'Non-coding RNAs in cancer therapy: Pre-clinical and clinical implications' provides a new insight towards role of non-coding RNAs molecules including microRNAs, long non-coding RNAs and circular RNAs in cancer. The reason of focusing on cancer is that this malignant disease is responsible for high death around the world and after cardiovascular diseases, it is a leading cause of death. In the current book, the basic information and knowledge about ncRNAs, their biogenesis and their biological functions are covered. It is shown that ncRNAs can regulate expression level of genes at transcriptional and post-transcriptional levels and therefore, ncRNAs are master and key players in molecular pathways. Then, the impact of regulation of molecular pathways by ncRNAs on important molecular mechanisms such as proliferation, metastasis, epithelial-to-mesenchymal transition, apoptosis and autophagy are described. All of these aspects are integrated in cancer and for treatment of this disease. In case of miRNAs, their biogenesis and biological functions in physiological conditions are described. Then, impact of miRNAs on proliferation, metastasis, therapy response (drug resistance and radio-resistance) is described. For lncRNAs and circRNAs, a same way is followed and their biogenesis and functional roles in cells are discussed. At the next step, function of lncRNAs and circRNAs in regulating proliferation, metastasis and therapy response (chemoresistance and radio-resistance) is introduced. These subjects are discussed based on pre-clinical studies and in order to make the book more comprehensive and broaden its scope, the function of exosomal ncRNAs in diagnosis and prognosis of cancer patients is described.