Isa-Rd for Frail and/or Much Older Patients With Newly Diagnosed Multiple Myeloma

This study aims to determine the optimal treatment regimen for older and/or otherwise toxicity-vulnerable patients with newly diagnosed multiple myeloma (NDMM) who cannot receive approved standard therapy. As a result, this Phase II trial of isatuximab, lenalidomide, and dexamethasone (Isa-Rd) selectively enroll much older and/or otherwise highly toxicity-vulnerable participants. Furthermore, the safety and effectiveness of isatuximab when used in combination with lenalidomide and dexamethasone at lower doses will be evaluated. It is expected that using this combination at lower doses, may help patients achieve a better response while causing fewer or less severe side effects.

All participants on the trial will also be evaluated by Cancer and Aging Research Group Geriatric Assessments (CARG-GA) and patient-reported outcome (PRO) measures of quality of life (QOL). "Geriatric assessment" will be referred to as "global assessment" for study purposes, to reflect the fact that younger participants will likely participate in the study. Optional correlative blood samples will be collected to study biomarkers of aging and frailty with a focus on both the relation to isatuximab specifically, as well as treatment response and risk for intolerability.

Duration of Therapy:

The length of study participation will depend on the response to the treatment, and it may last approximately 2 years. Participants will receive isatuximab for two years, and then isatuximab will be discontinued. Dexamethasone administration will occur weekly for the first eight cycles. Lenalidomide will be continued as maintenance until disease progression or unacceptable toxicity.

In the absence of treatment delays due to adverse events, treatment should continue until:

* Disease progression * Inter-current illness that prevents further administration of treatment * Treatment delay of more than 12 weeks. * Unacceptable adverse event(s) * Pregnancy * Subject decides to withdraw from study treatment, or * General or specific changes in the subject's condition render the subject unacceptable for further treatment in the judgment of the investigator. * Subject is lost to follow up

Duration of Follow Up:

All participants (including those withdrawn for AE (Adverse Event) will be followed after removal from study treatment until death or full subject withdrawal from the study for other reasons. Participants removed from study treatment for unacceptable AEs will be followed for resolution or stabilization of the adverse event(s).