NCIt definition : A cancer vaccine comprised of a recombinant modified vaccinia Ankara (MVA) viral vector
encoding the wild-type form of the tumor protein p53 (wt p53), with potential immunostimulating
and antineoplastic activities. Upon subcutaneous vaccination with MVA vaccine expressing
p53, the expressed p53 may stimulate the host immune system to mount a p53-specific
cytotoxic T-lymphocyte (CTL) response against tumor cells expressing p53, resulting
in tumor cell lysis. The MVA viral vector, derived from the replication-competent
strain Ankara, is a highly attentuated, replication-defective vaccinia strain and
is incapable of virion assembly. The p53 gene, a tumor suppressor gene, is mutated
in many cancer cell types.;