Dr Andreeff’s group has worked extensively on drug resistance in hematopoietic malignancies and breast cancer and developed or co-developed several new therapeutic agents including the novel triterpenoids CDDO and CDDO-Me and Bcl-2-, XIAP-, surviving-, MEK- and HDM2- inhibitors. Over the last decade, his group has made major contributions to the understanding of micro-environment-mediated drug resistance and developed strategies to exploit the underlying mechanisms for the treatment of hematopoietic and epithelial malignancies. His group reported the role of bone marrow-derived multipotent mesenchymal stromal cells (MSC) in tumor stroma formation and developed therapeutic strategies based on this discovery.