MicroRNA 21 and microRNA 10b: early diagnostic biomarkers of breast cancer in Egyptian females

Assessment of miRNA-10b Expression Levels as a Potential Precursor to Metastasis in Localized and Locally Advanced/Metastatic Breast Cancer among Iraqi Patients

Breast cancer (BC) stands as the most prevalent form of carcinoma among women, ranking as the second leading cause of cancer-related mortality in the female population. The objective of this study is to assess the expression of miR-10b and determine its diagnostic and prognostic significance in breast cancer patients across various disease stages. The investigation was carried out in Baghdad at the Oncology Teaching Hospital within Baghdad Medical City and the Oncology Unit at Al-Yarmouk Teaching Hospital. A total of 150 samples were included and divided into two groups: the blood group consisting of 90 samples (including control subjects, localized BC patients, and those with metastatic and locally advanced BC) and the tissue group comprising 60 samples (representing both benign and malignant BC cases). The study spanned from March 2022 to January 2023, with patients' ages ranging from 24 to 75 years. The primary focus of this investigation was to identify the gene expression of miRNA-10b in all sample types. This was achieved by measuring gene expression levels and normalizing them to the level of a housekeeping gene (U6), and quantification was carried out considering the ΔCt value and the fold change method (2-ΔΔCt). The results revealed an upregulated fold expression of miRNA-10b, particularly in locally advanced and metastatic BC, where the expression was significantly higher compared to the other groups, with a fold expression of 1.770 ± 0.1070. In localized breast cancer, the fold expression was 1.624 ± 0.064, and in malignant tissue, it measured 1.546 ± 0.06754, all relative to apparently healthy control subjects. In summary, our research provides compelling evidence supporting the classification of miRNA-10b as an oncogenic factor in BC. The central involvement of miRNA-10b in the tumorigenic processes of BC highlights its reference for developing novel targeted therapeutic interventions and detection biomarkers for BC treatment. Notably, elevated expression of miRNA-10b was observed in BC tissues, correlating with an unfavorable distant metastasis-free survival outcome.

Signature of miR-21 and MEG-2 and their correlation with TGF-β signaling in breast cancer

Breast cancer is highly prevalent and considered the main challenge to public health among females in Egypt as in other countries. MicroRNA-21 (miR-21) and MEG-2 are noncoding RNA attributed to their aberrant expression in several diseases, including breast cancer. This study aimed to assess the reliability of serum expression levels of miR-21 and MEG-2 in discriminating stages of breast cancer and scrutinize their correlations with the targeted transforming growth factor-beta (TGF-β) expression. One hundred and 30 participants whose ages ranged from 28 to 62 years were included in this study, divided into one hundred breast cancer patients and 30 healthy participants. miR-21 and TGF-β expression levels showed upregulation in patients with BC and elevated miR-21/TGF-β levels consistent with the BC stage. In addition, LncRNA (MEG-2) showed down-regulation in patients with BC. MEG-2 expression levels revealed a gradual decrease consistent with the BC stage. In addition, a negative relationship between the MEG-2 and the miR-21 and TGF-β differential expression was also noticed. This study suggested that miR-21 and MEG-2 can be used as prospective diagnostic biomarkers and emphasized the crucible role of TGF-β as therapeutic targets for BC.

Cancer Biomarkers in Liquid Biopsy for Early Detection of Breast Cancer: A Systematic Review

Background:

Breast cancer (BC) is the most common neoplasm in women worldwide. Liquid biopsy (LB) is a non-invasive diagnostic technique that allows the analysis of biomarkers in different body fluids, particularly in peripheral blood and also in urine, saliva, nipple discharge, volatile respiratory fluids, nasal secretions, breast milk, and tears. The objective was to analyze the available evidence related to the use of biomarkers obtained by LB for the early diagnosis of BC.

Methods:

Articles related to the use of biomarkers for the early diagnosis of BC due to LB, published between 2010 and 2022, from the databases (WoS, EMBASE, PubMed, and SCOPUS) were included. The MInCir diagnostic scale was applied in the articles to determine their methodological quality (MQ). Descriptive statistics were used, as well as determination of weighted averages of each variable, to analyze the extracted data. Sensitivity, specificity, and area under the curve values for specific biomarkers (individual or in panels) are described.

Results:

In this systematic review (SR), 136 articles met the selection criteria, representing 17 709 patients with BC. However, 95.6% were case-control studies. In 96.3% of cases, LB was performed in peripheral blood samples. Most of the articles were based on microRNA (miRNA) analysis. The mean MQ score was 25/45 points. Sensitivity, specificity, and area under the curve values for specific biomarkers (individual or in panels) have been found.

Conclusions:

The determination of biomarkers through LB is a useful mechanism for the diagnosis of BC. The analysis of miRNA in peripheral blood is the most studied methodology. Our results indicate that LB has a high sensitivity and specificity for the diagnosis of BC, especially in early stages.