Preclinical development of a chimeric antigen receptor T cell therapy targeting FGFR4 in rhabdomyosarcoma

Cell Rep Med. 2023 Oct 17;4(10):101212. doi: 10.1016/j.xcrm.2023.101212. Epub 2023 Sep 28.

Abstract

Pediatric patients with relapsed or refractory rhabdomyosarcoma (RMS) have dismal cure rates, and effective therapy is urgently needed. The oncogenic receptor tyrosine kinase fibroblast growth factor receptor 4 (FGFR4) is highly expressed in RMS and lowly expressed in healthy tissues. Here, we describe a second-generation FGFR4-targeting chimeric antigen receptor (CAR), based on an anti-human FGFR4-specific murine monoclonal antibody 3A11, as an adoptive T cell treatment for RMS. The 3A11 CAR T cells induced robust cytokine production and cytotoxicity against RMS cell lines in vitro. In contrast, a panel of healthy human primary cells failed to activate 3A11 CAR T cells, confirming the selectivity of 3A11 CAR T cells against tumors with high FGFR4 expression. Finally, we demonstrate that 3A11 CAR T cells are persistent in vivo and can effectively eliminate RMS tumors in two metastatic and two orthotopic models. Therefore, our study credentials CAR T cell therapy targeting FGFR4 to treat patients with RMS.

Keywords: CAR T cell therapy; FGFR4; rhabdomyosarcoma; specific cytotoxicity.

Publication types

  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Child
  • Humans
  • Immunotherapy, Adoptive
  • Mice
  • Receptor, Fibroblast Growth Factor, Type 4 / genetics
  • Receptor, Fibroblast Growth Factor, Type 4 / metabolism
  • Receptors, Chimeric Antigen* / genetics
  • Rhabdomyosarcoma* / drug therapy

Substances

  • FGFR4 protein, human
  • Receptor, Fibroblast Growth Factor, Type 4
  • Receptors, Chimeric Antigen