- Pregnant women are excluded from this study because entinostat and 5-azacitidine are agents with the potential for teratogenic or abortifacient effects; because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with entinostat or 5-azacitidine, breastfeeding should be discontinued if the mother is treated on this protocol; these potential risks may also apply to other agents used in this study