- Men or women treated or enrolled on this protocol must agree to use double barrier contraceptives; oral, implantable, or injectable contraceptives are not considered effective for this study; women of child-bearing potential must have a negative serum pregnancy test =< 72 hours prior to initiating treatment; subjects must agree to use double barrier contraceptive therapy for the duration of study participation, and 4 months after completion of ONC201 administration; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately