12. Willing to use effective birth control measures: Since the effects of P53 vaccine and CT-011 on the developing human fetus are unknown and potentially harmful, women of child-bearing potential and men with partners of childbearing potential must agree to use adequate contraception (hormonal or double barrier method of birth control or complete abstinence) prior to study entry and for the duration of study participation and for one month after the last dose of investigational agent. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.