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Significance of Oncotype DX 21-Gene Test and Expression of Long Non-Coding RNA MALAT1 in Early and Estrogen Receptor-Positive Breast Cancer Patients

Authors Huang Z, Qin Q, Xia L, Lian B, Tan Q, Yu Y, Mo Q

Received 12 August 2020

Accepted for publication 4 November 2020

Published 22 January 2021 Volume 2021:13 Pages 587—593


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Seema Singh

Zhen Huang,* Qinghong Qin,* Longjie Xia,* Bin Lian, Qixing Tan, Yinghua Yu, Qinguo Mo

Department of Breast Surgery, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Qinguo Mo
Department of Breast Surgery, The Affiliated Tumor Hospital of Guangxi Medical University, No. 71 Hedi Road, Nanning 530021 Guangxi Province, People’s Republic of China
Tel +86-771-530859

Objective: To investigate the association between the recurrence score (RS) obtained by Oncotype DX 21-gene test and long non-coding RNA (lncRNA) MALAT1 expression in early and estrogen receptor-positive (ER+) breast cancer.
Materials and Methods: The Oncotype DX 21-gene test and MALAT1 expression detection were performed in tumor samples from 76 ER+ and early breast cancer patients with the Surplex liquid chip. The RS value was calculated based on the expression of total 21 genes. The level of MALAT1 was measured in both tumor tissue and para-tumor tissue, and relatively quantified with an internal control gene. Mann–Whitney U-test or Kruskal–Wallis test were used to analyze the association between MALAT1 level and different clinical pathological characteristics, including age, tumor stage, disease grade, lymph node status, Ki-67 expression, and progesterone receptor (PR) status. The association between the RS and different characteristics was analyzed by Wilcoxon rank-sum test. Correlation between two parameters was analyzed by Spearman’s rank correlation analysis.
Results: The expression of MALAT1 was more abundant in tumor tissue (2.992 ± 2.256) than that in adjacent normal tissue (1.641± 1.438, Z=− 2.594, p= 0.009), and it was not correlated with any clinical pathological characteristics. According to the old criteria for RS stratification, 52.7% of patients were in low risk (RS< 18), 36.8% of patients were in medium risk (18≤RS≤ 30), and 10.5% of patients were in high risk (RS> 30). While under the new criteria, 18.4% were in low risk group (RS< 11), 63.2% were in a medium risk group (11≤RS≤ 26), and 18.4% were in a high risk group (RS> 26). The Oncotype DX 21-gene results only correlated with Ki-67 expression under both new and old criteria, and it was not related with other cancer characteristics. The expression of lncRNA MALAT1 was significantly correlated with the Oncotype DX 21-gene results under the old criteria.
Conclusion: MALAT1 is a novel breast cancer biomarker independent of tumor stage, disease grade and lymph node status. MALAT1 level is associated with the Oncotype DX 21-gene RS value. Therefore, combination of MALAT1 and the Oncotype DX 21-gene test may be used to predict prognosis in ER+ and early stage breast cancer.

Keywords: Oncotype DX 21-gene test, MALAT1, long non-coding RNA; lncRNA, breast cancer, risk of recurrence

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