Psoriatic arthritis epidemiology
Year 2014,
Volume: 19 Issue: 1, 1 - 7, 29.04.2014
Göknur Kalkan
,
Ayşe Serap Karadağ
Abstract
Psoriatic arthritis (PsA) is a chronic inflammatory arthritis that can cause severe joint deformities and disability. The expected prevalence of inflammatory arthritis among patients with psoriasis has varied from 7% to 40%. Early diagnosis and treatment of PsA is recommended to discourage from disease associated disability and breakdown of work place efficiency. The epidemiological studies are quite limited because of small and selective study populations, limited follow-up, and absence of validated PsA classification criteria. The epidemiology of psoriatic arthritis has been reviewed in this manuscript by summarizing incidence and prevalence estimates up to date and epidemiological studies indicating the degree of genetic load of PsA. Potential risk factors like demographic features, characteristics of psoriasis lesions and the effect of environmental and hormonal factors in epidemiological spectrum of psoriatic arthritis are analyzed.
References
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- Gladman DD, Antoni C, Mease P, et al. Psoriatic arthritis:epidemiology, clinical features, course, and outcome. Ann Rheum Dis 2005; 64: 14-17.
- Chandran V, Raychaudhuri SP. Geoepidemiology and environmental factors of psoriasis and psoriatic arthritis. J Autoimmun 2010; 34: 314-321.
- Ackermann C, Kavanaugh A. Economic burden of psoriatic arthritis. Pharmacoeconomics 2008; 26: 121– 1
- McHugh NJ, Balachrishnan C, Jones SM. Progression of peripheral joint disease in psoriatic arthritis: a 5-yr prospective study. Rheumatology (Oxford) 2003; 42: 778-7
- Bond SJ, Farewell VT, Schentag CT, Gladman DD. Predictors for radiological damage in psoriatic arthritis: results from a single centre. Ann Rheum Dis 2007; 66: 370–376.
- Kane D, Stafford L, Bresnihan B, FitzGerald O. A prospective, clinical and radiological study of early psoriatic arthritis: an early synovitis clinic experience. Rheumatology (Oxford) 2003; 42: 1460–1468.
- Kavanaugh AF, Ritchlin CT. Systematic review of treatments for psoriatic arthritis: an evidence based approach and basis for treatment guidelines. J Rheumatol 2006; 33: 1417-1421.
- Moll J, Wright V. Psoriatic arthritis. Semin Arthritis Rheum 1973; 3: 55-78.
- Helliwell P, Taylor W. Classification and diagnostic criteria for psoriatic arthritis. Ann Rheum Dis 2005; 64: 3Taylor W, Marchesoni A, Arreghini M, Sokol K, Helliwell P. A comparison of the performance characteristics of classification criteria for the diagnosis of psoriatic arthritis. Semin Arthritis Rheum 2004; 34: 575-584.
- Taylor W, Helliwell P, Gladman D, et al. A validation of current classification criteria for the diagnosis of psoriatic arthritispreliminary results of the CASPAR Study. Ann Rheum Dis 2005; 64: 107.
- Taylor W, Gladman D, Helliwell P, et al. Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum 2006; 54: 2665-2673.
- Chandran V, Schentag CT, Gladman DD. Sensitivity of the classification of psoriatic arthritis criteria in early psoriatic arthritis.Arthritis Rheum 2007; 57: 1560-1563.
- Alamanos Y, Voulgari PV, Drosos AA. Incidence and prevalence of psoriatic arthritis: a systematic review. J Rheumatol 2008; 35: 1354-1358.
- Scarpa R, Cosentini E, Manguso F, et al. Clinical and genetic aspects of psoriatic arthritis “sine psoriasis”. J Rheumatol 2003; 30: 2638-2640.
- Pedersen OB, Junker P. On the applicability of the CASPAR criteria in psoriatic arthritis. Ann Rheum Dis 2008; 67: 1495-1496.
- Pedersen OB, Svendsen AJ, Ejstrup L, Skytthe A, Junker P. The occurrence of psoriatic arthritis in Denmark. Ann Rheum Dis 2008; 67: 1422-1426.
- Hellgren L. Association between rheumatoid arthritis and psoriasis in total populations. Acta Rheumatol Scand. 1969; 15: 316-326. van Romunde LK, Valkenburg HA, Swart-Bruinsma W, Cats A, Hermans J. Psoriasis and arthritis. I. A population study. Rheumatol Int 1984; 4: 55-60.
- Saraux A, Guillemin F, Guggenbuhl P, et al. Prevalence of spondyloarthropathies in France: 2001. Ann Rheum Dis 2005; 64: 1431-1435.
- Alamanos Y, Papadopoulos NG, Voulgari PV, et al. Epidemiology of psoriatic arthritis in northwest Greece, 1982-2001. J Rheumatol 2003; 30: 264126
- Trontzas P, Andrianakos A, Miyakis S, et al. ESORDIG study group. Seronegative spondyloarthropathies in Greece: a population-based study of prevalence, clinical pattern, and management. The ESORDIG study. Clin Rheumatol 2005; 24: 5835
- Madland TM, Apalset EM, Johannessen AE, Rossebö B, Brun JG. Prevalence, disease manifestations, and treatment of psoriatic arthritis in Western Norway. J Rheumatol 2005; 32: 1918-1922.
- Love TJ, Gudbjornsson B, Gudjonsson JE, Valdimarsson H. Psoriatic arthritis in Reykjavik, Iceland: prevalence, demographics, and disease course. J Rheumatol 2007; 34: 2082-2088.
- De Angelis R, Salaffi F, Grassi W. Prevalence of spondyloarthropathies in an Italian population sample: a regional community-based study. Scand J Rheumatol 2007; 36: 14-21. Shbeeb M, Uramoto KM, Gibson LE, O'Fallon WM, Gabriel SE. The epidemiology of psoriatic arthritis in Olmsted County, Minnesota, USA, 198219 J Rheumatol 2000; 27: 1247-1250.
- Wilson FC, Icen M, Crowson CS, et al. Time trends in epidemiology and characteristics of psoriatic arthritis over 3 decades: a population-based study. J Rheumatol 2009; 36: 361-367. Gelfand JM, Gladman DD, Mease PJ, et al. Epidemiology of psoriatic arthritis in the population of the United States. J Am Acad Dermatol 2005; 53: 5 Hukuda S, Minami M, Saito T, et al. Spondyloarthropathies in Japan: nationwide questionnaire survey performed by the Japan Ankylosing Spondylitis Society. J Rheumatol 2001; 28: 554-559.
- Zeng QY, Chen R, Darmawan J, et al. Rheumatic diseases in China. Arthritis Res Ther 2008; 10: 17. Minaur N, Sawyers S, Parker J, Darmawan J. Rheumatic disease in an Australian Aboriginal community in North Queensland, Australia. A WHOILAR COPCORD survey. J Rheumatol 2004; 31: 9659
- Gladman DD. Clinical, radiological, and functional assessment in psoriatic arthritis: is it different from other inflammatory joint diseases? Ann Rheum Dis 2006; 65:22-24.
- Ibrahim G, Waxman R, Helliwell PS. The prevalence of psoriatic arthritis in people with psoriasis. Arthritis Rheum 2009; 61: 1373-1378.
- Wilson FC, Icen M, Crowson CS, et al. Incidence and clinical predictors of psoriatic arthritis in patients with psoriasis: a population-based study. Arthritis Rheum 2009; 61: 233-239. Gisondi P, Girolomoni G, Sampogna F, Tabolli S, Abeni D. Prevalence of psoriatic arthritis and joint complaints in a large population of Italian patients hospitalised for psoriasis. Eur J Dermatol 2005; 15: 279-2
- Scarpa R, Oriente P, Pucino A, et al. Psoriatic arthritis in psoriatic patients. Br J Rheumatol 1984; 23: 2462 Salvarani C, Lo Scocco G, Macchioni P, et al.
- Prevalence of psoriatic arthritis in Italian psoriatic patients. J Rheumatol 1995; 22: 1499-1503. Alenius GM, Stenberg B, Stenlund H, Lundblad M, Dahlqvist SR. Inflammatory joint manifestations are prevalent in psoriasis: prevalence study of joint and axial involvement in psoriatic patients, and evaluation of a psoriatic and arthritic questionnaire. J Rheumatol 2002; 29: 2577-2582. Radtke MA, Reich K, Blome C, Rustenbach S, Augustin M. Prevalence and clinical features of psoriatic arthritis and joint complaints in 2009 patients with psoriasis: results of a German national survey. J Eur Acad Dermatol Venereol 2009; 23: 6836 Reich K, Krüger K, Mössner R, Augustin M.
- Epidemiology and clinical pattern of psoriatic arthritis in Germany:a prospective interdisciplinary epidemiol ogicalstudy of 1511 patients with plaquetype psoriasis. Br J Dermatol 2009; 160: 1040-1047.
- Christophers E, Barker J, Griffiths C, et al. The risk of psoriatic arthritis remains constant following initial diagnosis of psoriasis among patients seen in European dermatology clinics. J Eur Acad Dermatol Venereol. Published online 2009.
- Jajić Z, el Assadi G. Prevalence of psoriatic arthritis in a population of patients with psoriasis. Acta Med Croatica 2003; 57: 323-326.
- Jamshidi F, Bouzari N, Seirafi H, Farnaghi F, Firooz A. The prevalence of psoriatic arthritis in psoriatic patients in Tehran, Iran. Arch Iran Med 2008; 11: 162-1
- Kawada A, Tezuka T, Nakamizo Y, et al. A survey of psoriasis patients in Japan from 1982 to 2001. J Dermatol Sci 2003; 31: 59-64.
- Eder L, Chandran V, Shen H, et al. Incidence of arthritis in a prospective cohort of psoriasis patients. Arthritis Care Res (Hoboken) 2011; 63:619-622.
- Moll JM, Wright V. Familial occurrence of PsA. Ann Rheum Dis 1973; 32: 181-201.
- Elder JT, Nair RP, Henseler T, et al. The genetics of psoriasis 2001: the odyssey continues. Arch Dermatol 2001; 137: 1447-1454.
- Gladman DD, Rahman P. Psoriatic arthritis. In: Ruddy S, Harris ED, Sledge CB, Budd RC, Sergent JS, eds. Kelly’s Textbook of Rheumatology, 6th edn. Philadelphia: WB Saunders Co 2001: 1071-1079.
- Traupe H, van Gurp PJ, Happle R, Boezeman J, van de Kerkhof PC. Psoriasis vulgaris, fetal growth, and genomic imprinting. Am J Med Genet 1992; 42: 6496
- Rahman P, Gladman DD, Schentag C, Petronis A. Excessive paternal transmission in psoriatic arthritis. Arthritis Rheum 1999; 42: 1228–1231.
- Langlois S, Lopez-Rangel E, Hall JG. New mechanisms for genetic disease and non-traditional modes of inheritance. Adv Pediatr 1995; 42: 91-111.
- Karason A, Gudjonsson JE, Upmanyu R, et al. A susceptibility gene for psoriatic arthritis maps to chromosome 16p: evidence for imprinting. Am J Hum Genet 2003; 72: 125-131.
- Rahman P, Elder JT. Genetic epidemiology of psoriasis and psoriatic arthritis Ann Rheum Dis 2005; 64: 37-39.
- Rahman P, Gladman D, Khraishi M, et al. Influence of parental history on the recurrence risk of siblings with psoriatic arthritis .J Rheumatol 2003; 30: 1885.
- Gladman DD, Cheung C, Ng CM, Wade JA. HLA Clocus alleles in psoriatic arthritis. Human Immunol 1999; 60: 259-261.
- Al-Heresh AM, Proctor J, Jones SM, et al. Tumour necrosis factor-a polymorphisms and the HLACw*0602 allele in psoriatic arthritis. Rheumatology (Oxford) 2002; 41: 525-530.
- Gladman DD, Anhorn KAB, Schachter RK, Mervart H. HLA antigens in psoriatic arthritis. J Rheumatol 1986; 13: 586-592.
- Eastmond CJ. Genetics and HLA antigens. In: Wright V, Helliwell P, eds. In:Baillie`re’s Clinical Rheumatology. Psoriatic Arthritis London: Ballie`re Tindall 1994; 8: 263-276.
- Duffin KC, Chandran V, Gladman DD, et al. Genetics of psoriasis and psoriatic arthritis: update and future direction. J Rheumatol 2008; 35: 1449-1453.
- Cargill M, Schrodi SJ, Chang M, et al. A large-scale genetic association study confirms IL12B and leads to the identification of IL23R as psoriasis-risk genes. Am J Hum Genet 2007; 80: 273-290.
- Harrison BJ, Silman AJ, Barrett EM, et al. Presence of psoriasis does not influence the presentation or shortterm outcome of patients with early inflammatory polyarthritis. J Rheumatol 1997; 24: 1744-1749. Pattison E, Harrison BJ, Griffiths CE, Silman AJ, Bruce IN. Environmental risk factors for the development of psoriatic arthritis: results from a casecontrol study. Ann Rheum Dis 2008; 67: 672-676.
- Njobvu P, McGill P. Psoriatic arthritis and human immunodeficiency virus infection in Zambia. J Rheumatol 2000; 27: 1699-1702.
- Muto M, Date Y, Ichimiya M, et al. Significance of antibodies to streptococcal M protein in psoriatic arthritis and their association with HLA-A*0207. Tissue Antigens 1996; 48: 645-650.
- Yamamoto T, Katayama I, Nishioka K. Peripheral blood mononuclear cell proliferative response against staphylococcal superantigens in patients with psoriasis arthropathy. Eur J Dermatol 1999; 9: 17-21.
- Setty AR, Curhan G, Choi HK. Smoking and the risk of psoriasis in women: Nurses' Health Study II. Am J Med 2007; 120: 953-959.
- Rakkhit T, Wong B, Nelson TS, et al. Time to development of psoriatic arthritis decreases with smoking prior to psoriasis onset and increases with smoking after psoriasis onset. J Invest Dermatol 2007; 127:
Year 2014,
Volume: 19 Issue: 1, 1 - 7, 29.04.2014
Göknur Kalkan
,
Ayşe Serap Karadağ
References
- Mease P. Psoriatic arthritis update. Bull NYU Hosp Jt Dis 2006; 64: 25-31.
- Gladman DD, Antoni C, Mease P, et al. Psoriatic arthritis:epidemiology, clinical features, course, and outcome. Ann Rheum Dis 2005; 64: 14-17.
- Chandran V, Raychaudhuri SP. Geoepidemiology and environmental factors of psoriasis and psoriatic arthritis. J Autoimmun 2010; 34: 314-321.
- Ackermann C, Kavanaugh A. Economic burden of psoriatic arthritis. Pharmacoeconomics 2008; 26: 121– 1
- McHugh NJ, Balachrishnan C, Jones SM. Progression of peripheral joint disease in psoriatic arthritis: a 5-yr prospective study. Rheumatology (Oxford) 2003; 42: 778-7
- Bond SJ, Farewell VT, Schentag CT, Gladman DD. Predictors for radiological damage in psoriatic arthritis: results from a single centre. Ann Rheum Dis 2007; 66: 370–376.
- Kane D, Stafford L, Bresnihan B, FitzGerald O. A prospective, clinical and radiological study of early psoriatic arthritis: an early synovitis clinic experience. Rheumatology (Oxford) 2003; 42: 1460–1468.
- Kavanaugh AF, Ritchlin CT. Systematic review of treatments for psoriatic arthritis: an evidence based approach and basis for treatment guidelines. J Rheumatol 2006; 33: 1417-1421.
- Moll J, Wright V. Psoriatic arthritis. Semin Arthritis Rheum 1973; 3: 55-78.
- Helliwell P, Taylor W. Classification and diagnostic criteria for psoriatic arthritis. Ann Rheum Dis 2005; 64: 3Taylor W, Marchesoni A, Arreghini M, Sokol K, Helliwell P. A comparison of the performance characteristics of classification criteria for the diagnosis of psoriatic arthritis. Semin Arthritis Rheum 2004; 34: 575-584.
- Taylor W, Helliwell P, Gladman D, et al. A validation of current classification criteria for the diagnosis of psoriatic arthritispreliminary results of the CASPAR Study. Ann Rheum Dis 2005; 64: 107.
- Taylor W, Gladman D, Helliwell P, et al. Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum 2006; 54: 2665-2673.
- Chandran V, Schentag CT, Gladman DD. Sensitivity of the classification of psoriatic arthritis criteria in early psoriatic arthritis.Arthritis Rheum 2007; 57: 1560-1563.
- Alamanos Y, Voulgari PV, Drosos AA. Incidence and prevalence of psoriatic arthritis: a systematic review. J Rheumatol 2008; 35: 1354-1358.
- Scarpa R, Cosentini E, Manguso F, et al. Clinical and genetic aspects of psoriatic arthritis “sine psoriasis”. J Rheumatol 2003; 30: 2638-2640.
- Pedersen OB, Junker P. On the applicability of the CASPAR criteria in psoriatic arthritis. Ann Rheum Dis 2008; 67: 1495-1496.
- Pedersen OB, Svendsen AJ, Ejstrup L, Skytthe A, Junker P. The occurrence of psoriatic arthritis in Denmark. Ann Rheum Dis 2008; 67: 1422-1426.
- Hellgren L. Association between rheumatoid arthritis and psoriasis in total populations. Acta Rheumatol Scand. 1969; 15: 316-326. van Romunde LK, Valkenburg HA, Swart-Bruinsma W, Cats A, Hermans J. Psoriasis and arthritis. I. A population study. Rheumatol Int 1984; 4: 55-60.
- Saraux A, Guillemin F, Guggenbuhl P, et al. Prevalence of spondyloarthropathies in France: 2001. Ann Rheum Dis 2005; 64: 1431-1435.
- Alamanos Y, Papadopoulos NG, Voulgari PV, et al. Epidemiology of psoriatic arthritis in northwest Greece, 1982-2001. J Rheumatol 2003; 30: 264126
- Trontzas P, Andrianakos A, Miyakis S, et al. ESORDIG study group. Seronegative spondyloarthropathies in Greece: a population-based study of prevalence, clinical pattern, and management. The ESORDIG study. Clin Rheumatol 2005; 24: 5835
- Madland TM, Apalset EM, Johannessen AE, Rossebö B, Brun JG. Prevalence, disease manifestations, and treatment of psoriatic arthritis in Western Norway. J Rheumatol 2005; 32: 1918-1922.
- Love TJ, Gudbjornsson B, Gudjonsson JE, Valdimarsson H. Psoriatic arthritis in Reykjavik, Iceland: prevalence, demographics, and disease course. J Rheumatol 2007; 34: 2082-2088.
- De Angelis R, Salaffi F, Grassi W. Prevalence of spondyloarthropathies in an Italian population sample: a regional community-based study. Scand J Rheumatol 2007; 36: 14-21. Shbeeb M, Uramoto KM, Gibson LE, O'Fallon WM, Gabriel SE. The epidemiology of psoriatic arthritis in Olmsted County, Minnesota, USA, 198219 J Rheumatol 2000; 27: 1247-1250.
- Wilson FC, Icen M, Crowson CS, et al. Time trends in epidemiology and characteristics of psoriatic arthritis over 3 decades: a population-based study. J Rheumatol 2009; 36: 361-367. Gelfand JM, Gladman DD, Mease PJ, et al. Epidemiology of psoriatic arthritis in the population of the United States. J Am Acad Dermatol 2005; 53: 5 Hukuda S, Minami M, Saito T, et al. Spondyloarthropathies in Japan: nationwide questionnaire survey performed by the Japan Ankylosing Spondylitis Society. J Rheumatol 2001; 28: 554-559.
- Zeng QY, Chen R, Darmawan J, et al. Rheumatic diseases in China. Arthritis Res Ther 2008; 10: 17. Minaur N, Sawyers S, Parker J, Darmawan J. Rheumatic disease in an Australian Aboriginal community in North Queensland, Australia. A WHOILAR COPCORD survey. J Rheumatol 2004; 31: 9659
- Gladman DD. Clinical, radiological, and functional assessment in psoriatic arthritis: is it different from other inflammatory joint diseases? Ann Rheum Dis 2006; 65:22-24.
- Ibrahim G, Waxman R, Helliwell PS. The prevalence of psoriatic arthritis in people with psoriasis. Arthritis Rheum 2009; 61: 1373-1378.
- Wilson FC, Icen M, Crowson CS, et al. Incidence and clinical predictors of psoriatic arthritis in patients with psoriasis: a population-based study. Arthritis Rheum 2009; 61: 233-239. Gisondi P, Girolomoni G, Sampogna F, Tabolli S, Abeni D. Prevalence of psoriatic arthritis and joint complaints in a large population of Italian patients hospitalised for psoriasis. Eur J Dermatol 2005; 15: 279-2
- Scarpa R, Oriente P, Pucino A, et al. Psoriatic arthritis in psoriatic patients. Br J Rheumatol 1984; 23: 2462 Salvarani C, Lo Scocco G, Macchioni P, et al.
- Prevalence of psoriatic arthritis in Italian psoriatic patients. J Rheumatol 1995; 22: 1499-1503. Alenius GM, Stenberg B, Stenlund H, Lundblad M, Dahlqvist SR. Inflammatory joint manifestations are prevalent in psoriasis: prevalence study of joint and axial involvement in psoriatic patients, and evaluation of a psoriatic and arthritic questionnaire. J Rheumatol 2002; 29: 2577-2582. Radtke MA, Reich K, Blome C, Rustenbach S, Augustin M. Prevalence and clinical features of psoriatic arthritis and joint complaints in 2009 patients with psoriasis: results of a German national survey. J Eur Acad Dermatol Venereol 2009; 23: 6836 Reich K, Krüger K, Mössner R, Augustin M.
- Epidemiology and clinical pattern of psoriatic arthritis in Germany:a prospective interdisciplinary epidemiol ogicalstudy of 1511 patients with plaquetype psoriasis. Br J Dermatol 2009; 160: 1040-1047.
- Christophers E, Barker J, Griffiths C, et al. The risk of psoriatic arthritis remains constant following initial diagnosis of psoriasis among patients seen in European dermatology clinics. J Eur Acad Dermatol Venereol. Published online 2009.
- Jajić Z, el Assadi G. Prevalence of psoriatic arthritis in a population of patients with psoriasis. Acta Med Croatica 2003; 57: 323-326.
- Jamshidi F, Bouzari N, Seirafi H, Farnaghi F, Firooz A. The prevalence of psoriatic arthritis in psoriatic patients in Tehran, Iran. Arch Iran Med 2008; 11: 162-1
- Kawada A, Tezuka T, Nakamizo Y, et al. A survey of psoriasis patients in Japan from 1982 to 2001. J Dermatol Sci 2003; 31: 59-64.
- Eder L, Chandran V, Shen H, et al. Incidence of arthritis in a prospective cohort of psoriasis patients. Arthritis Care Res (Hoboken) 2011; 63:619-622.
- Moll JM, Wright V. Familial occurrence of PsA. Ann Rheum Dis 1973; 32: 181-201.
- Elder JT, Nair RP, Henseler T, et al. The genetics of psoriasis 2001: the odyssey continues. Arch Dermatol 2001; 137: 1447-1454.
- Gladman DD, Rahman P. Psoriatic arthritis. In: Ruddy S, Harris ED, Sledge CB, Budd RC, Sergent JS, eds. Kelly’s Textbook of Rheumatology, 6th edn. Philadelphia: WB Saunders Co 2001: 1071-1079.
- Traupe H, van Gurp PJ, Happle R, Boezeman J, van de Kerkhof PC. Psoriasis vulgaris, fetal growth, and genomic imprinting. Am J Med Genet 1992; 42: 6496
- Rahman P, Gladman DD, Schentag C, Petronis A. Excessive paternal transmission in psoriatic arthritis. Arthritis Rheum 1999; 42: 1228–1231.
- Langlois S, Lopez-Rangel E, Hall JG. New mechanisms for genetic disease and non-traditional modes of inheritance. Adv Pediatr 1995; 42: 91-111.
- Karason A, Gudjonsson JE, Upmanyu R, et al. A susceptibility gene for psoriatic arthritis maps to chromosome 16p: evidence for imprinting. Am J Hum Genet 2003; 72: 125-131.
- Rahman P, Elder JT. Genetic epidemiology of psoriasis and psoriatic arthritis Ann Rheum Dis 2005; 64: 37-39.
- Rahman P, Gladman D, Khraishi M, et al. Influence of parental history on the recurrence risk of siblings with psoriatic arthritis .J Rheumatol 2003; 30: 1885.
- Gladman DD, Cheung C, Ng CM, Wade JA. HLA Clocus alleles in psoriatic arthritis. Human Immunol 1999; 60: 259-261.
- Al-Heresh AM, Proctor J, Jones SM, et al. Tumour necrosis factor-a polymorphisms and the HLACw*0602 allele in psoriatic arthritis. Rheumatology (Oxford) 2002; 41: 525-530.
- Gladman DD, Anhorn KAB, Schachter RK, Mervart H. HLA antigens in psoriatic arthritis. J Rheumatol 1986; 13: 586-592.
- Eastmond CJ. Genetics and HLA antigens. In: Wright V, Helliwell P, eds. In:Baillie`re’s Clinical Rheumatology. Psoriatic Arthritis London: Ballie`re Tindall 1994; 8: 263-276.
- Duffin KC, Chandran V, Gladman DD, et al. Genetics of psoriasis and psoriatic arthritis: update and future direction. J Rheumatol 2008; 35: 1449-1453.
- Cargill M, Schrodi SJ, Chang M, et al. A large-scale genetic association study confirms IL12B and leads to the identification of IL23R as psoriasis-risk genes. Am J Hum Genet 2007; 80: 273-290.
- Harrison BJ, Silman AJ, Barrett EM, et al. Presence of psoriasis does not influence the presentation or shortterm outcome of patients with early inflammatory polyarthritis. J Rheumatol 1997; 24: 1744-1749. Pattison E, Harrison BJ, Griffiths CE, Silman AJ, Bruce IN. Environmental risk factors for the development of psoriatic arthritis: results from a casecontrol study. Ann Rheum Dis 2008; 67: 672-676.
- Njobvu P, McGill P. Psoriatic arthritis and human immunodeficiency virus infection in Zambia. J Rheumatol 2000; 27: 1699-1702.
- Muto M, Date Y, Ichimiya M, et al. Significance of antibodies to streptococcal M protein in psoriatic arthritis and their association with HLA-A*0207. Tissue Antigens 1996; 48: 645-650.
- Yamamoto T, Katayama I, Nishioka K. Peripheral blood mononuclear cell proliferative response against staphylococcal superantigens in patients with psoriasis arthropathy. Eur J Dermatol 1999; 9: 17-21.
- Setty AR, Curhan G, Choi HK. Smoking and the risk of psoriasis in women: Nurses' Health Study II. Am J Med 2007; 120: 953-959.
- Rakkhit T, Wong B, Nelson TS, et al. Time to development of psoriatic arthritis decreases with smoking prior to psoriasis onset and increases with smoking after psoriasis onset. J Invest Dermatol 2007; 127: