A Study of Ixazomib, Given With Dexamethasone in Adults With Multiple Myeloma

OS was defined as the time from randomization to death from any cause, up to 3 years are reported.

Overall Response Rate (ORR) was defined as the percentage of participants who achieved partial response (PR), very good partial response (VGPR), or complete response (CR) based on laboratory results and IRC assessment using modified IMWG criteria. PR: >=50% reduction of serum M protein + reduction in 24-hour urinary M protein by >=90% or to <200 mg/24-hour; if M protein is not measurable, >=50% decrease in difference between involved and uninvolved FLC levels is required; if not measurable by FLC, >=50% reduction in bone marrow plasma cells, when baseline value >=30% and; if present at baseline, >=50% reduction in size of soft tissue plasmacytomas is required. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis or >=90% reduction in serum M-protein + urine M-protein level <100 mg/24-hour. CR: negative immunofixation on serum + urine; disappearance of soft tissue plasmacytomas; <5 % plasma cells in bone marrow.

DOR: Time from first documentation of CR/PR/VGPR to first documentation of PD. Per IMWG criteria, PR:>=50% reduction of serum M protein+reduction in 24-hour urinary M protein by >=90% to <200 mg/24-hour or >=50% decrease in difference between involved and uninvolved FLC levels/ >=50% reduction in bone marrow plasma cells, if >=30% at Baseline/ >=50% reduction in size of soft tissue plasmacytomas. VGPR: serum+urine M-protein detectable by immunofixation but not on electrophoresis/ >=90% reduction in serum M-protein + urine M-protein level <100 mg/24-hour. CR:negative immunofixation on serum + urine+disappearance of soft tissue plasmacytomas+<5% plasma cells in bone marrow. 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 to response was defined as the time from randomization to the first documentation of PR/VGPR/CR. Per IMWG criteria, PR: >=50% reduction of serum M protein + reduction in 24-hour urinary M protein by >=90% or to <200 mg/24-hour; if M-protein is not measurable, >=50% decrease in difference between involved and uninvolved FLC levels is required; if not measurable by FLC, >=50% reduction in bone marrow plasma cells, when Baseline value >=30% and; if present at Baseline, >=50% reduction in size of soft tissue plasmacytomas is required. VGPR: serum and urine M-protein detectable by immunofixation but not on electrophoresis or >=90% reduction in serum M-protein + urine M-protein level <100 mg/24-hour. CR: negative immunofixation on serum + urine; disappearance of soft tissue plasmacytomas; <5% plasma cells in bone marrow.

TTP was defined as the time from the date of randomization to first documentation of PD. Per IMWG criteria, PD required 1 of the following: Increase of >=25% from nadir in: Serum M-component (increase must be >=0.5 g/dl; Urine M-component (increase must be >=200 mg/24-hour); In participants without measurable serum and urine M-protein levels difference between involved and uninvolved FLC levels increase of >10 mg/dl; In participants without measurable serum and urine M protein levels and without measurable disease by FLC level: Bone marrow plasma cell percentage must be >=10%; Development of new or increase in size of existing bone lesions or soft tissue plasmacytomas; Development of hypercalcemia (>11.5 mg/dL corrected serum calcium) attributed solely to plasma cell proliferative disease.

The EORTC QLQ-C30 contains 30 items across 5 functional scales (physical, role, cognitive, emotional, and social), 9 symptom scales (fatigue, nausea and vomiting, pain, dyspnea, sleep disturbance, appetite loss, constipation, diarrhea, and financial difficulties) and a global health status/quality of life (QOL) scale. The physical domain consisted of 5 items covering participant's daily physical activities on a scale from 1 (not at all) to 4 (very much). Raw scores were linearly transformed to a total score between 0-100, with a high score indicating better physical functioning.

The EORTC QLQ-C30 contains 30 items across 5 functional scales (physical, role, cognitive, emotional, and social), 9 symptom scales (fatigue, nausea and vomiting, pain, dyspnea, sleep disturbance, appetite loss, constipation, diarrhea, and financial difficulties) and a QOL scale. Most of the 30 items had 4 response levels (not at all, a little, quite a bit, and very much), with 2 questions relying on a 7-point numeric rating scale. Each subscale raw score were linearly transformed to a total score between 0 to 100. For the functional scales and the global health status/QOL scale, higher scores represent better QOL; for the symptom scales, lower scores represent better QOL. The Physical domain of the functional subscale is reported in the secondary outcome measure 7.

The EORTC QLQ-MY20 has 20 items across 4 independent subscales, 2 symptoms scales (disease symptoms, side effects of treatment), and 2 functional subscales (body image, future perspective). Scores were averaged and transformed to 0-100 scale. Higher scores for the future perspective scale indicate better perspective of the future, for the body image scale indicate better body image and for the disease symptoms scale indicate higher level of symptomatology.

EQ-5D-5L comprises of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression), each rated on 5 levels: 1= no problems, 2= slight problems, 3= moderate problems, 4= severe problems, 5= extremely severe problems. Higher scores indicated greater levels of problems across the five dimensions.

The EQ VAS records the respondent's self-rated health on a 20 centimeter (cm), vertical, visual analogue scale ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). The scores from all dimensions were combined into a single index score that was reported, where higher score was better quality of life.

Healthcare resources used during medical encounters included hospitalizations, emergency room stays, or outpatient visits. A hospitalization was defined as at least 1 overnight stay in an Intensive Care Unit and/or non-Intensive Care Unit (acute care unit, palliative care unit, and hospice).

Duration of healthcare resources used during medical encounters including hospitalizations, emergency room stays, or outpatient visits was reported in days. A hospitalization was defined as at least 1 overnight stay in an Intensive Care Unit and/or non-Intensive Care Unit (acute care unit, palliative care unit, and hospice).