Document Type: Research Articles
Department of Clinical and Chemical Pathology, Kasr Al Ainy Centre of Clinical Oncology and Nuclear Medicine, School of Medicine, Cairo University, Cairo, Egypt.
Department of Clinical Oncology, Kasr Al Ainy Centre of Clinical Oncology and Nuclear Medicine, School of Medicine, Cairo University, Cairo, Egypt.
Molecular oncology unit, Kasr Al-Ainy Centre of Clinical Oncology and Nuclear Medicine, School of Medicine, Cairo University, Cairo, Egypt.
Faculaty of Science, Cairo University, Cairo, Egypt.
Background: Breast cancer (BC) is the second most common cancer worldwide. MicroRNAs are a group of
non-coding, single stranded RNAs of ~ 22 nucleotides, which regulate gene expression at the post-transcriptional level.
Circulating miRNAs have been found as potential blood based predictive biomarkers. Purpose: we aim to evaluate
miR-34a and miR-125b to predict outcome from neoadjuvant chemotherapy in Egyptian BC patients. Methodology:
Quantitative assessment of plasma miR-34a and miR-125b expression was performed by qRT-PCR. Thirty nine
newly diagnosed locally advanced BC female patients with 10 age and sex matched healthy volunteers were included
in the study. Results: We performed ROC curve analysis to evaluate the diagnostic value for the miR-34a with
AUCs = 0.995, cutoff point of 2.57 sensitivity 97.4%, specificity 100%, PPV 100%, NPV 83.3% and accuracy 97.7%.
miR-125b had AUC = 0.68 and a cutoff point of 8.69 with sensitivity 66.7%, specificity 70.0%, PPV 90.6%, NPV
41.2% and accuracy 73.5%. miR-34a expression were significantly higher in BC patients compared to controls with p
value <0.001*. Also, miR-34a expression level was significantly higher in patients with progressive disease with P value
=0.03*. However, miR-125b expression levels were insignificantly higher in responsive patients with p value = 0.2.
Conclusion: miRNAs are crucial candidates for novel molecular targeted therapies due to their capability to regulate
numerous genes in molecular pathways. Our data suggest that circulating miR-34a and miR-125b expression levels
could be promising highly accurate non-invasive biomarkers in diagnosing BCs. miR-34a can predict chemotherapeutic
resistance associated with higher expression levels in non-responsive patients.