The trial aims to demonstrate the non-inferiority of subcutaneous to intravenous isatuximab administration in transplant-eligible patients with newly diagnosed multiple myeloma.

Prospective, multicentre, randomised, parallel group, open, phase III clinical trial, for patients with confirmed diagnosis of untreated multiple myeloma requiring systemic therapy.

Investigational Medicinal Product: Isatuximab, subcutaneous administration via a wearable injector system.

Randomization: Patients are randomized in one of 2 study arms (A or B) before induction therapy. Patients randomized in arm A will receive 3 cycles of the monoclonal antibody isatuximab intravenously, combined with RVd regimen (Lenalidomide, Bortezomib, Dexamethasone). Each cycle will last for 42 days. Patients in arm B will receive 3 cycles RVd plus isatuximab subcutaneously. After induction therapy, patients will receive standard intensification (usually cyclophosphamide-based mobilization therapy, stem cell collection and high-dose melphalan followed by autologous stem cell transplantation (HDM/ASCT)). End of study will be after the first HDM/ASCT.

There is one primary objective:

Demonstration of non-inferiority of subcutaneous (SC) isatuximab compared to intravenous (IV) isatuximab, both in combination with RVd, with respect to rates of VGPR or better after induction therapy (according to standard International Myeloma Working Group (IMWG) response criteria).

Key secondary objectives are:

1. Comparison of patient-reported outcomes (PRO) regarding route of administration of isatuximab (SC vs. IV) on induction therapy as assessed by modified CTSQ (modified 9-item questionnaire).
2. Non-inferiority of rates of MRD negativity (assessed by NGS from BMA; sensitivity 10^-5) independent of standard IMWG response after induction therapy.

The duration of the trial for each patients is expected to be approximately 10 months (induction and intensification treatment).

Inclusion Criteria:

• Confirmed diagnosis of untreated MM requiring systemic therapy (diagnostic criteria according to IMWG)
• Patient is eligible for high-dose melphalan (200 mg/m^2 melphalan) and autologous stem cell transplantation
• Measurable MM disease according to IMWG criteria, defined as any quantifiable monoclonal protein value, defined by at least one of the following three measurements: serum M-protein ≥ 10 g/L; urine light-chain (M-protein) of ≥ 200 mg/24 hours; involved FLC level ≥ 10 mg/dL provided sFLC ratio is abnormal
• Age 18-70 years at trial inclusion

Exclusion Criteria:

• Patient has known hypersensitivity (or contraindication) to any of the components of study therapy
• Systemic amyloid light-chain amyloidosis (except for localized AL amyloidosis limited to the skin or the bone marrow)
• Plasma cell leukemia
• Previous chemotherapy or radiotherapy during the past 5 years except local radiotherapy in case of local MM progression
• Severe cardiac dysfunction (NYHA classification III-IV)
• Patients with active or uncontrolled hepatitis B or C or detectable liver disease due to hepatitis B or C
• HIV positivity
• Patients with active, uncontrolled infections
• Patients with severe renal insufficiency or requiring hemodialysis
• Patients with peripheral neuropathy or neuropathic pain, grade 2 or higher (as defined by the NCI Common Terminology Criteria for Adverse Events)
• Patients with a history of any active malignancy during the past 5 years with the exception of following malignancies after curative therapy: basal cell carcinoma of the skin, squamous cell skin carcinoma, stage 0 cervical carcinoma or any in situ malignancy
• Platelet count < 75 x 10^9/L
• Haemoglobin ≤ 8.0 g/dL, unless related to MM
• Absolute neutrophil count (ANC) < 1.0 x 10^9/L (the use of colony stimulating factors within 14 days before the test is not allowed)
• Corrected serum calcium > 14 mg/dL (> 3.5 mmol/L)
• Pregnancy and lactation

For further details on inclusion/exclusion criteria please refer to the study protocol.