AML, acute myloid leukemia; BSJ, back-splice junction; Biomarker; CLL, chronic lymphocytic leukemia; CML, chronic myeloid leukemia; CRC, colorectal cancer; Cancer; Circular RNAs; EIciRNAs, exon­intron RNAs; EMT, epithelial-mesenchymal transition; Functions; GC, gastric cancer; HCC, hepatocellular carcinoma; ISH, in situ hybridization; LUAD, lung adenocarcinoma; MER, miRNA response elements; MM, multiple myeloma; NSCLC, non-small cell lung cancer; PCR, polymerase chain reaction; PDAC, pancreatic ductal adenocarcinoma; RBP, RNA-binding protein; RNA, ribonucleic acid; RNase, ribonuclease; RT-PCR, reverse transcription-PCR; TNM, tumor node metastases; UTR, untranslated regions; ccRCC, clear cell renal cell carcinoma; ceRNAs, endogenous RNAs; ciRNAs, circular intronic RNAs; ciRS-7, circular RNA sponge for miR-7; circRNAs, circular RNAs; ecircRNAs, exonic circular RNAs; lncRNAs, long ncRNA; miRNAs, microRNAs; ncRNAs, noncoding RNAs; qPCR, quantitative PCR; rRNA, ribosomal RNA; siRNAs, small interfering RNAs; snRNA, small nuclear RNA; tricRNAs, tRNA intronic circRNAs