A Phase II Study of Once Weekly Carfilzomib, Lenalidomide, Dexamethasone, and Isatuximab in Newly Diagnosed, Transplant-Eligible Multiple Myeloma

All participants will receive 4 cycles of induction therapy. Based on the recommendation of investigators, participants may or may not proceed to an autologous stem cell transplant (SCT) after cycles 1-4. Each cycle is 28 days in length (see dosing details below.) For patient undergoing upfront stem cell transplant (SCT): 4 cycles followed by stem cell collection, high-dose chemotherapy, and autologous SCT followed by 2 cycles (called consolidation). For patients deferring SCT following collection: 4 cycles followed by stem cell collection followed by 4 additional cycles. Carfilzomib: 56 mg/m2 IV on days 1, 8,15 Lenalidomide 25 mg orally (PO) on Days 1-21 Isatuximab: 10 mg/kg IV weekly for cycles 1-2 (days 1, 8, 15, 22), then every 2 weeks for cycles 3-6 (days 1 and 15), and monthly (day 1) thereafter Dexamethasone: 20 mg orally (PO) administered day of and day after carfilzomib and isatuximab (days 1, 2, 8, 9, 15, and 16; days 22 and 23 during cycles 1-2 only).

Only patients that have achieved a partial response (PR) or better after induction therapy with or without stem cell transplant will continue on to maintenance therapy. The treatment participants will receive for maintenance will be based on the biological features (or cytogenetics) of participants myeloma and categorized into two groups: Standard-risk and High Risk. High Risk: subjects with high risk cytogenetics (deletion (del 17, translocation (t)(4:14), t(14;16), t(14;20), 1q duplications) will receive the following study treatment for up to two years (24 28-day cycles) until progressive disease (PD) or unacceptable toxicity: Lenalidomide 10 mg orally (PO) Day 1-21 Carfilzomib 56 mg/m2 or last tolerated dose IV Days 1, 15 Isatuximab 10 mg/kg IV Day 1

Only patients that have achieved a partial response (PR) or better after induction therapy with or without stem cell transplant will continue on to maintenance therapy. The treatment participants will receive for maintenance will be based on the biological features (or cytogenetics) of participants myeloma and categorized into two groups: Standard-risk and High Risk. Standard Risk: subjects without high risk cytogenetics (deletion (del 17, translocation (t)(4:14), t(14;16), t(14;20), 1q duplications) will receive the following study treatment for up to two years (24 28-day cycles) until progressive disease (PD) or unacceptable toxicity: \- Lenalidomide 10 mg orally (PO) Day 1-21

* Induction: protocol determine dose,via IV on 3 days per cycle up to 8 cycles, dependent on Upfront Stem Transplant or Deferring Stem Cell Transplant determination * Maintenance: protocol determine dose,via IV on 2 days per cycle- Maintenance Cycle until progressive disease (PD) or unacceptable toxicity

* Induction: At predetermined dose, via IV up to 8 cycles, dependent on Upfront Stem Transplant or Deferring Stem Cell Transplant determination: \-- Cycles 1 and 2 once per week, Cycles 3-4 every other week, Cycles 5 and 6 every other week, Cycles 7 and 8 once every 4 weeks. * Maintenance: At predetermined dose, via IV, once per cycle, Maintenance Cycle until progressive disease (PD) or unacceptable toxicity

\- Induction Predetermined Dose, oral, days 1-21 of up to 8 cycles, dependent on Upfront Stem Transplant or Deferring Stem Cell Transplant determination Maintenance: At predetermined dose, oral days 1-21 per cycle until progressive disease (PD) or unacceptable toxicity

Induction: Predetermined dosage, oral, Predetermined times per cycle up to 8 cycles dependent on Upfront Stem Transplant or Deferring Stem Cell Transplant determination Maintenance: orally or IV will be administered as a preinfusion medication prior to isatuximab dosing