Circular RNAs (circRNAs) are a new class of covalently closed RNA molecules whose 3'- and 5'-ends are linked by a back-splicing event. Emerging evidence has shown that circRNAs play a vital role in the occurrence and development of many diseases and are promising biomarkers and therapeutic targets. However, knowledge of circRNAs in hematological malignancies is limited. In this review, the biogenesis, categories, characteristics, and functions of circRNAs are summarized, especially the roles of circRNAs in hematopoiesis and hematological malignancies.
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