BACKGROUND:Cytochrome P450 2A6 (CYP2A6) is known as an enzyme which is responsible for the metabolism of chemical compounds.AIM:This study aimed to analyse the relationship between CYP2A6 gene polymorphism with nicotine metabolism rates and lung cancer incidence among smokers of Batak ethnic group in Indonesia.METHODS:This study was a case-control study involving 140 research subjects through a purposive sampling technique from three hospitals in Medan, Indonesia. An examination of nicotine metabolism rates was conducted for all subjects using the 3HC/cotinine ratio parameter with LC-MS/MS technique. The examination of the CYP2A6 gene was performed with PCR-RFLP. Data were analysed with Conditional Logistic Regression test using Epi Info 7.0 software.RESULTS:The allele frequencies of CYP2A6*1A, CYP2A6*1B, and CYP2A6*4A found were 44.3%, 48.9%, and 6.8%, respectively. The *1B allele showed the highest metabolism rate. It is found that slow metabolizer individuals were 5.49 times more likely to develop lung cancer (P = 0.01, 95%CI 1.2-24.8).CONCLUSION:Among the Bataknese smokers studied, the CYP2A6*1B allele was found to be the most common allele and showed the highest rate of nicotine metabolism. However, the results show the insignificant relationship among CYP2A6 genetic polymorphism, nicotine metabolism, and lung cancer incidence.

AIM:This research aimed to analyse the relationship between CYP2A6 gene polymorphism with nicotine dependence and its relation to the number of cigarette consumption among Bataknese smokers.METHOD:This study was a cross-sectional study involving 140 research subjects in Medan, Indonesia.RESULTS:Nicotine dependence rates were found to be significantly associated with the number of cigarette consumption expressed in the Brinkman Index.CONCLUSION:The *1A wild-type alleles have a greater risk of high-very high dependence rate compared to the other variants.

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BACKGROUND: Tumor Necrosis Factor-alpha (TNF-α) is a pro-inflammatory cytokine that plays a role in immune response against tuberculosis (TB) infection. Polymorphism in TNF-α gene may be associated with susceptibility to pulmonary TB (PTB). AIM: The purpose of this study was to investigate whether TNF-α-308G/A gene polymorphism is associated with susceptibility to PTB in Medan city, Indonesia. METHODS: This is a case–control study with 100 PTB patients and 100 healthy control. TNF-α polymorphism genotyping was performed by polymerase chain reaction fragment length polymorphism method. RESULTS: There were 200 participants enrolled in this study. Most of the participants were male and were in the age range of 20–39 years. Genotyping examination revealed that in the TB group, AG and GG genotype was found in 80 people (80%) and 20 people (20%), respectively. There were no TB patients with AA genotypes. Whereas, in the control group, subjects with AA, AG, and GG genotypes were 2 (2%), 47 (47%), and 51 (51%), respectively. Statistical analysis showed that there was a significant relationship between TNF-α-308 G/A polymorphism and PTB, in which individuals with AG genotypes were 4.3 times more likely to suffer PTB compared to GG genotype (p < 0.001, 95% confidence interval (CI) 2.31–8.15). Further analysis showed that A allele increased the risk of TB incidence by 1.94-fold compared to the G allele (p = 0.002, 95% CI 1.27–2.98). CONCLUSIONS: There was a significant relationship between TNFα-308 G/A gene polymorphism and the susceptibility to PTB and A allele increases the risk of pulmonary TB compared to G allele.

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Introduction: Multidrug-resistant tuberculosis (MDR-TB) has become a new problem in the world. Many factors have been associated with MDR-TB occurrence. Some studies have demonstrated a role of vitamin D level and vitamin D receptor (VDR) gene polymorphism in MDR-TB. The aim of this study is to explore the role of FokI polymorphisms of the VDR gene and vitamin D level in MDR-TB occurrence in Medan city, Indonesia. Material and methods: This is a case-control study. Cases were 43 MDR-TB patients from the MDR-TB polyclinic Adam Malik Hospital in Medan, Indonesia. The control group comprised 56 new pulmonary TB cases with positive AFB sputum smear. Patients who were HIV positive, known to have diabetes mellitus or other severe disease, taking immunosuppressive drugs and vitamin D were excluded for both groups. Genetic polymorphisms of the VDR gene were analyzed using PCR-RFLP. Vitamin D level was analyzed using the ELISA procedure. Results: The frequencies of FokI genotypes were FF 39.5%, Ff 53.5%, ff 7.0% for MDR-TB patients and FF 39.3%, Ff 46.4.% and ff 14.3% for controls. There was no significant association between FokI genotype of the VDR gene and MDR-TB. Vitamin D level in MDR-TB was 53.5% sufficient, 39.5% insufficient and 7.0% deficient. Vitamin D level was 41.1% sufficient, 46.4% insufficient and 12.5% deficient in TB non-MDR. There was no significant association between vitamin D level and MDR-TB. Conclusions: No role of FokI polymorphism of the VDR gene and vitamin D level in MDR-TB occurrence was found.

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