Inclusion Criteria:

- Patient was previously diagnosed with multiple myeloma based on standard diagnostic
criteria.

- Patients must have relapsed (progressed > 60 days) after their last dose of
bortezomib-based therapy. In addition, patients may be relapsed or refractory to
other non-bortezomib-based therapies.

- Patient has received at least 1 but not more than 4 prior anti-myeloma regimens and
has progressive disease after the most recent treatment regimen.

- Patients must have adequate organ and marrow function.

Exclusion Criteria:

- Patients must not be refractory to any bortezomib-containing regimen.

- History of allergic reactions or intolerance attributed to compounds of similar
chemical or biologic composition to perifosine (miltefosine or edelfosine),
bortezomib or dexamethasone or any of their components.

- Prior treatment with perifosine or an investigational proteasome inhibitor.

- Chemotherapy or other therapy experimental or proven that is or may be active against
myeloma within two weeks (14 days) prior to Cycle 1 Day 1.