Abstract 3809
Background
Dysregulation of various miRNAs has been linked to the initiation and progression of several cancers including acute myeloid leukemia (AML). However, their role in pediatric cytogenetically normal AML (CN-AML) is still unclear. The objective of the present study was to identify deregulated miRNA expression patterns and their correlation with survival outcome in pediatric CN-AML.
Methods
The study was approved by Institutional Ethical Committee. Informed written consent was taken from all the subjects. Bone marrow (BM) samples from 36 pediatric CN-AML patients and 20 pediatric controls (with solid tumors without BM involvement) were collected and used for isolation of mononuclear cells, genomic DNA and total RNA. Various clinical parameters were accessed and mutation status (NPM1 and FLT3-ITD) determined by PCR. Total RNA from 10 samples (5 CN-AML and 5 controls) was used for global miRNA profiling on Illumina HiSeq2500 platform and data were analysed using bioinformatic pipeline. For all 36 CN-AML patients, cDNA was prepared using TaqMan advanced miRNA cDNA synthesis kit followed by qPCR using TaqMan advanced miRNA assay for selected miRNAs.
Results
Global miRNA profiling revealed differential expression of 168 miRNAs of which 66 were upregulated and 102 were downregulated (fold change>1.5, p ≤ 0.05) in pediatric CN-AML patients. Interestingly, 40 miRNAs belonging to human 14q32 miRNA cluster were significantly downregulated in CN-AML patients. The expression of 11 miRNAs selected for qPCR-based validation based on their involvement in signalling pathways in AML (and other cancers), were found to be dysregulated in 36 patients. Most of these miRNAs were found to target genes involved in the initiation and progression of AML. Importantly, there was a significant correlation between expression levels of miR-75, miR-589, miR-4446, miR-889, and miR-654 and survival outcomes like Event-free, Disease-free, and Overall survival. Clinical parameters like TLC, ANC, LDH, Blast percentage were also significantly correlated with survival outcomes.
Conclusions
Along with various genetic abnormalities, deregulation in the expression of miRNAs might be an important contributor to the development of pediatric CN-AML.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Department of Biotechnology, Government of India.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
5105 - Fresh blood Immune cell monitoring in patients treated with nivolumab in the GETUG-AFU26 NIVOREN study: association with toxicity and treatment outcome
Presenter: Aude DESNOYER
Session: Poster Display session 3
Resources:
Abstract
1877 - Advanced clear-cell renal cell carcinoma (accRCC): association of microRNAs (miRNAs) with molecular subtypes, mRNA targets and outcome.
Presenter: Annelies Verbiest
Session: Poster Display session 3
Resources:
Abstract
5543 - Prior tyrosine kinase inhibitors (TKI) and antibiotics (ATB) use are associated with distinct gut microbiota ‘guilds’ in renal cell carcinoma (RCC) patients
Presenter: Valerio Iebba
Session: Poster Display session 3
Resources:
Abstract
2689 - mTOR mutations are not associated with shorter PFS and OS in patients treated with mTOR inhibitors
Presenter: Cristina Suarez Rodriguez
Session: Poster Display session 3
Resources:
Abstract
3069 - Efficacy of immune checkpoint inhibitors (ICI) and genomic alterations by body mass index (BMI) in Advanced Renal Cell Carcinoma (RCC)
Presenter: Aly-Khan Lalani
Session: Poster Display session 3
Resources:
Abstract
5089 - Finding the Right Biomarker for Renal Cell Carcinoma (RCC): Nivolumab treatment induces the expression of specific peripheral lymphocyte microRNAs in patients with durable and complete response.
Presenter: Lorena Incorvaia
Session: Poster Display session 3
Resources:
Abstract
2594 - Algorithms derived from quantitative pathology can be a gatekeeper in patient selection for clinical trials in localised clear cell renal cell carcinoma (ccRCC)
Presenter: In Hwa Um
Session: Poster Display session 3
Resources:
Abstract
2566 - High baseline blood volume is an independent favorable prognostic factor for overall and progression-free survival in patients with metastatic renal cell carcinoma
Presenter: Aska Drljevic-nielsen
Session: Poster Display session 3
Resources:
Abstract
2675 - Impact of estimand selection on adjuvant treatment outcomes in renal cell carcinoma (RCC)
Presenter: Daniel George
Session: Poster Display session 3
Resources:
Abstract
1541 - TERT gene fusions characterize a subset of metastatic Leydig cell tumors
Presenter: Bozo Kruslin
Session: Poster Display session 3
Resources:
Abstract