An International, Non-Comparative, Open-Label Study of PS-341 Administered to Patients With Multiple Myeloma Who Experienced Relapsed or Progressive Disease After Receiving at Least Four Previous Treatment Regimens or Experienced Progressive Disease After Receiving Dexamethasone in Millennium Protocol M34101-039

The rationale for Amendment 2 is 2-fold. First, it is intended that this study serve as a rollover protocol for patients who experience progressive disease (PD) after receiving the comparator treatment, high-dose dexamethasone, in MPI Study M34101-039, thereby ultimately providing all patients who participate in Study M34101-039 and require treatment for their disease access to VELCADE™ (bortezomib) for Injection, formerly known as MLN341, LDP-341 and PS-341.