In Phase A, individuals will obtain distinctive doses and schedules of oral ABBV-744 tablet to discover safe dosing regimen. More participants is going to be enrolled at the recognized monotherapy dosign program. In Segment B, individuals will obtain oral ruxolitinib and ABBV-744 are going to be offered as "incorporate-on" therapy. https://abbv-744-safety-and-side82457.ja-blog.com/31987376/the-2-minute-rule-for-is-abbv-744-effective-for-hematologic-cancers