Lenalidomide is a medication used to treat multiple myeloma, smoldering myeloma, and myelodysplastic syndromes (MDS).
It is a more potent molecular analog of thalidomide, which inhibits tumor angiogenesis, tumor-secreted cytokines, and tumor proliferation through induction of apoptosis.
Although not specifically approved by the FDA for use in treating AL amyloidosis, lenalidomide is sometimes used in the treatment of that condition, often in combination with dexamethasone.