- Participant had received chemotherapy, radiotherapy, antibody, immunotherapy, or experimental therapy to treat multiple myeloma since their last dose of bortezomib. Note: participants could have received localized palliative radiotherapy for complications due to osteolytic bone lesions. Participants could have received steroids (dexamethasone or equivalent) or thalidomide or interferon as maintenance therapy since their last dose of bortezomib according to local standard of care. In addition, participants could have received a cumulative dose of up to 160 mg dexamethasone or equivalent as emergency therapy within 4 weeks prior to enrolment. Participants could have received high dose therapy/stem cell transplantation after induction regimen containing bortezomib, but only if PR or CR was observed during bortezomib containing induction therapy