Bortezomib, Cyclophosphamide, and Dexamethasone in Treating Patients With Primary Systemic Light Chain Amyloidosis

RATIONALE: Bortezomib may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Drugs used in chemotherapy, such as cyclophosphamide and dexamethasone, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Giving bortezomib together with combination chemotherapy may kill more cancer cells. PURPOSE: This phase II trial is studying how well giving bortezomib, cyclophosphamide, and dexamethasone together works in treating patients with primary systemic light chain amyloidosis.