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Updated: Jul 11, 2025
Author Spotlight: Advancements in Molecular Biomarker Testing for Non-Squamous Non-Small Cell Lung Cancer
Published on: September 8, 2023
Genome Wide Association Studies in Small-Cell Lung Cancer. A Systematic Review
José Ramón Enjo-Barreiro1, Alberto Ruano-Ravina2, Mónica Pérez-Ríos2
1Department of Preventive Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain; Service of Preventive Medicine, A Coruña University Teaching Hospital Complex, A Coruña, Spain.
Genome Wide Association Studies (GWAS) reveal genetic links to Small Cell Lung Cancer (SCLC). Key findings involve ASCL1 and chromosome 15 gene clusters like CHRNA5/A3/B4, potentially influencing SCLC development through receptor overexpression.
Area of Science:
- Oncology
- Genetics
- Epidemiology
Background:
- Small cell lung cancer (SCLC) is an aggressive malignancy with limited understanding of its genetic underpinnings.
- Genome-Wide Association Studies (GWAS) are crucial for identifying genetic risk factors in complex diseases like SCLC.
Purpose of the Study:
- To systematically review existing GWAS evidence for genetic associations in SCLC.
- To identify key genes and chromosomal regions implicated in SCLC susceptibility.
Main Methods:
- Systematic literature search of GWAS studies for SCLC conducted until July 31st, 2023.
- Inclusion of studies with anatomopathological confirmation of SCLC in human participants.
- Analysis of identified studies for reported genetic associations and gene expression patterns.
Main Results:
- Fourteen studies met the inclusion criteria.
- Eight studies linked ASCL1 overexpression to SCLC, potentially regulating the CHRNA5/A3/B4 cluster and nicotinic acetylcholine receptor (nAChR) overexpression.
- Nine studies identified a significant association between Single Nucleotide Polymorphisms (SNPs) on chromosome 15 and SCLC, with the CHRNA5/A3/B4 cluster being prominent.
Conclusions:
- GWAS have identified significant genetic factors associated with SCLC risk.
- The CHRNA5/A3/B4 gene cluster and ASCL1 appear to play a role in SCLC pathogenesis, possibly via nAChR pathways.
- Further research is needed to elucidate the precise mechanisms by which these genetic factors contribute to SCLC development, especially in relation to environmental exposures like NNK and NNN.
