
  • Participants with prior radiotherapy within 2 weeks of start of study therapy.
  • Participants with prior allogeneic transplant are prohibited.
  • Participants who have received prior Chimeric Antigen T cell therapy (CAR-T) therapy with lymphodepletion with chemotherapy within 3 months of screening.
  • Participants with any major surgery (other than bone-stabilizing surgery) within the last 30 days.
  • Participants with prior treatment with an investigational agent within 14 days or 5 half-lives of receiving the first dose of study drugs, whichever is shorter.
  • Participants with >=grade 3 toxicity considered related to prior check-point inhibitors and that led to treatment discontinuation.
  • Participants who have received transfusion of blood products within 2 weeks before the first dose of study drug.
  • Participants must not receive live attenuated vaccines within 30 days prior to first dose of study treatment or whilst receiving belantamab mafodotin +- partner agent in any sub-study arm of the platform trial and for at least 70 days following last study treatment.
  • Participants with presence of active renal condition (infection, requirement for dialysis or any other condition that could affect participant's safety). Participants with isolated proteinuria resulting from MM.
  • Participants with known human immunodeficiency virus (HIV) infection, unless the participant can meet all criteria: a) established anti-retroviral therapy for at least 4 weeks and HIV viral load<400 copies/milliliter (mL) b) cluster of differentiation 4 plus (CD4+) T-cell (CD4+) counts >= 350 cells/microliter (µL) c) No history of Acquired immunodeficiency syndrome (AIDS)-defining opportunistic infections within the last 12 months in which case the participant would be eligible for CE Phase only.

For participants receiving nirogacestat, HIV drugs that are strong Cytochrome P450 3A4 (CYP3A4) inhibitors are prohibited. HIV drugs that are moderate CYP3A4 inhibitors, while permitted, should be co-administered with caution and must be accompanied by nirogacestat dose modifications.

  • Participants with autoimmune disease (current or history) or syndrome that required systemic treatment within the past 2 years.
  • Recent (within the past 6 months) history of symptomatic pericarditis.

Treatment and study plan

Belantamab mafodotin

Drug

Belantamab mafodotin will be administered.

Other names: GSK2857916

feladilimab

Drug

Feladilimab will be administered.

Other names: GSK3359609

Primary outcomes

  1. Dose Expansion (DE) Phase: Number of Participants With Dose Limiting Toxicities (DLTs)

    Time frame: Up to 28 days

    Criteria for dose-limiting toxicity (DLT) included hematologic indicators such as Grade 3-5 febrile neutropenia and thrombocytopenia with bleeding. Non-hematologic criteria, excluding corneal toxicity, comprise Grade 3-5 toxicities, with exceptions for manageable nausea, vomiting, or diarrhea, controlled Grade 3 hypertension, and events linked to disease progression. Tumor lysis syndrome (TLS) of Grade 3 or 4, successfully managed within 7 days without end-organ damage, is considered. Corneal toxicity, assessed by the GSK corneal grading scale at Grade 4, is a DLT. Other organ-specific toxicities, notably liver toxicity meeting GSK stopping criteria, also qualify as DLT severity was graded using National Cancer Institute (NCI) - Common Terminology Criteria for Adverse Events (CTCAE) version (v) 5.0.

  2. DE Phase: Number of Participants With Adverse Events (AEs)

    Time frame: Up to approximately 281 weeks

    An AE is any untoward medical occurrence in a clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. AEs were coded using the Medical Dictionary for Regulatory Activities (MedDRA) coding system.

  3. DE Phase: Number of Participants With Worst-Case Hematology Results by Maximum Grade Increase Post - Baseline Relative to Baseline

    Time frame: Baseline (Day 1) and up to approximately 281 weeks.

    Blood samples were collected for evaluation of hematology parameters including Anemia, Hemoglobin increased (HbI), Lymphocyte count decreased (LyD), Lymphocytes count increased (LyI), Neutrophils count decreased (NeuD), Platelet count decreased (PD), Leukocytosis (LC) and White blood cell decreased (WBCD). The laboratory parameters were graded according to CTCAE v5.0. Grade 1 (G1): mild; Grade 2 (G2): moderate; Grade 3 (G3): severe; Grade 4 (G4) life-threatening or disabling. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade. Any worst-case post baseline increases to G1, G2, G3, and G4 are presented. Baseline value was defined as the most recent, non-missing value from a local laboratory prior to the first dose of study treatment.

  4. DE Phase: Number of Participants With Worst-Case Chemistry Results by Maximum Grade Increase Post - Baseline Relative to Baseline

    Time frame: Baseline (Day 1) and up to approximately 281 weeks.

    Blood samples were collected for the analysis of following chemistry parameters: Hypoglycemia (HypoG), hypoalbuminemia (HypoA), creatine kinase increased (CPKI), hyperkalemia, blood lactate dehydrogenase increased (LDHI), hypermagnesemia (HyperM), hypomagnesemia (HypoM), hypernatremia (HyperN), hypercalcemia (HyperC), hypocalcemia (HypoC) and chronic kidney disease (CKD). ). The laboratory parameters were graded according to CTCAE v 5.0. G1: mild; G2: moderate; G3: severe; G4: life-threatening or disabling. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade. Any worst-case post baseline increase to G1, G2 and G3 are presented. The laboratory parameters were graded according to CTCAE v 5.0.

  5. Cohort Expansion (CE) Phase: Overall Response Rate (ORR)

    Time frame: Up to approximately 281 weeks.

    Overall Response Rate (ORR) was defined as the percentage of participants with a confirmed Partial Response (PR) or better as the best overall response (i.e., PR, Very Good Partial Response [VGPR], Complete Response [CR], and stringent Complete Response [sCR]), as assessed by the investigator per international myeloma working group (IMWG) (2016). PR is defined as ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to <200 mg/24 h. VGPR is defined as serum and urine M-component detectable by immunofixation but not on electrophoresis OR ≥ 90% reduction in serum M-component plus urine M-component <100 mg/24 h. CR is defined as negative immunofixation of serum and urine AND disappearance of any soft tissue plasmacytomas AND <5% plasmacytomas in the bone marrow. sCR is defined as CR as above PLUS normal serum free light-chain (FLC) assay ratio and absence of clonal cells in bone marrow by immunohistochemistry or immunofluorescence.

Secondary outcomes

  1. DE Phase: Overall Response Rate (ORR)

    Time frame: Up to approximately 281 weeks.

    Overall Response Rate (ORR) was defined as the percentage of participants with a confirmed Partial Response (PR) or better as the best overall response (i.e., PR, Very Good Partial Response [VGPR], Complete Response [CR], and stringent Complete Response [sCR]), as assessed by the investigator per international myeloma working group (IMWG) (2016). PR is defined as ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to <200 mg/24 h. VGPR is defined as serum and urine M-component detectable by immunofixation but not on electrophoresis OR ≥ 90% reduction in serum M-component plus urine M-component <100 mg/24 h. CR is defined as negative immunofixation of serum and urine AND disappearance of any soft tissue plasmacytomas AND <5% plasmacytomas in the bone marrow. sCR is defined as CR as above PLUS normal serum free light-chain (FLC) assay ratio and absence of clonal cells in bone marrow by immunohistochemistry or immunofluorescence.

  2. CE Phase: Clinical Benefit Rate (CBR)

    Time frame: Up to approximately 281 weeks.

    Clinical benefit rate is defined as the percentage of participants with a confirmed minimal response (MR) or better according to the IMWG Response Criteria. MR is >= 25% but < 49% reduction of serum M-protein and reduction in 24-hour urinary M-protein by 50-89%.

  3. DE Phase: Percentage of Participants Achieving Stringent Complete Response (SCR), Complete Response (CR), Very Good Partial Response (VGPR) and Partial Response (PR)

    Time frame: Up to approximately 281 weeks.

    Partial Response [PR], Very Good Partial Response [VGPR], Complete Response [CR], and stringent Complete Response [sCR] were assessed by the investigator per IMWG (2016). PR defined as ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to <200 mg/24 h. VGPR defined as serum and urine M-component detectable by immunofixation but not on electrophoresis OR ≥ 90% reduction in serum M-component plus urine M-component <100 mg/24 h. CR defined as negative immunofixation of serum and urine AND disappearance of any soft tissue plasmacytomas AND <5% plasmacytomas in the bone marrow. sCR defined as CR as above PLUS normal serum free light-chain (FLC) assay ratio and absence of clonal cells in bone marrow by immunohistochemistry or immunofluorescence.

  4. CE Phase: Percentage of Participants Achieving SCR, CR, VGPR and PR

    Time frame: Up to approximately 281 weeks.

    Partial Response [PR], Very Good Partial Response [VGPR], Complete Response [CR], and stringent Complete Response [sCR] were assessed by the investigator per IMWG (2016). PR defined as ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to <200 mg/24 h. VGPR defined as serum and urine M-component detectable by immunofixation but not on electrophoresis OR ≥ 90% reduction in serum M-component plus urine M-component <100 mg/24 h. CR defined as negative immunofixation of serum and urine AND disappearance of any soft tissue plasmacytomas AND <5% plasmacytomas in the bone marrow. sCR defined as CR as above PLUS normal serum free light-chain (FLC) assay ratio and absence of clonal cells in bone marrow by immunohistochemistry or immunofluorescence.

  5. DE Phase: Plasma Concentration of Belantamab Mafodotin Antibody-Drug Conjugate (ADC)

    Time frame: Predose, end of infusion (EOI), 2 and 24 hours postdose on Cycle (C) 1 Day (D) 1; anytime sample at C1 D4 and D8; Predose and EOI on D1 of C2, C4, C6, C9, C12; Predose on C18 D1; and at end of treatment (EoT, up to approximately 281 weeks.)

    Blood samples were collected for PK analysis of belantamab mafodotin Antibody-Drug Conjugate (ADC). Only those participants who were measured and analyzed (i.e., contributed data reported in the table) were included in the Overall Number of Participants Analyzed field. 'Number Analyzed' signifies participants evaluable for the specified timepoints.

  6. CE Phase: Plasma Concentrations of Belantamab Mafodotin Antibody-Drug Conjugate (ADC)

    Time frame: Up to approximately 281 weeks.

    Blood samples were planned to be collected for PK analysis of Belantamab Mafodotin Antibody-Drug Conjugate (ADC).

  7. DE Phase: Plasma Concentration of Belantamab Mafodotin Total Antibody

    Time frame: Predose, EOI, 2 and 24 hours postdose on C1 D1, anytime sample at C1 D4, D8; Predose and EOI on D1 of C2, C4, C6, C9, C12; Predose on C18 D1; and at EoT (up to approximately 281 weeks.)

    Blood samples were collected for PK analysis of Belantamab mafodotin total antibody.

  8. CE Phase: Plasma Concentration of Belantamab Mafodotin Plasma Total Antibody

    Time frame: Up to approximately 281 weeks.

    Blood samples were planned to be collected for PK analysis of Belantamab mafodotin plasma total antibody.

  9. DE Phase: Plasma Concentrations of Belantamab Mafodotin Cys- Monomethyl Auristatin-F (Cys-mcMMAF)

    Time frame: Predose, EOI, 2 and 24 hours postdose on C1 D1, anytime sample at C1 D4, D8; Predose and EOI on D1 of C2, C4, C6, C9, C12; Predose on C18 D1; and at EoT (up to approximately 281 weeks)

    Blood samples were collected for PK analysis of belantamab mafodotin cys- monomethyl auristatin-F (cys-mcMMAF).

  10. CE Phase: Plasma Concentrations of Belantamab Mafodotin Cys- Monomethyl Auristatin-F (Cys-mcMMAF)

    Time frame: Up to approximately 281 weeks.

    Blood samples were planned to be collected for PK analysis of Belantamab Mafodotin Cys- Monomethyl Auristatin-F (Cys-mcMMAF)

  11. DE Phase: Feladilimab Concentration When Administered in Combination With Belantamab Mafodotin

    Time frame: Predose, EOI, 2 and 24 hours postdose on C1 D1, anytime sample at C1 D4, D8; Predose and EOI on D1 of C2, C4, C6, C9, C12; Predose on C18 D1; and at EoT (up to approximately 281 weeks)

    Blood samples were collected for PK analysis of Feladilimab when administered intravenously in combination with belantamab mafodotin.

  12. CE Phase: Feladilimab Concentration When Administered in Combination With Belantamab Mafodotin

    Time frame: Up to approximately 281 weeks.

    Blood samples were planned to be collected for PK analysis Feladilimab when administered intravenously in combination with belantamab mafodotin.

  13. DE Phase: Number of Participants With Post-baseline Positive Anti-drug Antibodies (ADAs) Against Belantamab Mafodotin

    Time frame: Up to approximately 281 weeks

    Serum samples were collected for the analysis of the presence of ADAs using validated immunoassays. All samples were tested in screening assay, and positive samples were further characterized for antibody titers.

  14. CE Phase: Number of Participants With Post-baseline Positive ADAs Against Belantamab Mafodotin

    Time frame: Up to approximately 281 weeks

    Serum samples were to be collected for the analysis of the presence of ADAs using validated immunoassays. All samples were to be further tested in screening assay, and positive samples were further to be characterized for antibody titers.

  15. DE Phase: Titer of ADAs Against Belantamab Mafodotin

    Time frame: Up to approximately 281 weeks

    Serum samples were collected for the analysis of the presence of ADAs using validated immunoassays. All samples were tested in screening assay, and positive samples were further characterized for antibody titers.

  16. CE Phase: Titer of ADAs Against Belantamab Mafodotin

    Time frame: Up to approximately 281 weeks

    Serum samples were to be collected for the analysis of the presence of ADAs using validated immunoassays. All samples were to be further tested in screening assay, and positive samples were further to be characterized for antibody titers.

  17. DE Phase: Number of Participants With Post-baseline Positive ADAs Against Feladilimab

    Time frame: Up to approximately 281 weeks

    Serum samples were collected for the analysis of the presence of ADAs using validated immunoassays. All samples were to be further tested in screening assay, and positive samples were further to be characterized for antibody titers.

  18. CE Phase: Number of Participants With Post-baseline Positive ADAs Against Feladilimab

    Time frame: Up to approximately 281 weeks.

    Serum samples were to be collected for the analysis of the presence of ADAs using validated immunoassays. All samples were tested in screening assay, and positive samples were further characterized for antibody titers.

  19. DE Phase: Titre of ADAs Against Feladilimab

    Time frame: Up to approximately 281 weeks

    Serum samples were collected for the analysis of the presence of ADAs using validated immunoassays. All samples were tested in screening assay, and positive samples were further characterized for antibody titers.

  20. CE Phase: Titer of ADAs Against Feladilimab

    Time frame: Up to approximately 281 weeks.

    Serum samples were to be collected for the analysis of the presence of ADAs using validated immunoassays. All samples were tested in screening assay, and positive samples were further characterized for antibody titers.

  21. DE Phase: Number of Participants With Adverse Events of Special Interest (AESI)

    Time frame: Up to approximately 281 weeks.

    An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. Adverse Events of Special Interest (whether serious or non serious) were collected.

  22. CE Phase: Number of Participants With AESI

    Time frame: Up to approximately 281 weeks.

    An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. Adverse Events of Special Interest (whether serious or non serious) were planned to be collected.

  23. DE Phase: Number of Participants With Any Corneal Events by Maximum Grade as Per CTCAE Grade

    Time frame: Up to approximately 281 weeks.

    The corneal events were graded according to CTCAE version 5. Grade 1: mild; Grade 2: moderate; Grade 3: severe or medically significant. Grade 4: Life-threatening consequences; Grade 5: Death related to AE. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade. Results are presented for number of participants with any corneal events by maximum grade as per CTCAE grade version (v) 5.0.

  24. CE Phase: Number of Participants With Any Corneal Events by Maximum Grade as Per CTCAE Grade

    Time frame: Up to approximately 281 weeks.

    The corneal events were graded according to CTCAE version 5. Grade 1: mild; Grade 2: moderate; Grade 3: severe or medically significant. Grade 4: Life-threatening consequences; Grade 5: Death related to AE. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade. Results are presented for number of participants with any corneal events by maximum grade as per CTCAE grade version (v) 5.0.

  25. CE Phase: Progression-free Survival (PFS)

    Time frame: Up to approximately 281 weeks.

    PFS is defined as the time from randomization until the earliest date of confirmed progressive disease (PD) per IMWG, or death due to any cause.

  26. CE Phase: Duration of Response (DoR)

    Time frame: Up to approximately 281 weeks.

    DoR is defined as the time from first documented evidence or PR or better until progressive disease per IMWG or death due to progressive disease among participants who achieve confirmed partial response or better.

  27. CE Phase: Time to Response (TTR)

    Time frame: Up to approximately 281 weeks.

    TTR is defined as the time between the date of randomization and the first documented evidence of response (PR or better), among participants who achieve a response (confirmed PR or better).

  28. CE Phase: Overall Survival (OS)

    Time frame: Up to approximately 281 weeks.

    OS is defined as the time from randomization until death due to any cause.

  29. CE Phase: Number of Participants With AEs and SAEs

    Time frame: Up to approximately 281 weeks.

    An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. SAE is defined as any untoward medical occurrence that; results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations judged by physician, is associated with liver injury and impaired liver function. AEs and SAEs were planned to be coded using the Medical Dictionary for Regulatory Activities (MedDRA) coding system.

  30. CE Phase: Number of Participants With AEs Leading to Discontinuation

    Time frame: Up to approximately 281 weeks.

    An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. Number of participants with AEs leading to discontinuation were to be evaluated.

  31. CE Phase: Number of Participants With AEs Leading to Dose Reduction or Delay

    Time frame: Up to approximately 281 weeks.

    Number of participants with dose reduction or delay were to be evaluated.

  32. CE Phase: Number of Participants With Clinically Significant Changes in Hematology Lab Parameters

    Time frame: Baseline (Day 1) and up to approximately 281 weeks.

    Blood samples were to be collected for the analysis of hematology parameters. The laboratory parameters were to be graded according to CTCAE version 5.0. Grade 1 (G1): mild; Grade 2 (G2): moderate; Grade 3 (G3: severe or medically significant; Grade 4 (G4): Life-threatening consequences; Grade 5 (G5): Death related to AE. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade.

  33. CE Phase: Number of Participants With Clinically Significant Changes in Clinical Chemistry Lab Parameters

    Time frame: Baseline (Day 1) and up to approximately 281 weeks.

    Blood samples were to be collected for the analysis of chemistry parameters. The laboratory parameters were to be graded according to CTCAE version 5.0. G1: mild; G2: moderate; G3: severe or medically significant; Grade 4: Life-threatening consequences; Grade 5: Death related to AE. Higher grade indicates greater severity and an increase in CTCAE grade was defined relative to the Baseline grade.

Sponsors and collaborators

Lead sponsor

GlaxoSmithKline

Industry

Registry information

Official study title

A Phase I/II, Randomized, Open-label Platform Study Utilizing a Master Protocol to Study Belantamab Mafodotin (GSK2857916) as Monotherapy and in Combination With Anti-Cancer Treatments in Participants With Relapsed/Refractory Multiple Myeloma (RRMM)-DREAMM5 - Sub-study 2 - Belantamab Mafodotin and Feladilimab (GSK3359609) in Combination

Important dates

Study start
2019
Primary completion
2025
Study completion
2027
First posted
Oct 15, 2025
Registry last updated
Jun 25, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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