Bortezomib Injection is a medicine that targets proteins in cancer cells and stops the cancer cells from growing. It is used to treat multiple myeloma and mantle-cell lymphoma. This medicine may be used for other purposes. This medication is a cancer chemotherapy drug used to treat certain types of tumors (e.g., multiple myeloma ). It blocks certain proteins which help to slow the growth and spread of the cancer. Bortezomib for Injection is indicated for the treatment of adult patients with multiple myeloma. Bortezomib is also being studied in the treatment of other types of cancer. Bortezomib Injection is very effective.