Microsatellite alterations in non-small cell lung cancer

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• Non-small cell lung cancer (NSCLC) is a leading cause of cancer death worldwide.
• Microsatellite alterations are common genetic changes observed in various cancers.
• Tobacco smoking is a major risk factor for lung cancer.

Purpose of the Study:

• To investigate the frequency of microsatellite alterations in Thai patients with non-small cell lung cancer.
• To determine the association between tobacco smoking and microsatellite alterations in this patient cohort.

Main Methods:

• Analysis of genetic alterations at 12 dinucleotide repeat loci on chromosomes 2, 3, 12, and 17.
• Microsatellite instability analysis in tumor samples from 30 Thai NSCLC patients.
• Statistical analysis, including Fisher's exact test and odds ratio calculation, to assess the association with smoking history.

Main Results:

• Microsatellite alterations were detected in 17 out of 30 (57%) NSCLC cases.
• A significantly higher frequency of microsatellite alterations was observed in smokers (74%) compared to non-smokers (26%) (P = 0.01).
• The odds ratio for microsatellite alterations in smokers versus non-smokers was 7.47.

Conclusions:

• Microsatellite alterations are prevalent in non-small cell lung cancer among Thai patients.
• Tobacco smoking is strongly associated with an increased frequency of microsatellite alterations in NSCLC.
• These findings highlight the potential role of smoking-induced genetic instability in lung carcinogenesis.