DoR is defined as the time interval between the date of initial documentation of a response (PR or better) to the date of first documented evidence of progressive disease according to the IMWG response criteria or death due to any cause, whichever occurs first.

MRD-negative CR is defined as the percentage of participants with CR or better who achieve MRD-negative status, as determined by next-generation flow cytometry (NGF), at any time point after randomization and prior to PD or subsequent antimyeloma therapy.

MRD-negative CR at 1 year is defined as the percentage of participants who achieve MRD-negative status at 12 months as determined by NGF, prior to PD or subsequent antimyeloma therapy and who also achieve CR or better according to IMWG criteria.

MRD-negative CR at 5 years is defined as the percentage of participants who achieve MRD-negative status at 5 years as determined by NGF, prior to PD or subsequent antimyeloma therapy and who also achieve CR or better according to IMWG criteria.

PFS2 is defined as the time interval between the date of randomization and date of event, which is defined as progressive disease as assessed by investigator on the first subsequent line of antimyeloma therapy, or death from any cause, whichever occurs first. Those who are alive and for whom a second disease progression has not been observed are censored at the last date of follow-up.

OS is defined as the time from the date of randomization to the date of the participant's death due to any cause.

TTNT is defined as the time from randomization to the start of subsequent antimyeloma treatment. Death due to progressive disease without the start of any subsequent antimyeloma therapy will be considered as an event.

An AE is any untoward medical occurrence in a clinical study participant administered a pharmaceutical (investigational or non investigational) product. Any new or worsening AE occurring at or after the initial administration of study treatment through the day of last dose plus 30 days or prior to the start of subsequent anticancer therapy will be considered treatment-related regardless of the start date of the event. TEAEs will be graded according to the National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) Version 6.0. Severity scale ranges from Grade 1= mild, Grade 2= moderate, Grade 3= severe, Grade 4= life-threatening, Grade 5= death related to adverse event.

Number of participants with abnormalities in laboratory parameters (serum chemistry, hematology, and urinalysis) will be reported.

Change from baseline in HRQoL, symptoms and functioning as assessed by MySIm-Q score will be reported. The MySIm-Q is a disease-specific patient-reported outcome (PRO) assessment with established content validity for participants with relapsed or refractory multiple myeloma (RRMM) and newly diagnosed MM.

Change from baseline in symptoms, functioning, and HRQoL as assessed by EORTC-QLQ-C30 score will be reported.

The EQ-5D-5L is a generic measure of health status that contains 5-item questionnaire that assesses 5 domains (mobility, self-care, usual activities, pain or discomfort, and anxiety or depression) plus a visual analog scale rating "health today" with anchors ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). The scores for the 5 dimensions are used to compute a single utility score, ranging from zero (0.0) to 1 (1.0), representing the general health status of the individual.

Time to worsening in HRQoL, symptoms and functioning using the MySIm-Q scale scores will be reported. The MySIm-Q is a disease-specific patient-reported outcome (PRO) assessment with established content validity for participants with RRMM and newly diagnosed MM.

Time to worsening in HRQoL, symptoms and functioning using the EORTC-QLQ-C30 score will be reported.

The EQ-5D-5L is a generic measure of health status that contains 5-item questionnaire that assesses 5 domains (mobility, self-care, usual activities, pain or discomfort, and anxiety or depression) plus a visual analog scale rating "health today" with anchors ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). The scores for the 5 dimensions are used to compute a single utility score, ranging from zero (0.0) to 1 (1.0), representing the general health status of the individual.

The MySIm-Q is a disease-specific PRO assessment with established content validity for participants with RRMM and newly diagnosed MM.

Percentage of participants with meaningful improvement in symptoms, functioning, and HRQoL as assessed by EORTC-QLQ-C30 score will be reported.

The EQ-5D-5L is a generic measure of health status that contains 5-item questionnaire that assesses 5 domains (mobility, self-care, usual activities, pain or discomfort, and anxiety or depression) plus a visual analog scale rating "health today" with anchors ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). The scores for the 5 dimensions are used to compute a single utility score, ranging from zero (0.0) to 1 (1.0), representing the general health status of the individual.

The EORTC IL46 consists of one single question that measures global impression of burden due to treatment-related symptoms. The response options range from "not at all" to "very much" on a 4-point scale.