- Women of childbearing potential and male patients with partners of childbearing potential must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) prior to study entry, for the duration of study participation, and for 2 months after completion of study; 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; women of childbearing potential enrolling on study must have a negative pregnancy test within 72 hours of enrollment in order to be eligible; breastfeeding should be discontinued while the mother is treated with onalespib and AT7519M