Replicative oncolytic vaccinia virus derived from the Copenhagen strain, genetically modified by inactivation of its thymidine kinase (TK) and ribonucleotide reductase (RR) genes and by addition of genes encoding for the human granulocyte-macrophage colony-stimulating factor (hGM-CSF) cytokine and for a monoclonal antibody targeting the Cytotoxic T-Lymphocyte-Antigen 4 (CTLA-4).
The study involves two GMOs. ChAdOx1-HPV is a recombinant replication-incompetent chimpanzee-derived adenovirus (ChAdY25) viral vector. MVA-HPV is a modified vaccinia virus Ankara vector (MVA). Both vectors encode a fusion of sequences derived from HPV.
Engineered replicative oncolytic vaccinia virus (VV) derived from the Copenhagen strain. It contains three genetic modifications: 1) deletion of the viral thymidine kinase (TK) gene, 2) deletion of the viral ribonucleotide reductase (RR) gene and 3) insertion of the chimeric yeast FCU1 suicide gene in the TK locus.