A Phase 3 Study to Evaluate Efficacy and Safety of Masitinib in Patients With Relapse or Refractory Multiple Myeloma

Inclusion Criteria: 1. Patient with confirmed multiple myeloma requiring systemic therapy. A 2. Patient with multiple myeloma relapsing according to the International uniform response criteria for multiple myeloma (IMWG 2009/ revised Bladé criteria) to one previous line of treatment 3. Patient with measurable progressive disease Exclusion Criteria: 1. Patient with peripheral neuropathy Grade \>2 2. Patient with hypersensitivity to bortezomib, boron or dexamethasone 3. Patient whose disease progressed during or within 60 days of bortezomib treatment or of any other Multiple Myeloma therapy 4. Patient who received bortezomib within 6 months of randomization to this study 5. Past discontinuation of bortezomib due to associated grade 3 or higher adverse event 6. Patient with contra-indication to high dose of steroids (including ongoing active infection, use of live vaccines, virosis such as hepatitis, herpes, varicella, herpes zoster)