生物谷報道：在JAMA雜志最近一篇文章中,，美國Fred Hutchinson癌癥研究中心研究人員通過統(tǒng)計分析發(fā)現(xiàn),，幾種腫瘤遺傳易感性相關(guān)的候選基因多態(tài)性。
Dong教授等收集了2008年3月間,，與腫瘤遺傳易感性和基因多態(tài)性有關(guān)的161 meta分析研究報道,，涉及到18種腫瘤、99個基因,、344個突變類型,，其中98個突變（28%）優(yōu)勢比（OR值）具有統(tǒng)計學(xué)意義，進一步行驗前概率（0.001）和假陽性報道預(yù)測（FPRP<0.2）分析,，有13個突變有顯著意義,。進一步提高標準后得到4個突變：谷胱苷肽S轉(zhuǎn)移酶M1(GSTM1)空白基因型、NAT2快速乙?；蛐团c膀胱癌,；亞甲基四氫葉酸還原酶(MTHFR)基因C677T突變型與胃癌；GSTM1空白基因型與白血病,。
研究者發(fā)現(xiàn),，近三分之一的突變類型同腫瘤遺傳易感性相關(guān)，其中很多編碼代謝相關(guān)的酶類,。
生物谷推薦原始出處：
CLINICIAN'S CORNER
Genetic Susceptibility to Cancer
The Role of Polymorphisms in Candidate Genes
Linda M. Dong, MPH, PhD; John D. Potter, MD, PhD; Emily White, PhD; Cornelia M. Ulrich, PhD; Lon R. Cardon, PhD; Ulrike Peters, PhD, MPH
JAMA. 2008;299(20):2423-2436.
Context Continuing advances in genotyping technologies and the inclusion of DNA collection in observational studies have resulted in an increasing number of genetic association studies.
Objective To evaluate the overall progress and contribution of candidate gene association studies to current understanding of the genetic susceptibility to cancer.
Data Sources We systematically examined the results of meta-analyses and pooled analyses for genetic polymorphisms and cancer risk published through March 2008.
Study Selection We identified 161 meta-analyses and pooled analyses, encompassing 18 cancer sites and 99 genes. Analyses had to meet the following criteria: include at least 500 cases, have cancer risk as outcome, not be focused on HLA antigen genetic markers, and be published in English.
Data Extraction Information on cancer site, gene name, variant, point estimate and 95% confidence interval (CI), allelic frequency, number of studies and cases, tests of study heterogeneity, and publication bias were extracted by 1 investigator and reviewed by other investigators.
Results These 161 analyses evaluated 344 gene-variant cancer associations and included on average 7.3 studies and 3551 cases (range, 508-19 729 cases) per investigated association. The summary odds ratio (OR) for 98 (28%) statistically significant associations (P value <.05) were further evaluated by estimating the false-positive report probability (FPRP) at a given prior probability and statistical power. At a prior probability level of 0.001 and statistical power to detect an OR of 1.5, 13 gene-variant cancer associations remained noteworthy (FPRP <0.2). Assuming a very low prior probability of 0.000001, similar to a probability assumed for a randomly selected single-nucleotide polymorphism in a genome-wide association study, and statistical power to detect an OR of 1.5, 4 associations were considered noteworthy as denoted by an FPRP value <0.2: GSTM1 null and bladder cancer (OR, 1.5; 95% CI, 1.3-1.6; P = 1.9 x 10–14), NAT2 slow acetylator and bladder cancer (OR, 1.46; 95% CI, 1.26-1.68; P = 2.5 x 10–7), MTHFR C677T and gastric cancer (OR, 1.52; 95% CI, 1.31-1.77; P = 4.9 x 10–8), and GSTM1 null and acute leukemia (OR, 1.20; 95% CI, 1.14-1.25; P = 8.6 x 10–15). When the OR used to determine statistical power was lowered to 1.2, 2 of the 4 noteworthy associations remained so: GSTM1 null with bladder cancer and acute leukemia.
Conclusion In this review of candidate gene association studies, nearly one-third of gene-variant cancer associations were statistically significant, with variants in genes encoding for metabolizing enzymes among the most consistent and highly significant associations.
Author Affiliations: Fred Hutchinson Cancer Research Center, Seattle, Washington (Drs Dong, Potter, White, Ulrich, Cardon, and Peters) and Departments of Epidemiology (Drs Dong, Potter, White, Ulrich, and Peters) and Biostatistics (Dr Cardon), University of Washington, Seattle.
