HOXB13 expression and promoter methylation as a candidate biomarker in gastric cancer

Sui,Bai‑Qiang; Zhang,Chun‑Dong; Liu,Ji‑Chao; Wang,Lei; Dai,Dong‑Qiu

doi:10.3892/ol.2018.8371

HOXB13 expression and promoter methylation as a candidate biomarker in gastric cancer

Authors:
- Bai‑Qiang Sui
- Chun‑Dong Zhang
- Ji‑Chao Liu
- Lei Wang
- Dong‑Qiu Dai
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Affiliations: Department of Gastrointestinal Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning 110032, P.R. China
Published online on: March 29, 2018 https://doi.org/10.3892/ol.2018.8371
Pages: 8833-8840

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Abstract

Homeobox b13 (HOXB13) is considered to be a tumor suppressor gene in multiple types of human cancer. The present study aimed to identify the difference in expression of HOXB13 mRNA between gastric cancer (GC) tissues and corresponding non‑malignant gastric tissues. The clinical significance of HOXB13 mRNA expression was also assessed in GC and a potential association between HOXB13 mRNA expression and DNA promoter methylation was observed. The expression of HOXB13 mRNA was assessed by reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) and HOXB13 methylation status was assessed by methylation‑specific PCR (MSP) in 5 GC cell lines and 85 paired GC and normal gastric tissues. Kaplan‑Meier survival curves were used to assess the survival of patients with GC. HOXB13 mRNA expression was significantly lower in primary GC tissues than in corresponding nonmalignant gastric tissues, and decreased HOXB13 expression was associated with poorer differentiation, lymph node metastasis, invasion depth and Tumor‑Node‑Metastasis (TNM) stage. Kaplan‑Meier survival analysis demonstrated that HOXB13 mRNA expression was a significant prognostic indicator of GC patient survival. Furthermore, MSP revealed that the proportion of GC samples with hypermethylated HOXB13 (60.0%, 51/85) was increased compared with the corresponding nonmalignant gastric tissues (11.8%, 10/85). Decreased HOXB13 mRNA expression was due to DNA hypermethylation as following treatment with the DNA methyltransferase inhibitor 5‑Aza‑dC, HOXB13 expression in the GC MKN‑45 cell line was upregulated. The results of the present study indicate that decreased expression of HOXB13 mRNA was associated with tumor differentiation, depth of invasion, lymph node metastases and TNM stage in GC, and it was a significant poor prognostic factor for patients with GC. Aberrant DNA promoter methylation was a crucial reason for the downregulation of HOXB13 mRNA expression.

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