Lenalidomide is a derivative of thalidomide introduced in 2004. It was initially intended as a treatment for multiple myeloma, for which thalidomide is an accepted therapeutic modality, but has also shown efficacy in the hematological disorders known as the myelodysplastic syndromes. The exact mechanism of the immunomodulatory drugs is not known. Apart from interfering with the immune system, they are also thought to act on angiogenesis. Lenalidomide and bortezomib are...