Like our ALK vaccine, this group had worked on a TP53 vaccine, using a similar technique Dr. Chairle described for ALK. TP53 (tumor protein p53) is the most commonly mutated cancer driver gene, but drugs that target mutant tumor suppressor genes, such as TP53, are not yet available. Here, we describe the identification of an antibody highly specific to the most common TP53 mutation (R175H, in which arginine at position 175 is replaced with histidine) in complex with a common human leukocyte antigen–A (HLA-A) allele on the cell surface. We describe the structural basis of this specificity and its conversion into an immunotherapeutic agent: a bispecific single-chain diabody. Despite the extremely low p53 peptide-HLA complex density on the cancer cell surface, the bispecific antibody effectively activated T cells to lyse cancer cells that presented the neoantigen in vitro and in mice. This approach could in theory be used to target cancers containing mutations that are difficult to target..... READ ARTICLE

Science DOI: 10.1126/science.abc8697

Authors: Emily Han-Chung Hsiue, Katharine M. Wright, Jacqueline Douglass, Michael S. Hwang, Brian J. Mog, Alexander H. Pearlman, Suman Paul, Sarah R. DiNapoli, Maximilian F. Konig, Qing Wang, Annika Schaefer, Michelle S. Miller, D. Skora, P. Aitana Azurmend, Michael B. Murphy, Liu, Evangeline Watson, Yana Li, M. Pardoll, Chetan Bettegowda, Nickolas Papadopoulos, Kenneth W. Kinzler, Bert Vogelstein,Sandra B. Gabelli, Shibin Zhou

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