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A Polyepitope DNA Vaccine Targeted to Her-2/ErbB-2 Elicits a Broad Range of Human and Murine CTL Effectors to Protect against Tumor Challenge

¹ Institut National de la Santé et de la Recherche Médicale U753, Institut Gustave Roussy, Villejuif, France; ² Dipartimento di Medicina Sperimentale, Università di Roma "La Sapienza"; ³ Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Università di Tor Vergata; ⁴ Centro Ricerca Sperimentale, Istituto Tumori Regina Elena, Rome, Italy; ⁵ Divisione di Oncologia Medica, Facoltà di Medicina, Università di Siena, Siena, Italy; ⁶ Academic Division of Oncology, University of Nottingham, City Hospital, Nottingham, United Kingdom; and ⁷ Immunité Cellulaire Antivirale, Institut Pasteur, Paris, France

Requests for reprints: Antonio Scardino, Università di Roma "La Sapienza," Rome, Italy. Phone: 39-06-537-4342; Fax: 39-06-499-03615; E-mail: antoscardo{at}yahoo.it.

A cDNA vaccine (pVax1/pet-neu) was designed to encode 12 different Her-2/ErbB-2–derived, HLA-A*0201–restricted dominant and high-affinity heteroclitic cryptic epitopes. Vaccination with pVax1/pet-neu triggered multiple and ErbB-2–specific CTL responses in HLA-A*0201 transgenic HHD mice and in HLA-A*0201 healthy donors in vitro. Human and murine CTL specific for each one of the 12 ErbB-2 peptides recognized in vitro both human and murine tumor cells overexpressing endogenous ErbB-2. Furthermore, vaccination of HHD mice with pVax1/pet-neu significantly delayed the in vivo growth of challenged ErbB-2–expressing tumor (EL4/HHD/neu murine thymoma) more actively when compared with vaccination with the empty vector (pVax1) or vehicle alone. These data indicate that the pVax1/pet-neu cDNA vaccine coding for a poly-ErbB-2 epitope is able to generate simultaneous ErbB-2–specific antitumor responses against dominant and cryptic multiple epitopes. [Cancer Res 2007;67(14):7028–36]

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				Correction: Polyepitope DNA Vaccine and Tumor Challenge Cancer Res., August 15, 2007; 67(16): 7937 - 7937. [Full Text] [PDF]