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MicroRNAs (miRNAs) are an abundant class of noncoding RNAs that function to regulate post-transcriptional gene expression, predominantly by translational repression. In addition to their role in prostate cancer initiation and progression, recent evidence suggests that miRNAs might also participate in treatment response across a range of therapies including radiation treatment, chemotherapy and androgen suppression. The mechanism of this regulation is thought to be multifactorial and is currently poorly understood. To date, only a small number of studies have examined the functional role of miRNAs in response to prostate cancer treatment. Elucidating the role of miRNAs in treatment response following radiotherapy, chemotherapy and androgen suppression will provide new avenues of investigation for the development of novel therapies for the treatment of prostate cancer.