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miR-101 has been suggested as a tumor suppressor, but the promoter methylation and loss of heterozygosity didn't contribute to its low expression in astrocytoma. We investigated the role of a new long non-coding RNA CASC2c binding with miR-101. High CASC2c was positively correlated with astrocytoma progression, and an unfavorable prognosis factor for patients. Knockdown CASC2c inhibited proliferation and tumorgenesis. Overexpression of CASC2c promotes the malignant characteristic of astrocytoma cells.CASC2c directly bound miR-101 and mediated pre-miR-101 processing into mature miR-101, and functions as a competitor of miR-101 target genes such as  CPEB1 . Patients who possessed both low CASC2c and high miR-101 had a longer survival than those of low CASC2c alone or high miR-101 alone. In summary, CASC2c plays the onco-RNA role in the tumorgenesis of astrocytoma by acting as a decoy miR-101 sponge. Combination of low expression of CASC2c and high expression of miR-101 has an important referential significance to evaluate the prognosis of patients.

CASC2c as an unfavorable prognosis factor interacts with miR-101 to mediate astrocytoma tumorigenesis