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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

steroid hormones --- Androgens --- Estrogens --- Hormone-dependent cancers --- intracrine action --- Transporter proteins --- Organic anion-transporting polypeptides --- organic anion-transporters --- Drug Targets --- Drug Discovery

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MicroRNAs (miRs) are small noncoding RNAs that function as post-transcriptional regulators of gene expression and have important roles in almost all biological pathways. Deregulated miR expression has been detected in numerous cancers, where miRs act as both oncogene and tumor suppressors. Due to their important roles in tumorigenesis, miRs have been investigated as prognostic and diagnostic biomarkers and as useful targets for therapeutic intervention. From a therapeutic point of view, two modalities can serve to rectify gene networks in cancer cells. For oncomiRs, a rational means is downregulation through antagomirs. Moreover, observations of the pathological reductions in tumor-suppressive miRs have inspired the concept of “miR replacement therapy” to enhance the amount of these miRs, thereby restoring them to normal levels. However, the clinical applicability of miR-based therapies is severely limited by the lack of effective delivery systems. Therefore, to understand the role of this new class of regulators, we need to identify the mRNA targets regulated by individual miRs as well as to develop specific, efficient, and safe delivery systems for therapeutic miRs.

Breast cancer --- Hypoxia inducible factor 1-alpha (HIF-1α) --- MicroRNA (miRNA) --- miR526b --- miR655 --- Oxidative stress --- Migration --- Cyclooxygenase-2 (COX-2) --- Prostaglandin E2 receptor 4 (EP4) --- PI3K/Akt --- adipokines --- endometrial cancer --- estrogens --- hyperinsulinemia --- insulin --- insulin resistance --- insulin signaling --- insulin-like growth factors --- microRNA --- miRNA --- ovarian cancer --- survival --- prognostic factor --- serum LDH --- blood biomarker --- circulating microRNA --- plasma --- immunotherapy --- immune checkpoint inhibitors --- metastatic melanoma --- hepatocellular carcinoma --- metastasis --- exosome --- bioinformatics analysis --- renal cancer --- RCC --- ccRCC --- meta-analysis --- miRNAs --- normal B-cell development --- B-CLL --- miRNA-transcription factor network --- regulation --- biomarker --- therapy --- prognosis --- diagnosis --- progression --- prediction --- smoking --- non-small cell lung cancer --- methylation --- miR-584-5p --- YKT6 --- snoRNA --- 2′-O-methylation --- pseudouridylation --- malignant melanoma --- cancer stem cell --- stemness --- head and neck squamous cell carcinoma --- colon cancer --- cancer stem cells --- microRNAs --- deformability --- PARP --- replication stress --- targeted therapy --- breast cancer --- circulating biomarkers --- medulloblastoma --- brain tumour --- subgroups --- stem cells --- n/a --- 2'-O-methylation