- Maintenance therapy: Patients receive bortezomib IV on days 1, 8, 15, and 22. Patients also receive oral dexamethasone on days 1, 2, 8, 9, 15, 16, 22, and 23. Treatment repeats every 36 days in the absence of disease progression or unacceptable toxicity. Patients who achieve CR receive an additional 2 courses of maintenance therapy beyond documentation of CR.