Tuberc Respir Dis.  2005 Apr;58(4):352-358.

Microsatellite Alterations of Plasma DNA in Non?Small Cell Lung Cancer

Affiliations
  • 1Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Korea. Kyc0923@jnu.ac.kr
  • 2Department of Pulmonology and Critical Care Medicine, Chonnam National University Medical School, South Korea.
  • 3Department of Forensic Medicine, Chonnam National University Medical School, South Korea.

Abstract

Microsatellites are short tandem repeated nucleotide sequences that are present throughout the human genome. Variations in the repeat number or a loss of heterozygosity around the microsatellites have been termed a microsatellite alteration (MA). A MA reflects the genetic instability caused by an impairment in the DNA mismatch repair system and is suggested to be a novel tumorigenic mechanism. A number of studies have reported that MA in the DNA extracted from the plasma occurs at varying frequencies among patients with a non-small cell lung carcinoma (NSCLC). The genomic DNA from 9 subjects with a non-small cell lung cancer (squamous cell cancer 6, adenocarcinoma 2, non-small cell lung cancer1) and 9 age matched non-cancer control subjects (AMC: tuberculosis 3, other inflammatory lung disease 6) and 12 normal control subjects (NC) were extracted from the peripheral blood leukocytes and plasma. Three microsatellite loci were amplified with the primers targeting the Gene Bank sequence D21S1245, D3S1300, and D3S1234. MA in the form of an allelic loss or a band shift was examined with 6% polyacrylamide gel electrophoresis and silver staining. None (0/12) of the NC subjects less than 40 years of age showed a MA in any of the three markers, while 88.9%(8/9) of the AMC above 40 showed a MA in at least one of the three markers (p<0.05). Sixty percent(6/10) of the control subjects with a smoking history showed a MA in one of the three markers, while 9.1%(1/11) of the control subjects without smoking history showed a MA (p<0.05). However, not only did 66.7%(6/9) of lung cancer patients show a MA in at least one of the three markers but so did 88.9%(8/21) of the AMC patients (p>0.05). In conclusion, a MA in the D21S1245, D3S1300, and D3S1234 loci using DNA extracted from the plasma was detected in 66.7% of lung cancer while no MA was found in the young non-smoking control subjects. However, many of the non-cancer control subjects (aged smokers) also showed a MA, which compromised the specificity of the MA analysis as a screening test. Therefore, a further study with a larger sample size will be needed.

Keyword

Non-Small Cell Lung cancer; Microsatellite Alteration; Plasma DNA

MeSH Terms

Adenocarcinoma
Base Sequence
Carcinoma, Non-Small-Cell Lung
DNA Mismatch Repair
DNA*
Electrophoresis, Polyacrylamide Gel
Genome, Human
Humans
Leukocytes
Loss of Heterozygosity
Lung Diseases
Lung Neoplasms*
Lung*
Mass Screening
Microsatellite Repeats*
Plasma*
Sample Size
Silver Staining
Smoke
Smoking
Tuberculosis
DNA
Smoke
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