SCHEDULE I: Patients receive dinaciclib intravenously (IV) over 2 hours and bortezomib subcutaneously (SC) or IV (if patients do not tolerate SC injection) on days 1, 8, and 15 and dexamethasone orally (PO) once daily (QD) on days 1, 2, 8, 9, 15, and 16. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity.