This clinical trial is a Phase 1, open-label, sequential-group, dose-escalation (Part 1) and cohort-expansion study (Part 2) evaluating the safety, pharmacokinetics, pharmacodynamics, and antitumor activity of CBL0137. The study will evaluate CBL0137 administered IV weekly on Days 1 and 8 of repeated 21 day treatment cycles in subjects with previously treated hematological malignancies.