The main aims of this 3-part study are as follows: Part 1: To determine any side effects from modakafusp alfa single treatment and how often they occur. The dose of modakafusp alfa will be increased a little at a time until the highest dose that does not cause harmful side effects is found. Part 2: To assess clinical activity of one or more dosing schedules of modakafusp alfa alone in participants with relapsed/refractory multiple myeloma. Dexamethasone standard dose will be administered with one or more selected dose of modakafusp alfa in selected group of participants. Part 3: To find the optimal dose with the more favorable risk-benefit profile of modakafusp alfa. Participants will receive modakafusp alfa at one of two doses which will be given through a vein.
The drug being tested in this study, and which will be given through a vein, is called modakafusp alfa (TAK-573 ) as single agent or in combination with dexamethasone. The study will determine the safety, tolerability, and efficacy of modakafusp alfa as single agent and in combination with dexamethasone in participants with relapsed/refractory multiple myeloma (RRMM). The study consists of 3 Parts: Part 1: Dose Escalation, Part 2: Dose Expansion, Part 3: Dose Extension The study will enroll approximately 65 participants in Part 1, 35 in Part 2, and 236 in Part 3. Participants will be assigned to one of the following treatment groups in Parts 1 and 2 of the study. Participants will be randomly assigned in Part 3 of the study as given below: * Part 1 (Dose Escalation) Schedule A: Modakafusp alfa 0.001 Up to 14 mg/kg * Part 1 (Dose Escalation) Schedule B: Modakafusp alfa TBD * Part 1 (Dose Escalation) Schedule C: Modakafusp alfa TBD * Part 1 (Dose Escalation) Schedule D: Modakafusp alfa TBD * Part 2 (Dose Expansion): Modakafusp alfa TBD + Dexamethasone 40 mg * Part 3 (Dose Extension): Modakafusp alfa 120 mg * Part 3 (Dose Extension): Modakafusp alfa 240 mg The Part 1 (Dose Escalation) portion of the study will follow a 3+3 dose escalation design to evaluate once-weekly up to 4 different schedules of administration of modakafusp alfa starting at 0.001 mg/kg for dose limiting toxicity (DLT) evaluation and to determine the maximum tolerated dose (MTD) or an optimal biological dose (OBD) for assessments in Part 2. The Part 2 (Dose Expansion) will further assess the safety profile of modakafusp alfa and its efficacy at MTD or OBD. For Part 3 (Dose Extension) participants will be randomized 1:1 to receive single-agent modakafusp alfa 120 mg or 240 mg Q4W. Parts 1 and 2 will be conducted at multiple centers in the United States. Part 3 will be conducted worldwide. The maximum treatment duration in this study is up to 12 months (Parts 1 and 2) or until disease progression (Part 3) and overall time to participate in the study is approximately up to 90 months. Participants with clinical benefit may continue treatment after sponsor approval.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
272
Modakafusp alfa intravenous infusion.
Dexamethasone.
Highlands Oncology Group
Springdale, Arkansas, United States
Los Angeles Cancer Network - Glendale Adventist Medical Center
Glendale, California, United States
University of California Irvine
Orange, California, United States
Office of James R. Berenson MD
West Hollywood, California, United States
Smilow Cancer Hospital at Yale New Haven
New Haven, Connecticut, United States
Part 1: Percentage of Participants Reporting One or More Treatment Emergent Adverse Events (TEAEs)
An adverse event (AE) is defined as any untoward medical occurrence in a participants administered a pharmaceutical product; the untoward medical occurrence does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product whether or not it is related to the medicinal product. A TEAE is defined as any AE either reported for the first time or worsening of a pre-existing event after first dose of study drug and within 30 days of the last administration of study drug.
Time frame: Up to 54.3 months in Part 1
Part 1: Number of Participants With Dose-limiting Toxicities (DLTs)
DLTs were evaluated as per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0. Nonhematologic TEAEs of NCI CTCAE Grade ≥3 clearly unrelated to the underlying disease and occurring during the first cycle were considered DLTs.
Time frame: Up to Cycle 1 (cycle length was 28 days for Schedule A, B and D; 21 days for Schedule C)
Part 1: Percentage of Participants Reporting One or More Grade 3 or Higher TEAEs
An AE is defined as any untoward medical occurrence in a participants administered a pharmaceutical product; the untoward medical occurrence does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product whether or not it is related to the medicinal product. TEAEs grades were evaluated as per NCI CTCAE, Version 5.0. Grade 1 scaled as mild; Grade 2 scaled as moderate; Grade 3 scaled as severe or medically significant but not immediately life-threatening; Grade 4 scaled as life-threatening consequences; and Grade 5 scaled as death related to AE. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants Reporting One or More Serious Treatment-emergent Adverse Events (Serious TEAEs)
AE: any untoward medical occurrence in participants administered a pharmaceutical product; untoward medical occurrence does not necessarily have causal relationship with this treatment. AE can therefore be any unfavorable \& unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of medicinal (investigational) product whether or not it is related to medicinal product. TEAE: any AE either reported for first time or worsening of pre-existing event after first dose of study drug \& within 30 days of last administration of study drug. Serious TEAEs: any untoward medical occurrence that: 1)results in death, 2) is life-threatening, 3) requires inpatient hospitalization or prolongation of existing hospitalization, 4) results in persistent or significant disability/incapacity, 5) leads to a congenital anomaly/birth defect in the offspring of the participant or 6) is medically important event. Percentages were rounded off to nearest decimal.
Time frame: Up to approximately 54.3 months in Part 1
Part 1: Percentage of Participants Who Discontinued the Treatment Because of TEAE
An AE is defined as any untoward medical occurrence in a participants administered a pharmaceutical product; the untoward medical occurrence does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product whether or not it is related to the medicinal product. A TEAE is defined as any AE either reported for the first time or worsening of a pre-existing event after first dose of study drug and within 30 days of the last administration of study drug. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants With TEAEs Resulting in Dose Modifications: Dose Delay
Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants With TEAEs Resulting in Dose Modifications: Dose Interruptions
Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants With TEAEs Resulting in Dose Modifications: Dose Reductions
Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants With Clinically Significant Laboratory Values
Laboratory values included hematology, chemistry, and urinalysis and were assessed per investigator's interpretation.
Time frame: Up to 54.3 months in Part 1
Part 1: Percentage of Participants With Clinically Significant Vital Signs Measurements
Vital signs included temperature, pulse, respiratory rate, oxygen saturation, and blood pressure.
Time frame: Up to 54.3 months in Part 1
Part 2: Overall Response Rate (ORR)
ORR was defined as the percentage of participants who achieved a partial response (PR) rate or better (stringent complete response \[sCR\] + complete response \[CR\] + very good partial response \[VGPR\] + PR) during the study as defined by international myeloma working group (IMWG) uniform response criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal free light chain (FLC) ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR:serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours.
Time frame: Up to 34.7 months in Part 2
Part 3: Overall Response Rate (ORR) Assessed by Independent Review Committee (IRC)
ORR was defined as the percentage of participants who achieved a PR rate or better (sCR + CR + VGPR + PR) during the study as defined by IMWG uniform response criteria. PR :≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR:negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. Scr: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR:serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours.
Time frame: Up to 20.5 months in Part 3
Parts 1 and 2: Percentage of Participants With Dose-limiting Toxicities (DLTs)- Like Events
Percentage of participants with TEAEs meeting DLT definition were reported. Toxicity was evaluated as per the NCI CTCAE, Version 5.0. The hematologic TEAEs of Grade ≥3 clearly unrelated to the underlying disease and occur during the first cycle that are considered DLTs: Grade ≥3 hemolysis; Grade 4 neutropenia for \>7 consecutive days; Grade 4 thrombocytopenia for \>14 consecutive days; Grade 3 thrombocytopenia with clinically significant bleeding; Any other Grade ≥4 hematologic toxicity except for Grade 4 lymphopenia. An incomplete recovery from treatment-related toxicity causing \>2-week delay in the next scheduled infusion before the initiation of Cycle 2 were considered a DLT. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2
Part 1: Cmax: Maximum Observed Serum Concentration for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part 1:Schedule A:Day 1&15 in Cycles 1&2; Schedule B: Day1&15 in Cycles 1&2; Schedule C:Day1 in Cycles 1&2; Schedule D: Day 1 in Cycles 1&2: Pre-infusion&at multiple times post-infusion (cycle length was 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: Tmax: Time to Reach the Cmax for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part 1:Schedule A:Day 1&15 in Cycles 1&2; Schedule B: Day1&15 in Cycles 1&2; Schedule C:Day1 in Cycles 1&2; Schedule D: Day 1 in Cycles 1&2: Pre-infusion&at multiple times post-infusion (cycle length was 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: AUC∞: Area Under the Serum Concentration-time Curve From Time 0 to Infinity for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule. Given the low exposure at the 0.1 mg/kg dose, there was insufficient data to characterize the terminal phase PK required for calculating this parameter. Consequently, this parameter has been marked as "Not Calculated" - and therefore not reported - for the Part 1, Schedule A, 0.1 mg/kg dose group, in accordance with non-compartmental PK analysis standards.
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Winship Cancer Institute of Emory University
Atlanta, Georgia, United States
Northwestern Medicine - Northwestern Medical Group
Chicago, Illinois, United States
Loyola University Medical Center
Maywood, Illinois, United States
Investigative Clinical Research of Indiana, LLC
Noblesville, Indiana, United States
June E. Nylen Cancer Center
Sioux City, Iowa, United States
...and 84 more locations
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: AUClast: Area Under the Serum Concentration-time Curve From Time 0 to the Time of the Last Quantifiable Concentration for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: λz: Terminal Disposition Rate Constant for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule. Given the low exposure at the 0.1 mg/kg dose, there was insufficient data to characterize the terminal phase PK required for calculating this parameter. Consequently, this parameter has been marked as "Not Calculated" - and therefore not reported - for the Part 1, Schedule A, 0.1 mg/kg dose group, in accordance with non-compartmental PK analysis standards.
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: T1/2z: Terminal Elimination Phase Half-life for Modakafusp Alfa
As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: CL: Clearance for Modakafusp Alfa
Clearance is defined as a quantitative measure of the rate at which a drug substance is removed from the body. CL = dose/AUC. As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Part 1: Vss: Volume of Distribution at Steady State for Modakafusp Alfa
Volume of distribution is defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired serum concentration of a drug. V(ss) = (dose/AUC)\*MRT, where MRT is mean residence time. As per planned analysis, data for this outcome measure was collected and reported dose-wise for each treatment schedule.
Time frame: Part1:Schedule A:Day 1 in Cycles1&2&Day15 in Cycle1;Schedule B: Day1&15 in Cycle 1;Schedule C:Day1 in Cycles1&2; Schedule D:Day 1 in Cycles1&2: Pre-infusion&at multiple times post-infusion (cycle length= 28 days for Schedule A, B&D;21 days for Schedule C)
Parts 1, 2 and 3: Percentage of Participants With Positive Anti-drug Antibody (ADA) at Any Scheduled and Unscheduled Post-Baseline Visit
ADA samples scoring equal to or above the cut-point (titer of 75) were defined as ADA positive. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2; Up to 20.5 months in Part 3
Part 1: Overall Response Rate (ORR)
ORR was defined as the percentage of participants who achieved a PR rate or better (sCR + CR + VGPR + PR) during the study as defined by IMWG uniform response criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1
Parts 1 and 2: Clinical Benefit Rate (CBR)
The CBR was defined as the percentage of participants with a confirmed response of sCR, CR, VGPR, PR, or minimal response (MR) during the study per investigator assessment as defined by IMWG Uniform Response Criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. MR: ≥25% but ≤49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2
Parts 1 and 2: Disease Control Rate (DCR)
The DCR was defined as the proportion of participants with a confirmed response of sCR, CR, VGPR, PR, MR, or stable disease (SD) during the study per investigator assessment as defined by IMWG Uniform Response Criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. MR: ≥25% but ≤49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. SD: no known evidence of progressive or new bone lesions if radiographic studies were performed. Percentages were rounded off to the nearest decimal.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2
Parts 1, 2, and 3: Duration of Response (DOR)
DOR was defined as the time from the date of first documentation of response PR or better (sCR + CR + VGPR + PR) to the time of disease progression or death, whichever occurs first. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2; Up to 20.5 months in Part 3
Parts 1 and 2: Time to Response
Time to response was defined as the time from first dose to the date of first documentation of response (PR or better \[sCR + CR + VGPR + PR\]) PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2
Parts 1, 2, and 3: Progression Free Survival (PFS)
PFS was defined as the time from the date of enrollment until the date of progressive disease (PD) or death due to any cause, whichever occurs first as defined by IMWG Criteria. Per IMWG criteria, PD: serum M-component increase ≥0.5 g/dl or urine M-component increase ≥ 200 mg/24-hour/ difference between involved and uninvolved FLC levels increase \>10 mg/dl or bone marrow plasma cell ≥10%/ development of new/ increase in size of existing bone lesions or soft tissue plasmacytoma or development of hypercalcemia.
Time frame: Up to 54.3 months in Part 1; Up to 34.7 months in Part 2; Up to 20.5 months in Part 3
Parts 2 and 3: Overall Survival (OS)
The OS was defined as the time from the date of first dose to the date of death due to any cause.
Time frame: Up to 34.7 months in Part 2; Up to 20.5 months in Part 3
Part 2: Cmax: Maximum Observed Serum Concentration for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: AUC∞: Area Under the Serum Concentration-time Curve From Time 0 to Infinity for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: AUClast: Area Under the Serum Concentration-time Curve From Time 0 to the Time of the Last Quantifiable Concentration for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: λz: Terminal Disposition Rate Constant for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: Tmax: Time to Reach the Cmax for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: CL: Clearance for Modakafusp Alfa
Clearance is defined as a quantitative measure of the rate at which a drug substance is removed from the body. CL = dose/AUC.
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: Vss: Volume of Distribution at Steady State for Modakafusp Alfa
Volume of distribution is defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired serum concentration of a drug. V(ss) = (dose/AUC)\*MRT, where MRT is mean residence time.
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 2: T1/2z: Terminal Elimination Phase Half-life for Modakafusp Alfa
Time frame: Schedule C and D: Pre-infusion and at multiple times post-infusion on Day 1 of Cycles 1 and 2: (cycle length was 21 days for Schedule C and 28 days for Schedule D)
Part 3: Objective Response Rate (ORR) by Investigator Assessment
ORR was defined as the percentage of participants who achieved a PR rate or better (sCR + CR + VGPR + PR) during the study as defined by IMWG uniform response criteria. PR :≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR:negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR:serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Clinical Benefit Rate (CBR) by IRC and Investigator Assessment
The CBR was defined as the percentage of participants with a confirmed response of sCR, CR, VGPR, PR, or minimal response (MR) during the study per investigator assessment as defined by IMWG Uniform Response Criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. MR: ≥25% but ≤49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Duration of Clinical Benefit
Duration of clinical benefit was defined as the time from first documented evidence of confirmed MR or better until the earliest date of a confirmed PD per IMWG, or death among participants who achieve a confirmed MR or better. MR: ≥25% but ≤49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. Per IMWG criteria, PD: serum M-component increase ≥0.5 g/dl or urine M-component increase ≥ 200 mg/24-hour/ difference between involved and uninvolved FLC levels increase \>10 mg/dl or bone marrow plasma cell ≥10%/ development of new/ increase in size of existing bone lesions or soft tissue plasmacytoma or development of hypercalcemia.
Time frame: Up to 20.5 months in Part 3
Part 3: Disease Control Rate (DCR) by IRC and Investigator Assessment
The DCR was defined as the proportion of participants with a confirmed response of sCR, CR, VGPR, PR, MR, or stable disease (SD) during the study per investigator assessment as defined by IMWG Uniform Response Criteria. PR: ≥50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by ≥90% or to \<200 mg/24 hours. CR: negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow. sCR: CR+normal FLC ratio and absence of clonal cells in bone marrow biopsy by immunohistochemistry. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis, or ≥90% reduction in serum M-protein plus urine M-protein \<100 mg/24 hours. MR: ≥25% but ≤49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. SD: no known evidence of progressive or new bone lesions if radiographic studies were performed. Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Duration of Disease Control
Duration of disease control was defined as the time from first documented evidence of SD or better until the earliest date of a confirmed PD per IMWG, or death among participants who achieved a SD or better. SD: no known evidence of progressive or new bone lesions if radiographic studies were performed. Per IMWG criteria, PD: serum M-component increase ≥0.5 g/dl or urine M-component increase ≥200 mg/24-hour/ difference between involved and uninvolved FLC levels increase \>10 mg/dl or bone marrow plasma cell ≥10%/ development of new/ increase in size of existing bone lesions or soft tissue plasmacytoma or development of hypercalcemia.
Time frame: Up to 20.5 months in Part 3
Part 3: Time to Progression (TTP) by IRC and Investigator Assessment
TTP was defined as the time from the date of the first dose until the earliest date of confirmed PD per IMWG, or death due to PD. Per IMWG criteria, PD: serum M-component increase ≥0.5 g/dl or urine M-component increase ≥200 mg/24-hour/ difference between involved and uninvolved FLC levels increase \>10 mg/dl or bone marrow plasma cell ≥10%/ development of new/ increase in size of existing bone lesions or soft tissue plasmacytoma or development of hypercalcemia.
Time frame: Up to 20.5 months in Part 3
Part 3: Rate of Minimal Residual Disease (MRD) Negativity Status at a Sensitivity of 10^-5 in Participants Achieving CR
MRD negativity rate at a sensitivity of 10\^-5 was defined as participants who were MRD negative at a sensitivity of 10\^-5 in participants achieving suspected complete response (CR). CR was defined as negative immunofixation of serum and urine, disappearance of any soft tissue plasmacytomas, and \<5% plasma cells in bone marrow; in participants for whom only measurable disease is by serum FLC level, normal FLC ratio of 0.26 to 1.65 in addition to CR criteria was required.
Time frame: Up to 20.5 months in Part 3
Part 3: Duration of MRD Negativity Status at a Sensitivity of 10^-5 in Participants Achieving CR
Duration of MRD negativity (10\^-5) was defined as the time from the first MRD negative status (10\^-5) to the earliest date of the MRD positive status (10\^-5), confirmed PD per IMWG or death.
Time frame: Up to 20.5 months in Part 3
Part 3: Percentage of Participants With Treatment -Emergent Adverse Events (TEAEs)
An AE is defined as any untoward medical occurrence in a participants administered a pharmaceutical product; the untoward medical occurrence does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product whether or not it is related to the medicinal product. A TEAE is defined as any AE either reported for the first time or worsening of a pre-existing event after first dose of study drug and within 30 days of the last administration of study drug. Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Percentage of Participants With Serious Treatment-emergent Adverse Events (Serious TEAEs)
AE: any untoward medical occurrence in participants administered pharmaceutical product; untoward medical occurrence does not necessarily have causal relationship with this treatment. AE can therefore be any unfavorable \& unintended sign (including abnormal laboratory finding), symptom/disease temporally associated with use of medicinal (investigational) product whether or not it is related to medicinal product. TEAE: any AE either reported for first time or worsening of pre-existing event after first dose of study drug \& within 30 days of last administration of study drug. Serious TEAEs: any untoward medical occurrence that: 1) results in death, 2) is life-threatening, 3) requires inpatient hospitalization or prolongation of existing hospitalization, 4) results in persistent or significant disability/incapacity, 5) leads to a congenital anomaly/birth defect in the offspring of the participant or 6) is a medically important event. Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Percentage of Participants With Clinically Significant Laboratory Values
Laboratory values included hematology, chemistry, and urinalysis as interpreted by the investigator.
Time frame: Up to 20.5 months in Part 3
Part 3: Number of Participants at Baseline and at Worst Post-baseline Status as Categorized by Eastern Cooperative Oncology Group (ECOG) Performance Status
ECOG performance status was measured at baseline and over time. ECOG performance status was measured on a 6 point scale: Grade 0: Normal activity, Grade 1: Symptoms but ambulatory, Grade 2: In bed \<50% of the time, Grade 3: In bed \>50% of the time, Grade 4: 100% bedridden, Grade 5: Dead. Reported here is the baseline status and the worst post-baseline status measured. A decrease in grade from baseline indicates an improvement. Only categories for which there was at least 1 participant are reported.
Time frame: Up to 20.5 months in Part 3
Part 3: Health Care Utilization: Length of Hospital Stays
Time frame: Up to 20.5 months in Part 3
Part 3: Percentage of Participants With Neutralizing Antibodies (NAb) at Any Scheduled and Unscheduled Post-Baseline Visit
Percentages were rounded off to the nearest decimal.
Time frame: Up to 20.5 months in Part 3
Part 3: Health Care Utilization: Number of Participants With at Least One Medical Encounter
Medical encounters included hospitalizations, emergency room stays, or outpatient visits.
Time frame: Up to 20.5 months in Part 3
Part 3: Patient-reported Outcome (PRO): Change From Baseline to Cycle 9 in Instrument European Organisation for Research and Treatment of Cancer QLQ Questionnaire Multiple Myeloma Module (EORTC QLQ-MY20)
EORTC QLQ-MY20 is a myeloma-specific module developed by the EORTC group specifically to assess quality of life in participants with multiple myeloma. It contains 20 items which can be grouped into a disease symptom subscale (6 items), side effects of treatment subscale (10 items), body image (1 item) and future perspective subscale (3 items). All transformed scale scores range from 0 to 100 with higher scores indicating worse symptoms (Disease Symptoms and Side Effects of Treatment) or better support/functioning (Future Perspective and Body Image).
Time frame: Baseline, Cycle 9 Day 8 [cycle length was 28 days] (up to 7.7 months)