An immumogenic polypeptide for inducing antibodies that neutralize the immunosuppressive and/or angiogenic activity of an E7 protein from Papillomavirus, wherein said immunogenic polypeptide consists of an E7 protein from Papillomavirus that has been inactivated so as to eliminate at least 70% of the immunosuppressive and/or angiogenic activity of the non-inactivated E7 protein. The inactivation is effected by physical and/or chemical treatments and/or by modification of the amino acid sequence of the polypeptide.