Lenalidomide, Bortezomib and Dexamethasone Induction Therapy With Either Intravenous or Subcutaneous Isatuximab in Patients With Newly Diagnosed Multiple Myeloma

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.