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2016
Z. J. Yang, Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., and Yuan, K. F., Interleukin-8 -251A/T polymorphism and periodontitis susceptibility: a meta-analysis, vol. 15, no. 4, p. -, 2016.
Conflicts of interest The authors declare no conflict of interest. ACKNOWLEDGMENTS Research supported by a grant from the Second Hospital of Shandong University (#Y2013010062). REFERENCES Andia DC, de Oliveira NF, Letra AM, NocitiFHJret al (2011). Interleukin-8 gene promoter polymorphism (rs4073) may contribute to chronic periodontitis. J. Periodontol. 82: 893-899. http://dx.doi.org/10.1902/jop.2010.100513 Andia DC, Letra A, Casarin RC, Casati MZ, et al (2013). Genetic analysis of the IL8 gene polymorphism (rs4073) in generalized aggressive periodontitis. Arch. Oral Biol. 58: 211-217. http://dx.doi.org/10.1016/j.archoralbio.2012.05.008 Armitage GC, et al (1999). Development of a classification system for periodontal diseases and conditions. Ann. Periodontol. 4: 1-6. http://dx.doi.org/10.1902/annals.1999.4.1.1 Borilova Linhartova P, Vokurka J, Poskerova H, Fassmann A, et al (2013). Haplotype analysis of interleukin-8 gene polymorphisms in chronic and aggressive periodontitis. Mediators Inflamm. 2013: 342351. http://dx.doi.org/10.1155/2013/342351 Borrell LN, Papapanou PN, et al (2005). Analytical epidemiology of periodontitis. J. Clin. Periodontol. 32 (Suppl 6): 132-158. http://dx.doi.org/10.1111/j.1600-051X.2005.00799.x Campa D, Hung RJ, Mates D, Zaridze D, et al (2005). Lack of association between -251 T>A polymorphism of IL8 and lung cancer risk. Cancer Epidemiol. Biomarkers Prev. 14: 2457-2458. http://dx.doi.org/10.1158/1055-9965.EPI-05-0446 Deng H, Liu F, Pan Y, Jin X, et al (2011). BsmI, TaqI, ApaI, and FokI polymorphisms in the vitamin D receptor gene and periodontitis: a meta-analysis of 15 studies including 1338 cases and 1302 controls. J. Clin. Periodontol. 38: 199-207. http://dx.doi.org/10.1111/j.1600-051X.2010.01685.x DerSimonian R, Laird N, et al (1986). Meta-analysis in clinical trials. Control. Clin. Trials 7: 177-188. http://dx.doi.org/10.1016/0197-2456(86)90046-2 Dimou NL, Nikolopoulos GK, Hamodrakas SJ, Bagos PG, et al (2010). Fcgamma receptor polymorphisms and their association with periodontal disease: a meta-analysis. J. Clin. Periodontol. 37: 255-265. http://dx.doi.org/10.1111/j.1600-051X.2009.01530.x Dongari-Bagtzoglou AI, Ebersole JL, et al (1998). Increased presence of interleukin-6 (IL-6) and IL-8 secreting fibroblast subpopulations in adult periodontitis. J. Periodontol. 69: 899-910. http://dx.doi.org/10.1902/jop.1998.69.8.899 Dye BA, et al (2012). Global periodontal disease epidemiology. Periodontol. 2000 58: 10-25. http://dx.doi.org/10.1111/j.1600-0757.2011.00413.x Egger M, Davey Smith G, Schneider M, Minder C, et al (1997). Bias in meta-analysis detected by a simple, graphical test. BMJ 315: 629-634. http://dx.doi.org/10.1136/bmj.315.7109.629 Garza-Gonzalez E, Bosques-Padilla FJ, Mendoza-Ibarra SI, Flores-Gutierrez JP, et al (2007). Assessment of the toll-like receptor 4 Asp299Gly, Thr399Ile and interleukin-8 -251 polymorphisms in the risk for the development of distal gastric cancer. BMC Cancer 7: 70. http://dx.doi.org/10.1186/1471-2407-7-70 Goverdhan SV, Ennis S, Hannan SR, Madhusudhana KC, et al (2008). Interleukin-8 promoter polymorphism -251A/T is a risk factor for age-related macular degeneration. Br. J. Ophthalmol. 92: 537-540. http://dx.doi.org/10.1136/bjo.2007.123190 Higgins JP, Thompson SG, et al (2002). Quantifying heterogeneity in a meta-analysis. Stat. Med. 21: 1539-1558. http://dx.doi.org/10.1002/sim.1186 Hull J, Thomson A, Kwiatkowski D, et al (2000). Association of respiratory syncytial virus bronchiolitis with the interleukin 8 gene region in UK families. Thorax 55: 1023-1027. http://dx.doi.org/10.1136/thorax.55.12.1023 Ioannidis JP, Cappelleri JC, Lau J, et al (1998). Issues in comparisons between meta-analyses and large trials. JAMA 279: 1089-1093. http://dx.doi.org/10.1001/jama.279.14.1089 Ioannidis JP, Ntzani EE, Trikalinos TA, Contopoulos-Ioannidis DG, et al (2001). Replication validity of genetic association studies. Nat. Genet. 29: 306-309. http://dx.doi.org/10.1038/ng749 Jing L, Hong-yu Z, Dong-ying X, Juan L, et al (2011). Interleukin-8 -251 gene polymorphism in Chinese patients with aggressive periodontitis. J. Dental Prev. Treat. 19: 471-474. Kamali-Sarvestani E, Aliparasti MR, Atefi S, et al (2007). Association of interleukin-8 (IL-8 or CXCL8) -251T/A and CXCR2 +1208C/T gene polymorphisms with breast cancer. Neoplasma 54: 484-489. Khosropanah H, Sarvestani EK, Mahmoodi A, Golshah M, et al (2013). Association of IL-8 (-251 a/t) gene polymorphism with clinical parameters and chronic periodontitis. J. Dent. (Tehran) 10: 312-318. Kim YJ, Viana AC, Curtis KM, Orrico SR, et al (2009). Lack of association of a functional polymorphism in the interleukin 8 gene with susceptibility to periodontitis. DNA Cell Biol. 28: 185-190. http://dx.doi.org/10.1089/dna.2008.0816 Laine ML, Loos BG, Crielaard W, et al (2010). Gene polymorphisms in chronic periodontitis. Int. J. Dent. 2010: 324719. http://dx.doi.org/10.1155/2010/324719 Li G, Yue Y, Tian Y, Li JL, et al (2012). Association of matrix metalloproteinase (MMP)-1, 3, 9, interleukin (IL)-2, 8 and cyclooxygenase (COX)-2 gene polymorphisms with chronic periodontitis in a Chinese population. Cytokine 60: 552-560. http://dx.doi.org/10.1016/j.cyto.2012.06.239 Loos BG, John RP, Laine ML, et al (2005). Identification of genetic risk factors for periodontitis and possible mechanisms of action. J. Clin. Periodontol. 32 (Suppl 6): 159-179. http://dx.doi.org/10.1111/j.1600-051X.2005.00806.x Michalowicz BS, Aeppli D, Virag JG, Klump DG, et al (1991). Periodontal findings in adult twins. J. Periodontol. 62: 293-299. http://dx.doi.org/10.1902/jop.1991.62.5.293 Michalowicz BS, Diehl SR, Gunsolley JC, Sparks BS, et al (2000). Evidence of a substantial genetic basis for risk of adult periodontitis. J. Periodontol. 71: 1699-1707. http://dx.doi.org/10.1902/jop.2000.71.11.1699 Ramos-Corpas D, Santiago JC, et al (2006). Single large study or meta-analysis parameters: choosing the most appropriate tool for Down syndrome screening in the first trimester. Prenat. Diagn. 26: 1124-1130. http://dx.doi.org/10.1002/pd.1568 Sippert EA, de Oliveira e Silva C, Visentainer JE, Sell AM, et al (2013). Association of duffy blood group gene polymorphisms with IL8 gene in chronic periodontitis. PLoS One 8: e83286. http://dx.doi.org/10.1371/journal.pone.0083286 Tabor HK, Risch NJ, Myers RM, et al (2002). Candidate-gene approaches for studying complex genetic traits: practical considerations. Nat. Rev. Genet. 3: 391-397. http://dx.doi.org/10.1038/nrg796 Takigawa M, Takashiba S, Myokai F, Takahashi K, et al (1994). Cytokine-dependent synergistic regulation of interleukin-8 production from human gingival fibroblasts. J. Periodontol. 65: 1002-1007. http://dx.doi.org/10.1902/jop.1994.65.11.1002 Tamura M, Tokuda M, Nagaoka S, Takada H, et al (1992). Lipopolysaccharides of Bacteroides intermedius (Prevotella intermedia) and Bacteroides (Porphyromonas) gingivalis induce interleukin-8 gene expression in human gingival fibroblast cultures. Infect. Immun. 60: 4932-4937. Tsai CC, Ho YP, Chen CC, et al (1995). Levels of interleukin-1 beta and interleukin-8 in gingival crevicular fluids in adult periodontitis. J. Periodontol. 66: 852-859. http://dx.doi.org/10.1902/jop.1995.66.10.852 Vairaktaris E, Yapijakis C, Serefoglou Z, Derka S, et al (2007). The interleukin-8 (-251A/T) polymorphism is associated with increased risk for oral squamous cell carcinoma. Eur. J. Surg. Oncol. 33: 504-507. http://dx.doi.org/10.1016/j.ejso.2006.11.002 Yoshie H, Kobayashi T, Tai H, Galicia JC, et al (2007). The role of genetic polymorphisms in periodontitis. Periodontol. 2000 43: 102-132. http://dx.doi.org/10.1111/j.1600-0757.2006.00164.x Zhang N, Xu Y, Zhang B, Zhang T, et al (2014). Analysis of interleukin-8 gene variants reveals their relative importance as genetic susceptibility factors for chronic periodontitis in the Han population. PLoS One 9: e104436. http://dx.doi.org/10.1371/journal.pone.0104436
Z. J. Yang, Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., and Yuan, K. F., Interleukin-8 -251A/T polymorphism and periodontitis susceptibility: a meta-analysis, vol. 15, no. 4, p. -, 2016.
Conflicts of interest The authors declare no conflict of interest. ACKNOWLEDGMENTS Research supported by a grant from the Second Hospital of Shandong University (#Y2013010062). REFERENCES Andia DC, de Oliveira NF, Letra AM, NocitiFHJret al (2011). Interleukin-8 gene promoter polymorphism (rs4073) may contribute to chronic periodontitis. J. Periodontol. 82: 893-899. http://dx.doi.org/10.1902/jop.2010.100513 Andia DC, Letra A, Casarin RC, Casati MZ, et al (2013). Genetic analysis of the IL8 gene polymorphism (rs4073) in generalized aggressive periodontitis. Arch. Oral Biol. 58: 211-217. http://dx.doi.org/10.1016/j.archoralbio.2012.05.008 Armitage GC, et al (1999). Development of a classification system for periodontal diseases and conditions. Ann. Periodontol. 4: 1-6. http://dx.doi.org/10.1902/annals.1999.4.1.1 Borilova Linhartova P, Vokurka J, Poskerova H, Fassmann A, et al (2013). Haplotype analysis of interleukin-8 gene polymorphisms in chronic and aggressive periodontitis. Mediators Inflamm. 2013: 342351. http://dx.doi.org/10.1155/2013/342351 Borrell LN, Papapanou PN, et al (2005). Analytical epidemiology of periodontitis. J. Clin. Periodontol. 32 (Suppl 6): 132-158. http://dx.doi.org/10.1111/j.1600-051X.2005.00799.x Campa D, Hung RJ, Mates D, Zaridze D, et al (2005). Lack of association between -251 T>A polymorphism of IL8 and lung cancer risk. Cancer Epidemiol. Biomarkers Prev. 14: 2457-2458. http://dx.doi.org/10.1158/1055-9965.EPI-05-0446 Deng H, Liu F, Pan Y, Jin X, et al (2011). BsmI, TaqI, ApaI, and FokI polymorphisms in the vitamin D receptor gene and periodontitis: a meta-analysis of 15 studies including 1338 cases and 1302 controls. J. Clin. Periodontol. 38: 199-207. http://dx.doi.org/10.1111/j.1600-051X.2010.01685.x DerSimonian R, Laird N, et al (1986). Meta-analysis in clinical trials. Control. Clin. Trials 7: 177-188. http://dx.doi.org/10.1016/0197-2456(86)90046-2 Dimou NL, Nikolopoulos GK, Hamodrakas SJ, Bagos PG, et al (2010). Fcgamma receptor polymorphisms and their association with periodontal disease: a meta-analysis. J. Clin. Periodontol. 37: 255-265. http://dx.doi.org/10.1111/j.1600-051X.2009.01530.x Dongari-Bagtzoglou AI, Ebersole JL, et al (1998). Increased presence of interleukin-6 (IL-6) and IL-8 secreting fibroblast subpopulations in adult periodontitis. J. Periodontol. 69: 899-910. http://dx.doi.org/10.1902/jop.1998.69.8.899 Dye BA, et al (2012). Global periodontal disease epidemiology. Periodontol. 2000 58: 10-25. http://dx.doi.org/10.1111/j.1600-0757.2011.00413.x Egger M, Davey Smith G, Schneider M, Minder C, et al (1997). Bias in meta-analysis detected by a simple, graphical test. BMJ 315: 629-634. http://dx.doi.org/10.1136/bmj.315.7109.629 Garza-Gonzalez E, Bosques-Padilla FJ, Mendoza-Ibarra SI, Flores-Gutierrez JP, et al (2007). Assessment of the toll-like receptor 4 Asp299Gly, Thr399Ile and interleukin-8 -251 polymorphisms in the risk for the development of distal gastric cancer. BMC Cancer 7: 70. http://dx.doi.org/10.1186/1471-2407-7-70 Goverdhan SV, Ennis S, Hannan SR, Madhusudhana KC, et al (2008). Interleukin-8 promoter polymorphism -251A/T is a risk factor for age-related macular degeneration. Br. J. Ophthalmol. 92: 537-540. http://dx.doi.org/10.1136/bjo.2007.123190 Higgins JP, Thompson SG, et al (2002). Quantifying heterogeneity in a meta-analysis. Stat. Med. 21: 1539-1558. http://dx.doi.org/10.1002/sim.1186 Hull J, Thomson A, Kwiatkowski D, et al (2000). Association of respiratory syncytial virus bronchiolitis with the interleukin 8 gene region in UK families. Thorax 55: 1023-1027. http://dx.doi.org/10.1136/thorax.55.12.1023 Ioannidis JP, Cappelleri JC, Lau J, et al (1998). Issues in comparisons between meta-analyses and large trials. JAMA 279: 1089-1093. http://dx.doi.org/10.1001/jama.279.14.1089 Ioannidis JP, Ntzani EE, Trikalinos TA, Contopoulos-Ioannidis DG, et al (2001). Replication validity of genetic association studies. Nat. Genet. 29: 306-309. http://dx.doi.org/10.1038/ng749 Jing L, Hong-yu Z, Dong-ying X, Juan L, et al (2011). Interleukin-8 -251 gene polymorphism in Chinese patients with aggressive periodontitis. J. Dental Prev. Treat. 19: 471-474. Kamali-Sarvestani E, Aliparasti MR, Atefi S, et al (2007). Association of interleukin-8 (IL-8 or CXCL8) -251T/A and CXCR2 +1208C/T gene polymorphisms with breast cancer. Neoplasma 54: 484-489. Khosropanah H, Sarvestani EK, Mahmoodi A, Golshah M, et al (2013). Association of IL-8 (-251 a/t) gene polymorphism with clinical parameters and chronic periodontitis. J. Dent. (Tehran) 10: 312-318. Kim YJ, Viana AC, Curtis KM, Orrico SR, et al (2009). Lack of association of a functional polymorphism in the interleukin 8 gene with susceptibility to periodontitis. DNA Cell Biol. 28: 185-190. http://dx.doi.org/10.1089/dna.2008.0816 Laine ML, Loos BG, Crielaard W, et al (2010). Gene polymorphisms in chronic periodontitis. Int. J. Dent. 2010: 324719. http://dx.doi.org/10.1155/2010/324719 Li G, Yue Y, Tian Y, Li JL, et al (2012). Association of matrix metalloproteinase (MMP)-1, 3, 9, interleukin (IL)-2, 8 and cyclooxygenase (COX)-2 gene polymorphisms with chronic periodontitis in a Chinese population. Cytokine 60: 552-560. http://dx.doi.org/10.1016/j.cyto.2012.06.239 Loos BG, John RP, Laine ML, et al (2005). Identification of genetic risk factors for periodontitis and possible mechanisms of action. J. Clin. Periodontol. 32 (Suppl 6): 159-179. http://dx.doi.org/10.1111/j.1600-051X.2005.00806.x Michalowicz BS, Aeppli D, Virag JG, Klump DG, et al (1991). Periodontal findings in adult twins. J. Periodontol. 62: 293-299. http://dx.doi.org/10.1902/jop.1991.62.5.293 Michalowicz BS, Diehl SR, Gunsolley JC, Sparks BS, et al (2000). Evidence of a substantial genetic basis for risk of adult periodontitis. J. Periodontol. 71: 1699-1707. http://dx.doi.org/10.1902/jop.2000.71.11.1699 Ramos-Corpas D, Santiago JC, et al (2006). Single large study or meta-analysis parameters: choosing the most appropriate tool for Down syndrome screening in the first trimester. Prenat. Diagn. 26: 1124-1130. http://dx.doi.org/10.1002/pd.1568 Sippert EA, de Oliveira e Silva C, Visentainer JE, Sell AM, et al (2013). Association of duffy blood group gene polymorphisms with IL8 gene in chronic periodontitis. PLoS One 8: e83286. http://dx.doi.org/10.1371/journal.pone.0083286 Tabor HK, Risch NJ, Myers RM, et al (2002). Candidate-gene approaches for studying complex genetic traits: practical considerations. Nat. Rev. Genet. 3: 391-397. http://dx.doi.org/10.1038/nrg796 Takigawa M, Takashiba S, Myokai F, Takahashi K, et al (1994). Cytokine-dependent synergistic regulation of interleukin-8 production from human gingival fibroblasts. J. Periodontol. 65: 1002-1007. http://dx.doi.org/10.1902/jop.1994.65.11.1002 Tamura M, Tokuda M, Nagaoka S, Takada H, et al (1992). Lipopolysaccharides of Bacteroides intermedius (Prevotella intermedia) and Bacteroides (Porphyromonas) gingivalis induce interleukin-8 gene expression in human gingival fibroblast cultures. Infect. Immun. 60: 4932-4937. Tsai CC, Ho YP, Chen CC, et al (1995). Levels of interleukin-1 beta and interleukin-8 in gingival crevicular fluids in adult periodontitis. J. Periodontol. 66: 852-859. http://dx.doi.org/10.1902/jop.1995.66.10.852 Vairaktaris E, Yapijakis C, Serefoglou Z, Derka S, et al (2007). The interleukin-8 (-251A/T) polymorphism is associated with increased risk for oral squamous cell carcinoma. Eur. J. Surg. Oncol. 33: 504-507. http://dx.doi.org/10.1016/j.ejso.2006.11.002 Yoshie H, Kobayashi T, Tai H, Galicia JC, et al (2007). The role of genetic polymorphisms in periodontitis. Periodontol. 2000 43: 102-132. http://dx.doi.org/10.1111/j.1600-0757.2006.00164.x Zhang N, Xu Y, Zhang B, Zhang T, et al (2014). Analysis of interleukin-8 gene variants reveals their relative importance as genetic susceptibility factors for chronic periodontitis in the Han population. PLoS One 9: e104436. http://dx.doi.org/10.1371/journal.pone.0104436
Z. J. Yang, Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., Yuan, K. F., Yang, Z. J., Tang, X. P., Lai, Q. G., Ci, J. B., and Yuan, K. F., Interleukin-8 -251A/T polymorphism and periodontitis susceptibility: a meta-analysis, vol. 15, no. 4, p. -, 2016.
Conflicts of interest The authors declare no conflict of interest. ACKNOWLEDGMENTS Research supported by a grant from the Second Hospital of Shandong University (#Y2013010062). REFERENCES Andia DC, de Oliveira NF, Letra AM, NocitiFHJret al (2011). Interleukin-8 gene promoter polymorphism (rs4073) may contribute to chronic periodontitis. J. Periodontol. 82: 893-899. http://dx.doi.org/10.1902/jop.2010.100513 Andia DC, Letra A, Casarin RC, Casati MZ, et al (2013). Genetic analysis of the IL8 gene polymorphism (rs4073) in generalized aggressive periodontitis. Arch. Oral Biol. 58: 211-217. http://dx.doi.org/10.1016/j.archoralbio.2012.05.008 Armitage GC, et al (1999). Development of a classification system for periodontal diseases and conditions. Ann. Periodontol. 4: 1-6. http://dx.doi.org/10.1902/annals.1999.4.1.1 Borilova Linhartova P, Vokurka J, Poskerova H, Fassmann A, et al (2013). Haplotype analysis of interleukin-8 gene polymorphisms in chronic and aggressive periodontitis. Mediators Inflamm. 2013: 342351. http://dx.doi.org/10.1155/2013/342351 Borrell LN, Papapanou PN, et al (2005). Analytical epidemiology of periodontitis. J. Clin. Periodontol. 32 (Suppl 6): 132-158. http://dx.doi.org/10.1111/j.1600-051X.2005.00799.x Campa D, Hung RJ, Mates D, Zaridze D, et al (2005). Lack of association between -251 T>A polymorphism of IL8 and lung cancer risk. Cancer Epidemiol. Biomarkers Prev. 14: 2457-2458. http://dx.doi.org/10.1158/1055-9965.EPI-05-0446 Deng H, Liu F, Pan Y, Jin X, et al (2011). BsmI, TaqI, ApaI, and FokI polymorphisms in the vitamin D receptor gene and periodontitis: a meta-analysis of 15 studies including 1338 cases and 1302 controls. J. Clin. Periodontol. 38: 199-207. http://dx.doi.org/10.1111/j.1600-051X.2010.01685.x DerSimonian R, Laird N, et al (1986). Meta-analysis in clinical trials. Control. Clin. Trials 7: 177-188. http://dx.doi.org/10.1016/0197-2456(86)90046-2 Dimou NL, Nikolopoulos GK, Hamodrakas SJ, Bagos PG, et al (2010). Fcgamma receptor polymorphisms and their association with periodontal disease: a meta-analysis. J. Clin. Periodontol. 37: 255-265. http://dx.doi.org/10.1111/j.1600-051X.2009.01530.x Dongari-Bagtzoglou AI, Ebersole JL, et al (1998). Increased presence of interleukin-6 (IL-6) and IL-8 secreting fibroblast subpopulations in adult periodontitis. J. Periodontol. 69: 899-910. http://dx.doi.org/10.1902/jop.1998.69.8.899 Dye BA, et al (2012). Global periodontal disease epidemiology. Periodontol. 2000 58: 10-25. http://dx.doi.org/10.1111/j.1600-0757.2011.00413.x Egger M, Davey Smith G, Schneider M, Minder C, et al (1997). Bias in meta-analysis detected by a simple, graphical test. BMJ 315: 629-634. http://dx.doi.org/10.1136/bmj.315.7109.629 Garza-Gonzalez E, Bosques-Padilla FJ, Mendoza-Ibarra SI, Flores-Gutierrez JP, et al (2007). Assessment of the toll-like receptor 4 Asp299Gly, Thr399Ile and interleukin-8 -251 polymorphisms in the risk for the development of distal gastric cancer. BMC Cancer 7: 70. http://dx.doi.org/10.1186/1471-2407-7-70 Goverdhan SV, Ennis S, Hannan SR, Madhusudhana KC, et al (2008). Interleukin-8 promoter polymorphism -251A/T is a risk factor for age-related macular degeneration. Br. J. Ophthalmol. 92: 537-540. http://dx.doi.org/10.1136/bjo.2007.123190 Higgins JP, Thompson SG, et al (2002). Quantifying heterogeneity in a meta-analysis. Stat. Med. 21: 1539-1558. http://dx.doi.org/10.1002/sim.1186 Hull J, Thomson A, Kwiatkowski D, et al (2000). Association of respiratory syncytial virus bronchiolitis with the interleukin 8 gene region in UK families. Thorax 55: 1023-1027. http://dx.doi.org/10.1136/thorax.55.12.1023 Ioannidis JP, Cappelleri JC, Lau J, et al (1998). Issues in comparisons between meta-analyses and large trials. JAMA 279: 1089-1093. http://dx.doi.org/10.1001/jama.279.14.1089 Ioannidis JP, Ntzani EE, Trikalinos TA, Contopoulos-Ioannidis DG, et al (2001). Replication validity of genetic association studies. Nat. Genet. 29: 306-309. http://dx.doi.org/10.1038/ng749 Jing L, Hong-yu Z, Dong-ying X, Juan L, et al (2011). Interleukin-8 -251 gene polymorphism in Chinese patients with aggressive periodontitis. J. Dental Prev. Treat. 19: 471-474. Kamali-Sarvestani E, Aliparasti MR, Atefi S, et al (2007). Association of interleukin-8 (IL-8 or CXCL8) -251T/A and CXCR2 +1208C/T gene polymorphisms with breast cancer. Neoplasma 54: 484-489. Khosropanah H, Sarvestani EK, Mahmoodi A, Golshah M, et al (2013). Association of IL-8 (-251 a/t) gene polymorphism with clinical parameters and chronic periodontitis. J. Dent. (Tehran) 10: 312-318. Kim YJ, Viana AC, Curtis KM, Orrico SR, et al (2009). Lack of association of a functional polymorphism in the interleukin 8 gene with susceptibility to periodontitis. DNA Cell Biol. 28: 185-190. http://dx.doi.org/10.1089/dna.2008.0816 Laine ML, Loos BG, Crielaard W, et al (2010). Gene polymorphisms in chronic periodontitis. Int. J. Dent. 2010: 324719. http://dx.doi.org/10.1155/2010/324719 Li G, Yue Y, Tian Y, Li JL, et al (2012). Association of matrix metalloproteinase (MMP)-1, 3, 9, interleukin (IL)-2, 8 and cyclooxygenase (COX)-2 gene polymorphisms with chronic periodontitis in a Chinese population. Cytokine 60: 552-560. http://dx.doi.org/10.1016/j.cyto.2012.06.239 Loos BG, John RP, Laine ML, et al (2005). Identification of genetic risk factors for periodontitis and possible mechanisms of action. J. Clin. Periodontol. 32 (Suppl 6): 159-179. http://dx.doi.org/10.1111/j.1600-051X.2005.00806.x Michalowicz BS, Aeppli D, Virag JG, Klump DG, et al (1991). Periodontal findings in adult twins. J. Periodontol. 62: 293-299. http://dx.doi.org/10.1902/jop.1991.62.5.293 Michalowicz BS, Diehl SR, Gunsolley JC, Sparks BS, et al (2000). Evidence of a substantial genetic basis for risk of adult periodontitis. J. Periodontol. 71: 1699-1707. http://dx.doi.org/10.1902/jop.2000.71.11.1699 Ramos-Corpas D, Santiago JC, et al (2006). Single large study or meta-analysis parameters: choosing the most appropriate tool for Down syndrome screening in the first trimester. Prenat. Diagn. 26: 1124-1130. http://dx.doi.org/10.1002/pd.1568 Sippert EA, de Oliveira e Silva C, Visentainer JE, Sell AM, et al (2013). Association of duffy blood group gene polymorphisms with IL8 gene in chronic periodontitis. PLoS One 8: e83286. http://dx.doi.org/10.1371/journal.pone.0083286 Tabor HK, Risch NJ, Myers RM, et al (2002). Candidate-gene approaches for studying complex genetic traits: practical considerations. Nat. Rev. Genet. 3: 391-397. http://dx.doi.org/10.1038/nrg796 Takigawa M, Takashiba S, Myokai F, Takahashi K, et al (1994). Cytokine-dependent synergistic regulation of interleukin-8 production from human gingival fibroblasts. J. Periodontol. 65: 1002-1007. http://dx.doi.org/10.1902/jop.1994.65.11.1002 Tamura M, Tokuda M, Nagaoka S, Takada H, et al (1992). 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