Michel Sadelain (born 1960) is an genetic engineer and cell therapist at Memorial Sloan Kettering Cancer Center, New York, New York, where he holds the Steve and Barbara Friedman Chair.[2] He is the founding director of the Center for Cell Engineering and the head of the Gene Transfer and Gene Expression Laboratory. He is a member of the department of medicine at Memorial Hospital and of the immunology program at the Sloan Kettering Institute.[2] He is best known for his major contributions to T cell engineering and chimeric antigen receptor (CAR) therapy, an immunotherapy based on the genetic engineering of a patient's own T cells to treat cancer.[3]
Sadelain was born in 1960 in Paris, France,[4] where he earned his MD at the University of Paris, France, in 1984.[5] After obtaining his PhD in immunology at the University of Alberta in Edmonton, Canada, in 1989, he trained as a postdoctoral fellow at the Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts.[5] While at MIT, Sadelain began his research on genetic engineering.[6] In 1994, Sadelain joined Memorial Sloan Kettering as an assistant member in the Sloan Kettering Institute, where he established programs on human hematopoietic stem cell and T cell engineering.[6] In 2008, he founded the Center for Cell Engineering at Memorial Sloan Kettering.[6] He is a past president of the American Society of Cell and Gene Therapy (2014–2015) and previously served on its board of directors from 2004 to 2007. He served as a member of the Recombinant DNA Advisory Committee (RAC) of the NIH from 2013 to 2015.[5]
Sadelain and his team study gene transfer in hematopoietic stem cells and T cells, the regulation of transgene expression, the biology of chimeric antigen receptors, and therapeutic strategies to enhance immunity against cancer. Sadelain is a recognized leader in the conceptualization and design of synthetic receptors for antigen, which he named chimeric antigen receptors (CARs).[7] T cells can be engineered to express a CAR to acquire the ability to recognize and destroy cancer cells. Sadelain has referred to CAR T cells as a “living drug.”[8] A CAR typically comprises an antibody fragment (scFv) to recognize the cancer and a modular signaling domain to activate the T cell and promote T cell multiplication and persistence. CAR T cells are made by extracting a cancer patient's T cells, inserting a CAR into the cell using a vector such as a gamma-retroviral or lentiviral vector, and then re-infusing the genetically instructed T cells. Sadelain's current research makes use of genome editing, which he showed makes better CAR T cells when the CAR is expressed from the TRAC locus.[9][10][11]
Sadelain's laboratory designed second generation CARs, which are endowed with both activating and costimulatory properties, which is integral to the success of CAR therapies.[12] In 2003, Sadelain's lab identified CD19 as a target for CAR therapy in mice. Following the establishment of clinical CAR T cell manufacturing by Dr. Isabelle Rivière at MSK, Sadelain's team was the first to report on molecular complete responses induced by CD19 CAR T cells in adults with relapsed, refractory acute lymphoblastic leukemia.[13][14][15] The MSK team received FDA breakthrough designation for this treatment in 2014. The US FDA approved the first CAR therapies, targeting CD19 with second generations CARs, in 2017.[16]
Sadelain's research on “off-the-shelf” CAR T cells derived from induced pluripotent stem cells (iPSCs) is now being developed in a collaboration with Fate Therapeutics. His research with Dr. Prasad S. Adusumilli led to a collaboration with Atara Biotherapeutics, Inc. for a product candidate to treat malignant mesothelioma using mesothelin-targeted CAR T cells named icasM28z.[17] In 2013, Sadelain co-founded Juno Therapeutics Inc.[18][19]
Sadelain also designed lentiviral vectors encoding the β-globin gene for the treatment of severe hemoglobinopathies, which include β-thalassemia and sickle cell disease.[20] The MSK team was the first to treat patients with β-thalassemia in the US.[20] The history of the field and Sadelain's contributions are narrated in the 2021 George Stamatoyannopoulos Memorial Lecture at the annual meeting of the American Society of Gene and Cell Therapy.[21][1]
Sadelain holds numerous patents in immunotherapy.[22] Sadelain is a named inventor on U.S. Patent No. 7446190B2 covering nucleic acids encoding chimeric T cell receptors.[23] Sadelain is also named on patent U.S. Patent No. 10,370,452 covering compositions and uses of effector T cells expressing a chimeric antigen receptor (CAR), where such T cells are derived from a pluripotent stem cell including an induced pluripotent stem cell (iPSC).[24] The patent is licensed for off-the-shelf, T-cell receptor (TCR)-less CD19 chimeric antigen receptor (CAR) T-cell product candidate known as FT819.[25][22][26]