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R loops are involved in the regulation of many important cellular processes, including replication, transcription, centromere stabilization, protection of chromosome ends, or control of telomere length. Unscheduled R loops are linked to many diseases, including cancer, neurodegenerative, or inflammatory disorders. The list of cancer diseases linked to excessive R loop accumulation is growing rapidly. There is currently much debate about the understanding of abnormal R loop formation and its impact on genome instability and cancer development. In this review, we briefly describe the nature of R loops, their formation under physiological and pathological conditions, and the proteins involved in the regulation of R loops. In addition, we emphasize the possible role of the human ribonuclease Dicer, a multi\u2010tasking protein mostly known for its important role in microRNA biogenesis, in the regulation of R loops. 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