A Study to Investigate the Safety, Tolerability, Efficacy, Pharmacokinetics, and Immunogenicity of TAK-079 Administered Subcutaneously as a Single Agent in Participants With Relapsed/Refractory (r/r) Multiple Myeloma (MM)

TEAEs were any untoward medical occurrence (called an adverse event [AE]) that occurred after administration of the first dose of any study drug and through 30 days after the last dose of any study drug.

DLTs were defined as any of the following events: Grade 4 laboratory abnormalities, except those events that were clearly due to extraneous causes; nonhematologic TEAEs of grade greater than or equal to (>=3) except grade 3 nausea/vomiting, fatigue lasting less than 72 hours, elevation of alanine aminotransferase (ALT) or aspartate aminotransferase (AST) that resolves to grade less than or equal to (<=)1 or baseline within 7 days, injection reaction (IR) that responds to symptomatic treatment; Hematologic TEAEs of National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) grade >=4, except grade >=3 hemolysis, grade 3 low platelet or higher count with clinically meaningful bleeding; and an incomplete recovery from treatment-related toxicity causing a greater than (>) 2-week delay in the next scheduled injection before the initiation of Cycle 2 will be considered a DLT.

AE Grades were evaluated as per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 4.03. 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.

TEAEs were any untoward medical occurrence (called an AE) that occurred after administration of the first dose of any study drug and through 30 days after the last dose of any study drug. A SAE is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; or congenital anomaly; or a medically important event.

TEAEs leading to discontinuation were any untoward medical occurrence (called an AE) that occurred after administration of the first dose of any study drug and through 30 days after the last dose of any study drug leading to discontinuation of any of the study treatment when given in combination.

TEAEs were any untoward medical occurrence (called an AE) that occurred after administration of the first dose of any study drug and through 30 days after the last dose of any study drug. Dose modification includes dose delayed, reduced, and drug discontinued permanently. Dose reduced includes scenarios where the dose was skipped, held, or missed. Dose modifications also refer to a modification of any drug in the study treatment when given in combination.

ORR is defined as the percentage of participants who achieved a partial response (PR) better during the study. PR is defined as >=50% reduction of serum M-protein and reduction in 24-hour urinary M-protein by >= 90% or to < 200 milligram per (mg/) 24 hours. If serum and urine M protein are not measurable, >= 50% decrease in difference between involved and uninvolved free light chain (FLC) levels is required in place of M protein criteria.

ORR is defined as the percentage of participants who achieved a partial response (PR) or better during the study. 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 hours. If the serum and urine M-protein were not measurable, a ≥50% decrease in the difference between involved and uninvolved FLC levels was required in place of the M-protein criteria. If serum and urine M-protein were not measurable, and serum FLC was also not measurable, ≥50% reduction in bone marrow plasma cells was required in place of M-protein, provided the baseline percentage was ≥30%. In addition to the above criteria, if present at baseline, ≥50% reduction in the size of soft tissue plasmacytomas was also required. Two consecutive assessments were needed; no known evidence of progressive or new bone lesions if radiographic studies were performed. Percentages are rounded off to whole number at the nearest decimal.

MR is defined as >=25% but <=49% reduction of serum M-protein and reduction in 24-hour urine M-protein by 50% to 89%. Percentages are rounded off to whole number at the nearest decimal.

Percentages are rounded off to whole number at the nearest decimal.

DOR is the time from date of first documentation of response to date of first documented PD. PD is increase of >=25% from lowest response value in any of following:Serum M-protein(increase must be >=0.5 gram per deciliter[g/dL];serum M component increases >=1 g/dL are sufficient to define relapse if starting M component is >=5 g/dL),and/or urine M-protein(increase must be >=200 mg/24 hour), and/or only in participants without measurable serum and urine M-protein levels, difference between involved/uninvolved FLC levels (increase must be >10 mg/dL), and only in participants without measurable serum and urine M-protein levels and without measurable disease by FLC levels, bone marrow plasma cell percentage (percentage must be >=10%) or definite development of new bone lesions or soft tissue plasmacytomas or increase in size of bone lesions or soft tissue plasmacytomas, and development of hypercalcemia that can be attributed solely to plasma cell proliferative disorder.

PFS is time from the date of the first dose until the earliest date of disease progression (PD). PD is increase of >=25% from lowest response value in any of following: Serum M-protein (increase must be >=0.5 g/dL; serum M component increases >=1 g/dL are sufficient to define relapse if starting M component is >=5 g/dL),and/or urine M-protein (increase must be >=200 mg/24 hour), and/or only in participants without measurable serum and urine M-protein levels, difference between involved/uninvolved FLC levels (increase must be >10 mg/dL), and only in participants without measurable serum and urine M-protein levels and without measurable disease by FLC levels, bone marrow plasma cell percentage (percentage must be >=10%) or definite development of new bone lesions or soft tissue plasmacytomas or increase in size of bone lesions or soft tissue plasmacytomas, and development of hypercalcemia that can be attributed solely to plasma cell proliferative disorder.

OS is defined as the time from the date of first dose to the date of death due to any cause.

TTR is defined as the time from the date of the first dose to the date of the first documentation of response (PR [partial response] or better). 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 hours.

RP2D was determined by dose escalating monotherapy groups.