- Non-secretory Multiple Myeloma Previous anti-tumour therapies, including prior experimental agents or approved anti-tumour small molecules and biologics, within 28 days before the start of protocol treatment. Steroid therapy is permitted (maximum 160 mg dexamethasone or equivalent), but must be stopped 48 hours prior to study drug administration. Bisphosphonates for bone disease and radiotherapy for palliative intent are also permitted.