Round RNAs (circRNAs) that have been once regarded as junk are actually in the spotlight being a potential player in regulating individual diseases, cancer especially. downstream MAP2 exons are spliced to upstream exons backwards order in the principal transcript (Chen and Yang, 2015). Furthermore, many exclusive properties make circRNAs a appealing entity in offering essential insights into individual diseases. Besides getting abundant both in regular and cancers cells, it had been also discovered that circRNAs are particularly portrayed at every stage of cell advancement (Li J. et al., 2015). It had been further verified that different isoforms of circRNAs through the same gene are indicated differently in various cell types. In a number of types of malignancies such as for example hepatocellular colorectal and carcinoma tumor, it was mentioned that the manifestation degree of circRNAs varies relating to TNM stage, existence of metastasis and size of tumor (Szabo and Salzman, 2016). Unlike linear RNAs, circRNAs are even more stable and so are not really quickly degraded by ribonucleases such as for example exonuclease or RNase R because of the unexposed 3 and 5 terminals (Wang et al., 2017). Furthermore, most circRNAs possess BIX 02189 pontent inhibitor the average half-life of over 48 h in comparison to linear mRNA with the average half-life of 10 h, rendering it more designed for both study and clinical reasons thus. Furthermore to its beneficial properties, studies possess discovered that circRNAs get excited BIX 02189 pontent inhibitor about several biological actions as contending endogenous RNA BIX 02189 pontent inhibitor by sponging miRNAs (Lin ADF and Chen, 2018), RNA binding proteins (RBPs) (Wang et al., 2015) and translating peptides (Granados-Riveron and Aquino-Jarquin, 2016; Du et al., 2017). Of particular curiosity is the role of circRNAs as miRNA sponge in tumor pathogenesis, and there have been many publications related to this (Wang et al., 2015; Zhang et al., 2017; BIX 02189 pontent inhibitor Kun-Peng et al., 2018). By serving as a miRNA sponge with many binding sites, circRNAs can regulate the expression of miRNA as a competitive inhibitor that suppresses the ability of the miRNA to bind to its target genes. This event can, in turn, increase the levels of the miRNA target causing dysregulation of gene expression and pathological effects on tumor environment (Huang et al., 2015; Palmieri et al., 2018; Zeng et al., 2018). Some of these potential miRNA targets have been reported to function as important regulators of various cellular processes including apoptosis, invasion, migration, and drug resistance in several cancers. Recently, much evidence was published on the role of circRNAs in disease progression and activation of key pathways like EMT and Wnt (Shen et al., 2019; Wu et al., 2019). Cancers that are gaining popularity like gastric, hepatocellular, lung, and breast are being studied closely with the hope to target the specific circRNAs that are involved in the development of tumor (Shang et al., 2019). Accumulating data on the association between circRNA and tumorigenesis shows promising results. However, little is known about its role in cancer therapy resistance. As therapy resistance remains one of the major clinical hurdles in cancer management, this mini-review aims to explore the potential of circRNAs as a regulator of treatment resistance. We reviewed recent relevant publications focusing on circRNAs in treatment resistance, particularly regarding drug therapy and radiotherapy. We also looked at studies at the network level to explain the relationship of circRNAs with the potential targets and pathways that could influence disease progression. CircRNA Effects Radiotherapy Receptivity WNT Pathway Non-coding RNAs have been linked to tumorigenesis, metastasis, as well as the advancement of level of resistance to treatment (Gong et al., 2014). Rays therapy is among the primary treatment solutions for esophageal squamous cell carcinoma (ESCC) individuals, with unresectable esophageal cancer specifically. Unfortunately, radioresistance continues to be among the known reasons for failed remedies and regional tumor recurrence in ESCC (Chen et al., 2017). Inside a scholarly research carried out by Su et al, hsa_circ_001059 and hsa_circ_000167 amounts were been shown to be dysregulated in radioresistant ESCC cell range when compared with the parental cell range (Su et al., 2016). The evaluation demonstrated that circRNA_001059 could sponge to multiple miRNAs including miR-30c-1, miR-30c-2, miR-122, miR-139-3p, miR-339-5p, and miR-1912. To get this locating, miR-30 and miR-122 had been found to become dysregulated in chemoresistant prostate tumor and miR-30 in radiosensitive leukemia cells (Ni et al., 2017; Liamina et al., 2017). These dysregulated circRNAs had been mapped with their focus on genes and had been found to become mainly mixed up in Wnt signaling pathway as well as the.