The Korean Journal of Internal Medicine Vol. 29, No. 5 (Suppl. 1) Rheumatology PS 1503 1 1 1 1 1 Ji-Hyoun KANG , Dong-Jin PARK , Jeong-Won LEE , Kyung-Eun LEE , Lihui WEN , TaeJong KIM1, Yong-Wook PARK1, Shin-Seok LEE1 Chonnam National University Hospital, Korea1 Background: We investigated the compliance of Korean patients using tumor necrosis factor (TNF) inhibitors to treat rheumatoid arthritis (RA) and ankylosing spondylitis (AS), and identiﬁed potential predictors associated with treatment discontinuation. Methods: The study population comprised 114 RA and 310 AS patients treated with TNF inhibitors at a single tertiary center for at least 1 year from December 2002 to November 2011. Results: Of the 114 RA patients, 64 (56.1%) discontinued their first TNF inhibitors with a mean duration of 18.1 months. By contrast, 65 of 310 patients (21.0%) with AS discontinued their ﬁrst TNF inhibitors, with a mean duration of 84 months. Although the survival rate did not differ among the three TNF inhibitors in the AS patients, the etanercept group had a lower discontinuation rate than the inﬂiximab group in the RA patients. In addition, RA patients who received corticosteroids in combination with TNF inhibitors were more likely to discontinue their TNF inhibitors. The independent predictors of drug discontinuation in AS patients were male gender and complete ankylosis on radiographs of the sacroiliac joint. Conclusions: Our results provide further evidence that real-life treatment outcomes of RA and AS patients may be different from those observed in randomized clinical trials. PS 1504 Rheumatology Retroperitoneal Fibrosis in- a Patient with Rheumatoid Arthritis Yu-Jeong OH1, Won-Seok LEE2, Wan-Hee YOO2 Department of Internal Medicine, Chonbuk National University Medical School, Korea1, Division of Rheumatology, Department of Internal Medicine, Chonbuk National University Medical School and Research Institute of Clinical Medicine of Chonbuk National University Hospital-Chonbuk Nation, Korea2 Introduction: Retroperitoneal ﬁbrosis (RPF) is a rare, chronic, and progressive disorder of unknown etiology that appears to be autoimmune in nature. RPF is characterized by chronic nonspeciﬁc inﬂammation of the retroperitoneum leading to entrapment and obstruction of the ureters and any organs proximate to the retroperitoneum. If unrecognized early, RPF leads to ureteral obstruction and renal failure. Case presentation: A 54-year-old man diagnosed with rheumatic arthritis (RA) at the age of 48 was treated with methotrexate and adalimumab. He presented with right lower back that had persisted for 1 month. Laboratory ﬁndings showed rheumatoid factor and anti-cyclic citrullinated protein antibody levels of 53.5 IU/mL and 73.76 IU/ mL, respectively. An erythrocyte sedimentation rate of 33 mm/h and C-reactive protein level of 10.25 mg/L were noted. An enhanced abdominal computed tomography scan showed abnormal tissue encasing the right common iliac artery that involved the right mid-ureter. The ureteral obstruction induced right kidney hydronephrosis. His symptoms were relieved after a right laparoscopic ureterolysis was performed, and the pathologic ﬁndings revealed mild inﬂammatory inﬁltration into the ﬁbrous tissue. The patient was eventually diagnosed with RPF. Conclusion: With increasing awareness of RPF, it can be identiﬁed in patients with RA to allow for early diagnosis and treatment. Therefore, clinicians should consider the possibility of RPF in patients with RA who are suffering from lower back pain, abdominal pain, or dysuria and order suitable imaging studies. PS 1506 Rheumatology Leukocyte-Speciﬁc Protein1 Regulates T Cell Migration and Inﬂammatory Arthritis Effect of Oral Prostacyclin Analogue on Serum TNF-Alpha Level in Patients with Rheumatoid Arthritis Yune-Jung Park1, Seong-Hye Hwang2, Seung-Hyun Jung3, Saseong Lee2, Susanna Choi2, Seung-Ah Yoo2, Ji-Hwan Park4, Daehee Hwang4, Seung Cheol Shim5, Chul-Soo Cho6, Yeun-Jun Chung3, Wan-Uk Kim2 Hye Won Kim1, Jin Wuk Hur1 The Catholic University of Korea, St. Vincent Hospital, Korea1, The Catholic University of Korea, St. Mary’s Hospital, Korea2, Integrated Research Center for Genome Polymorphism, Department of Microbiology, Korea3, School of Interdisciplinary Bioscience and Bioengineering, POSTECH, Korea4, Chungnam National University Hospital, Korea5, The Catholic University of Korea, Yeouido St. Mary’s Hospital, Korea6 Background: Prostacyclin that binds to prostacyclin receptor on platelets and vascular smooth muscle cells increase intracellular c-AMP and block inﬂux of calcium, resulting in antiplatelet and vasodilatory effect. As such, prostacyclin analogue is often attempted to patients who are accompanied by peripheral vasculopathy. TNF-alpha is a representative inﬂammatory marker in rheumatoid arthritis (RA), known to be integral target to treat. Assuming that prostacyclin may show anti-inﬂammatory effect, we aim to investigate serum TNF-alpha level before/after prostacyclin analogue treatment in patient with RA. Methods: Patients with RA suffering from symptom of vasculopathy (age > 20 years, diagnosed as RA at least 3 months earlier, on stable disease modifying anti-rheumatic drug therapy) were included. Participants were given 0.02mg three times a day of beraprost sodium, an oral prostacyclin analogue. CBC, ESR, CRP, serum TNF-alpha level were measured at baseline and 4, 12 weeks after treatment. Interviews on peripheral symptoms such as tingling sense, coldness of hand and Raynaud’s phenomenon were processed at baseline and 12 weeks after treatment. Results: Thirty-two patents were enrolled and 25 patients (male (n = 8), female (n = 17), mean disease duration 3.7 years) completed the study for 12 weeks. Most patients were on 3 or more DMARDs. Patients with ESR = 40mm/hr or with CRP = 2.0 mg/dL showed a declining tendency of serum TNF–alpha level at 4 weeks and at 12 weeks after prostacyclin analogue treatment, though it did not reached statistical signiﬁcance (p=0.367, p=0.227) probably due to lack of numbers of participants. Conclusions: TNF-alpha is an integral pro-inﬂammatory cytokine, against which targeted treatment for RA are ﬂourishing. We showed serum TNF-alpha level before and after treatment of prostacyclin analogue. Our results suggest anti-inﬂammatory effect of prostacyclin that may have a role in treatment of RA. Background: Copy number variations (CNVs) have been implicated in human diseases. However, it remains unclear how they affect immune dysfunction and autoimmune diseases, including rheumatoid arthritis (RA). Methods: To deﬁne CNVs, we used SNP genotyping data from the 500 discovery set. The Lsp1 plasmid DNA was tagged with GFP and was then transfected into Jurkat cells. Mice genetically deﬁcient in Lsp1 (Lsp1 –/– mice) were induced of delayed-type hypersensitivity and antigen-induced arthritis. Results: Here, we identiﬁed a novel Lsp1 deletion variant for RA susceptibility. Differentially expressed genes in Lsp1-deﬁcient primary T cells represent cell motility and immune and cytokine responses. Functional assays demonstrated that LSP1, induced by T cell receptor activation, negatively regulates T cell migration by hampering ERK activation in vitro. In mice with T cell-dependent chronic inﬂammation, loss of Lsp1 promotes migration of T cells into the target tissues as well as draining lymph nodes, exacerbating disease severity. Moreover, RA patients show diminished expression of LSP1 in peripheral T cells with increased migratory capacity. Conclusions: Our data highlights the importance of Lsp1 CNVs in the pathogenesis of immune diseases and provides novel insights into the mechanisms underlying T cell migration toward the inﬂamed synovium in RA. Seoul Eulji Hospital, Korea1 WCIM 2014 SEOUL KOREA 385 Poster Session Drug Survival Rates of Tumor Necrosis Factor Inhibitors in Patients with Rheumatoid Arthritis and Ankylosing Spondylitis Rheumatology PS 1505