KarMMa-9: A Study to Compare the Efficacy and Safety of Idecabtagene Vicleucel With Lenalidomide Maintenance Therapy Versus Lenalidomide Maintenance Therapy Alone in Adult Participants With Newly Diagnosed Multiple Myeloma Who Have Suboptimal Response After Autologous Stem Cell Transplantation

CR as assessed by IRC

Progression as assessed by IRC

Time-to-definitive deterioration based on the European Organization for Research and Treatment of Cancer core quality of life questionnaire EORTC QLQ-C30 global health status/quality of life subscale

The following subscales on the European Organization for Research and Treatment of Cancer core quality of life questionnaire EORTC QLQ-C30 will be assessed: Global health status/quality of life Physical Functioning Fatigue Pain

The following subscales on the European Organization for Research and Treatment of Cancer core quality of life questionnaire EORTC QLQ-MY20 will be assessed: Disease symptoms Side-effects of treatment