A case-control study on association of SULT1A1 polymorphism, smoked meat intake with breast cancer risk / 中华预防医学杂志

<p><b>OBJECTIVE</b>To assess the association of smoked meat intake, SULT1A1 polymorphism as well as their combined effects with breast cancer risk.</p><p><b>METHODS</b>A total of 400 newly diagnosed breast cancer cases from a cancer hospital in Sichuan province and 400 healthy controls from participants of physical examination in a hospital in Chengdu city were recruited from May 2007 to July 2009. A valid questionnaire was designed to collect their demographic characteristics and breast cancer risk factors. Daily intake of foods was collected using semi-quantitative frequency questionnaire and then the daily intake of smoked meat was calculated and transformed to energy-adjusted smoked meat intake by the residual method. Gene sequencing was used to analyze SULT1A1 Arg213His genotypes. Multivariable conditional logistic regression was used to estimate adjusted odds ratios (ORs) and 95% confidence intervals (95%CIs).</p><p><b>RESULTS</b>The energy-adjusted daily intake of smoked meat (Median (P₂₅, P₇₅)) was 8.65 (3.63, 18.44) g/d in cases and 4.44 (0.19, 8.71) g/d in controls. The frequency of SULT1A1 variant allele was 14.75% (59/400) among cases and 12.75% (51/400) among controls. High energy-adjusted daily intake of smoked meat (≥ 4.44 g/d) was significantly associated with breast cancer risk among premenopausal (OR = 2.31, 95%CI: 1.46 - 3.66) and postmenopausal subjects (OR = 3.13, 95%CI: 1.89 - 5.17). High energy-adjusted daily intake of smoked meat combined with carrying SULT1A1 variant allele elevated breast cancer risk among premenopausal (OR = 3.31, 95%CI: 1.66 - 6.62) and postmenopausal subjects (OR = 3.81, 95%CI: 1.79 - 8.10).</p><p><b>CONCLUSION</b>High smoked meat intake contributes to high risk of breast cancer. SULT1A1 variant allele increases breast cancer risk among subjects who were exposed to high smoked meat intake.</p>

Genetic variation in genes involved in folate and drug metabolism in a south Indian population.

BACKGROUND: Genetic variations represented as single nucleotide polymorphisms (SNPs) vary across the world population. This genetic polymorphism (such as SNPs) plays an important role in pharmacogenomics. SNPs that affects cellular metabolism, by altering the enzyme activity, have an important role in therapeutic outcome. Allele frequencies in number of clinically relevant SNPs within south Indian populations are not yet known. Hence, we genotyped randomly selected unrelated south Indian subjects from different locations of south India representing the heterogeneous ethnic background of the population. MATERIALS AND METHODS: Common variants of MTHFD1, TYMS, SHMT1, MTR, MTRR, CBS and SULT1A1 gene polymorphisms were screened from healthy unrelated south Indian volunteers. Genotypes were determined using RFLP analysis of polymerase chain reaction-amplified products and confirmed by DNA sequencing. Chi-square test was performed to test for deviation from the Hardy-Weinberg equilibrium for each locus. RESULTS: Gene allele frequency for several polymorphisms in our study differed significantly between the populations of other nations reported for several of the SNPs. These results demonstrate that the populations in different geographic regions may have widely varying genetic allele frequencies for clinically relevant SNPs. CONCLUSION: The present study reports, for the first time, the frequency distribution of MTHFD1, TYMS, SHMT1, MTR, MTRR, CBS and SULTIA1 gene polymorphisms in a south Indian population. Population-specific genetic polymorphism studies will help in practicing pharmacogenomic principles in the clinics.

A case-control study on the association between the genetic polymorphism of sulfotransferase 1A1, diet and susceptibility of colorectal cancer / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To investigate the relationship between sulfotransferase 1Al polymorphism, diet and colorectal cancer susceptibility.</p><p><b>METHODS</b>A case-control study of 140 cancers and 343 health controls was conducted to investigate the role of sulfotransferase 1A1 polymorphism and meat consumption in colorectal carcinogenesis. Genotypes of sulfotransferase 1A1 polymorphism were analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).</p><p><b>RESULTS</b>There was no significant difference in allele frequency of SULT1A1 between the control and cancer patient populations. After adjustment for age, sex, smoking and history of diseases, red meat and well-done meat intake showed no significant association with colorectal cancer. Consumption of red meat more than 5 kg per year combined with SULT1Al slow sulfation (Arg/His and His/His) had a statistically significant association with the risk of rectal cancer ( OR = 3.78; 95% CI: 1.08 - 13. 20) compared to that consumed red meat less than 5 kg per year with fast sulfation (Arg/Arg).</p><p><b>CONCLUSION</b>This study suggests that SULT1A1 slow sulfation combined with higher intake of red meat may be associated with an elevated risk of rectal cancer.</p>

Study on the relationship between polymorphisms of genes (CYP17, CYP19 and SULT1A1) and susceptibility to breast cancer in Chinese women / 中华流行病学杂志

<p><b>OBJECTIVE</b>To investigate the relationship between polymorphisms of genes (CYP17, CYP19 and SULT1A1) involved in estrogen metabolism and susceptibility to breast cancer in Chinese women.</p><p><b>METHODS</b>A case-control study was performed. PCR-base restriction fragment length polymorphism (PCR-RFLP) and short tandem repeat polymorphism (STRP) assays were used to detect the polymorphism distribution of CYP17, CYP19 and SULT1A1 in 213 breast cancer cases and 430 matched controls. Logistic regression analyses were used to determine the OR, multivariate adjusted OR and 95% CI of each and all three genes and estrogen exposure factors on the risk of breast cancer. Relationship between polymorphisms and clinic-pathological features was also assessed.</p><p><b>RESULTS</b>The frequency of A2 allele of CYP17 was 49.8% in cases and 49.1% in controls (P > 0.05). The frequency His allele of SULT1A1 in cases (13.6%) was significant higher than that of controls (9.5%) (P = 0.03). There was also significant difference in the frequencies of (TTTA)10 allele CYP19 which was 12.4% in cases and 8.2% in controls (P = 0.02). Multigenic model indicated that there was an increased risk of breast cancer with more numbers of high-risk genotypes in a dose-response effect (trend P = 0.05). Data from multivariate analysis showed that the allele of SULT1A1 His and CYP19 (TTTA)10 was positively associated with the risk of breast cancer. Other well-established risk factors as higher estrogen exposure including total years of menstrual, early menarche etc, and women with a higher BMI and WHR were all served as independent risks.</p><p><b>CONCLUSION</b>This study indicated that the polymorphisms of estrogen-metabolizing genes were related to breast cancer.</p>

Polymorphisms of estrogen-metabolizing genes and breast cancer risk: a multigenic study / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Endogenous estrogen plays a very important role in the carcinogenesis and progression of breast cancer. The enzymes involved in the biosynthesis and metabolism of estrogen have been proposed to contribute to this effect. To examine this hypothesis, we conducted a case-control study to investigate the relationship between polymorphisms of genes responsible for estrogen biosynthesis (CYP17, cytochrome P450c17a and CYP19, aromatase cytochrome P450) and estrogen sulfation of inactivation (SULT1A1, sulfotransferase1A1) and the risk of breast cancer in Chinese women.</p><p><b>METHODS</b>This study involved 213 breast cancer patients and 430 matched controls. PCR-based restriction fragment length polymorphism (RFLP) and short tandem repeat polymorphism (STRP) assays were used to detect the mononucleotide transition of CYP17 and SULT1A1 and tandem repeat polymorphism of CYP19. Logistic regression analyses were used to determine OR and 95% CI of each and all three high-risk genotypes, of all three genotypes combined, and of estrogen exposure factors. The relationship between each high-risk genotype and clinicalpathological characteristics were also assessed.</p><p><b>RESULTS</b>The frequency of A2 allele of CYP17 was 49.8% in cases and 49.1% in controls (P = 0.82). The frequency of His allele of SULT1A1 was significantly higher in cases (13.6%) than in controls (9.5%) (P < 0.05). There was also significant difference of the (TTTA) 10 allele of CYP19 which was 12.4% in cases and 8.2% in controls (P < 0.05). When the CYP17 A2 allele, CYP19 (TTTA) 10 and SULT1A1 His allele were considered as the "putative high-risk" genotype, there was an increased risk of breast cancer with the number of high-risk genotypes in a dose-response effect (trend, P = 0.05). In multivariate analysis, the SULT1A1 genotype remained the most significant determinant for breast cancer, with OR = 2.37 (95% CI 1.23-4.74), followed by CYP19, with OR = 1.75 (95% CI 1.27-3.56). The (TTTA) 10 allele of CYP19 was associated with tumor size, and the His allele of SULT1A1 associated with status of lymph node metastasis.</p><p><b>CONCLUSIONS</b>This study supports the hypothesis that breast cancer can be initiated by estrogen exposure and that estrogen metabolizing genes are involved in this mechanism. This multigenic model is useful for identifying individuals who are at higher risks of breast cancer.</p>