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Over the last two decades, there have been extensive efforts to develop small-molecule inhibitors of protein–protein interactions (PPIs) as novel therapeutics for cancer, including hematologic malignancies. Despite the numerous challenges associated with developing PPI inhibitors, a significant number of them have advanced to clinical studies in hematologic patients in recent years. The US Food and Drug Administration approval of the very first PPI inhibitor, venetoclax, demonstrated the real clinical value of blocking protein–protein interfaces. In this review, we discuss the most successful examples of PPI inhibitors that have reached clinical studies in patients with hematologic malignancies. We also describe the challenges of blocking PPIs with small molecules, clinical resistance to such compounds, and the lessons learned from the development of successful PPI inhibitors. Overall, this review highlights the remarkable success and substantial promise of blocking PPIs in hematologic malignancies.
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