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Downregulation of lncRNA CASC2 promotes the postoperative local recurrence of early oral squamous cell carcinoma

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Abstract

Purpose

LncRNA CASC2 plays a role as tumor suppressor gene in different types of human malignancies, while its involvement in oral squamous cell carcinoma (OSCC) is unknown. The present study aimed to investigate the involvement of lncRNA CASC2 in OSCC.

Methods

In this study, the expression of lncRNA CASC2 in tumor tissues, adjacent healthy tissues, and plasma of 122 OSCC patients as well as in plasma of 52 healthy controls was detected by RT-qPCR. Diagnostic value of lncRNA CASC2 for OSCC was evaluated by ROC curve analysis. Patients were followed up for 5 years to record recurrence. LncRNA CASC2 expression vectors were transfected into cells of human OSCC cell lines, and the effects on cancer cell proliferation and miRNA-21 expression were analyzed by CCK-8 assay and RT-qPCR, respectively.

Results

We found that CASC2 was significantly downregulated in OSCC patients than in healthy controls. Downregulation of CASC2 distinguished OSCC patients from healthy controls. Local recurrence was observed in 26 out of 122 patients and no distant recurrence was observed during follow-up. Compared with pretreatment levels, plasma levels of CASC2 were significantly increased in patients with local recurrence than in patients without recurrence. Transfection of CASC2 expression vectors led to significantly inhibited tumor cell proliferation and reduced miRNA-21 expression levels.

Conclusions

We, therefore, conclude that downregulation of lncRNA CASC2 may participate in the postoperative local recurrence of early OSCC through miRNA-21.

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Acknowledgements

We thank the financial support from the key subject, Department of Stomatology, Ningbo No. 2 hospital (2016014).

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Authors and Affiliations

  1. Department of stomatology, NingBo No.2 Hospital, No.41 Xibei Street, Haishu district, Ningbo City, 315010, Zhejiang Province, People’s Republic of China

    Yao Dong & Wei Wu

Authors
  1. Yao Dong
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  2. Wei Wu
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Corresponding author

Correspondence to Yao Dong.

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Conflict of interest

Yao Dong has no conflict of interest. Wei Wu has no conflict of interest.

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Dong, Y., Wu, W. Downregulation of lncRNA CASC2 promotes the postoperative local recurrence of early oral squamous cell carcinoma. Eur Arch Otorhinolaryngol 276, 605–610 (2019). https://doi.org/10.1007/s00405-018-5209-8

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  • DOI: https://doi.org/10.1007/s00405-018-5209-8

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