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. 2023 Feb 9;30(6):269-276.
doi: 10.32604/or.2022.027277. eCollection 2022.

The Implication of microRNAs as non-invasive biomarkers in 179 Egyptian breast cancer female patients

Nadia Z Shaaban  1 , Nashwa K Ibrahim  2 , Helen N Saada  2 , Fatma H El-Rashidy  1 , Hebatallah M Shaaban  3 , Nermeen M Elbakary  2 , Ahmad S Kodous  1   2
Affiliations

The Implication of microRNAs as non-invasive biomarkers in 179 Egyptian breast cancer female patients

Nadia Z Shaaban et al. Oncol Res. .

Abstract

Background: MicroRNAs (miRs) are small (19-25 nucleotides), non-protein coding RNAs that regulate gene expression, and thus play essential roles in cell cycle progression. The evidence has demonstrated that the expression of several miRs is dysregulated in human cancer.

Methods: The study includes 179 female patients and 58 healthy women Patients were identified as luminal A, B, Her-2/neu, and basal-like, as well as classified into I, II, and III stages. Analysis of the expression fold change of miR-21 and miR-34a with molecular markers, including the oncogene Bcl-2 (B-cell lymphoma 2) and the tumor suppressor genes BRCA1 (breast cancer susceptibility gene 1), BRCA2 (breast cancer susceptibility gene 2), and the tumor suppressor protein p53, was carried out for all patients, pre- and post-chemotherapy, and for all healthy women.

Results: At diagnosis (pre-chemotherapy), miR-21 was up-regulated (p < 0.001), while miR-34a was down-regulated (p < 0.001). Post-chemotherapy, the expression of miR-21 decreased significantly (p < 0.001), while the expression of miR-34a increased significantly (p < 0.001).

Conclusion: miR-21 and miR-34a may be helpful to non-invasive biomarkers to evaluate the response of breast cancer to chemotherapy.

Keywords: BRCA1 and BRCA2; Bcl-2; Breast-cancer; miR-21 and miR-34a; p53.

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Conflict of interest statement

All patients’ written consent was obtained for the publication of any associated data.

Figures

Figure 1
Figure 1. Mmunohistochemistry for hormonal receptors in female breast cancer patients (A) Positive estrogen receptor (ER +Ve). (B) Negative estrogen receptor (ER −Ve). (C) Positive progesterone receptor (PR +Ve). (D) Negative progesterone receptor (PR −Ve). (E) Positive HER-2/neu (HER2 +Ve). (F) Negative HER-2/neu (HER2 −Ve). Black arrows pointed to nuclei and cytoplasm staining sites.
Figure 2
Figure 2. The expression of miR-34a, BRCA1, BRCA2 and p53 in the different subtypes vs. clinical stages, pre and post-chemotherapy. T: refers to tumor size, N: node status, M: metastasis.
Figure 3
Figure 3. The expression of miR-21 and Bcl-2 in the different subtypes vs. clinical stages, pre and post-chemotherapy. T: refers to tumor size, N: node status, M: metastasis
Figure 4
Figure 4. Pre-chemotherapy receiver operating characteristic (ROC) curve: (A) miR-34a (B) miR-21.
See this image and copyright information in PMC

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