bortezomib
(bor-TEH-zoh-mib)
A drug used to treat adults with multiple myeloma or mantle cell lymphoma. It is also being studied in the treatment of other types of cancer. Bortezomib blocks the action of enzymes called proteasomes, which may help keep cancer cells from growing and may kill them. It is a type of proteasome inhibitor. Also called PS-341 and Velcade.