Identification of susceptibility loci for Takayasu arteritis through a large multi-ancestral genome-wide association study.

Takayasu arteritis is a rare inflammatory disease of large arteries. We performed a genetic study in Takayasu arteritis comprising 6,670 individuals (1,226 affected individuals) from five different populations. We discovered HLA risk factors and four non-HLA susceptibility loci in VPS8, SVEP1, CFL2, and chr13q21 and reinforced IL12B, PTK2B, and chr21q22 as robust susceptibility loci shared across ancestries. Functional analysis proposed plausible underlying disease mechanisms and pinpointed ETS2 as a potential causal gene for chr21q22 association. We also identified >60 candidate loci with suggestive association (p < 5 × 10-5) and devised a genetic risk score for Takayasu arteritis. Takayasu arteritis was compared to hundreds of other traits, revealing the closest genetic relatedness to inflammatory bowel disease. Epigenetic patterns within risk loci suggest roles for monocytes and B cells in Takayasu arteritis. This work enhances understanding of the genetic basis and pathophysiology of Takayasu arteritis and provides clues for potential new therapeutic targets.

Anticoagulant Treatment May Decrease the Relapse Rate of Pulmonary Arterial Involvement in Behçet's Disease.

OBJECTIVES: Pulmonary arterial involvement (PAI) is one of the most common causes of mortality in Behçet's disease (BD). In this study, we aimed to evaluate the clinical features, course, and recurrence risk factors of BD-associated PAI. METHODS: BD patients who were followed up in Marmara University BD outpatient clinic between 1990 and 2023 were included. All data were acquired from the medical records of the patients. PAIs were classified according to the type of the vascular involvement as thrombosis or aneurysm. Factors affecting the risk of relapses were determined using multivariate Cox regression analysis. RESULTS: Among 1350 BD patients, 110 (8.1%) had PAI. The mean age (SD) of patients with PAI was 42.4 (11.6) years, and the male/female ratio was 2.2 (76/34). Thirty-two (29.1%) of 110 patients were asymptomatic. Asymptomatic patients with PAI were significantly younger (p = 0.031) than the symptomatic group. Also, a greater prevalence of females (p = 0.001) and higher recurrence rates (p = 0.019) were observed in the symptomatic group. Pulmonary arterial thrombosis was seen in 104 (94.5%) and aneurysms in 9 patients (6.6%). At least one PAI relapse was observed in 31 patients (28.2%). In multivariate analysis, the Cox regression model was significant (p = 0.013), and not starting anticoagulants independently increased the PAI relapse risk (hazards ratio, 4.36; 95% confidence interval, 1.14-24.1; p = 0.042). CONCLUSIONS: Pulmonary arterial thrombosis is the main presentation type of PAI in BD, whereas aneurysmatic formation is rare. Despite immunosuppressive treatment, relapses occur during follow-up in one third of patients with PAI. When anticoagulant therapy is added to immunosuppressive therapy, the relapse rate in BD patients with PAI is significantly reduced.

Cytokine Signature Differences in Major Phenotypic Groups of Behçet Disease.

OBJECTIVES: Behçet disease (BD) has heterogeneous presentations, mainly mucocutaneous, vascular, and ocular manifestations. The mechanisms associated with different phenotypes have not been clarified. We aimed to investigate the expression of innate and adaptive immunity-related cytokines in these 3 main BD phenotypes in active and untreated states and remission after treatment to be able to develop a cytokine-based treatment algorithm. METHODS: Serum samples were isolated from 41 patients with newly diagnosed active BD (aBD), which consisted of 19 mucocutaneous aBD, 11 ocular aBD (o-aBD), and 11 vascular aBD patients, 35 patients in remission (rBD), and 9 healthy controls (HC). Serum levels of each cytokine were measured with sandwich enzyme-linked immunosorbent assay and analyzed as both raw measurements and corrected levels for each 1 million white blood cells. RESULTS: The study included 41 aBD patients (female/male [F/M]: 9/32; median age, 29 years), 35 rBD patients (F/M: 9/26; median age, 29 years), and 9 HC (F/M: 3/6; median age, 28 years). The serum interferon γ level was significantly higher in the aBD group than in the rBD (116 vs. 92 pg/mL, p = 0.022). The serum interleukin 35 (IL-35) level was significantly higher in the HC group compared with aBD and rBD (p = 0.05). IL-17-related cytokines were lower in o-aBD. With treatment, they increased in o-aBD but decreased in mucocutaneous aBD and vascular aBD patients. CONCLUSION: This study supports the involvement of both innate and TH1-predominated adaptive immune responses across all BD phenotypes. The IL-17 and TH17-related immune responses appear less prominent in ocular BD, which may explain the ineffectiveness of IL-17 blockade in treating ocular BD. These findings support the need for further studies using comprehensive gene expression analyses to develop targeted treatment strategies for BD phenotypes.

Screening for familial disease presence in first-degree relatives of Behçet's disease patients: Is measurement of common femoral vein wall thickness valuable for the diagnosis?

OBJECTIVES: We aimed to assess first degree relatives (FDRs) of BD patients for the presence of clinical symptoms and signs of BD and evaluate common femoral vein (CFV) wall thickness measurement for the diagnosis. METHODS: Patients with BD(n=129) and FDRs(n=230) of these patients were included. FDRs were questioned in terms of BD symptoms by phone. Pathergy test and CFV wall thickness measurement were performed among 111 FDRs who accepted the clinical assessment. Clinical assessment group were classified according to the criteria sets for BD. FDRs who did not meet the criteria sets and had at least one clinical finding in addition to oral aphthae(OA) were categorized as the "suspected BD". RESULTS: :We observed increased frequency of isolated BD manifestations in FDRs. Ten FDRs were diagnosed with BD during clinical evaluation. Significantly increased CFV wall thickness was observed in FDRs of BD patients fulfilling diagnostic BD criteria (p<0.001 for both sides) and also in those with suspected BD group (p<0.05 for both sides). Presence of OA, genital ulcer, folliculitis or erythema nodosum were associated with increased CFV wall thickness (p<0.05). CONCLUSION: . Our results suggest that CFV wall thickness measurement can be used in diagnosis of familial BD.

Intima-media thickness of common femoral vein is increased in Behçet's disease.

The histopathological data about vascular inflammation in Behçet's disease(BD) mainly comprises patients with arterial involvement. Inflammatory cell infiltration was mainly observed around the vasa vasorum and adventitial layer of the aneurysmatic vessels, and only a few cells were seen in the intimal layer during active arteritis. There is limited data for the histopathology of venous inflammation. We recently showed that increased common femoral vein(CFV) wall thickness is a specific sign of vein wall inflammation in BD. We aimed to investigate the different vein subsections measuring the whole wall and the intima-media thickness(IMT) of CFV with ultrasonography in BD. We found increased IMT of CFV compared to controls as well as CFV wall thickness. This study shows that there is a full layer venous wall inflammation in BD independent of vascular involvement. Our results suggest that venous endothelial inflammation may trigger the thickening of the vein wall and cause thrombotic tendency in BD.

Earlier and more aggressive treatment with biologics may prevent relapses and further new organ involvement in Behçet's disease.

OBJECTIVE: Immunosuppressives (IS) are the choice of treatment for major organ involvement in Behçet's disease (BD). In this study, we aimed to investigate the relapse rate and new major organ development in BD under ISs during long-term follow-up. METHODS: The files of 1114 BD patients followed in Marmara University Behçet's Clinic were analyzed retrospectively. Patients with a follow-up less than 6 months were excluded. Conventional IS and biologic treatment courses were compared. 'Events under IS' were defined as a relapse of the same organ and/or new major organ development in patients receiving ISs. RESULTS: Among 806 patients included in the final analysis (male: 56%, age at diagnosis: 29 (23-35) years, median follow-up time: 68 (33-106) months). Major organ involvement was present in 232 (50.5%) patients at diagnosis, and 227 (49.5%) developed new major organ involvement during follow-up. Major organ involvement developed earlier in males (p = 0.012) and in patients with a first-degree relative history of BD (p = 0.066). ISs were given mostly for major organ involvement (86.8%, n = 440). Overall, 36% of the patients had a relapse or new major organ involvement under ISs (relapse: 30.9%, new major organ involvement: 11.6%.) 'Events under IS' (35.5% vs 20.8%, p = 0.004), and relapses (29.3% vs 13.9%, p = 0.001) were more common with conventional ISs compared to biologics. CONCLUSION: Any major event under ISs was less common with biologics compared to conventional ISs in patients with BD. These results suggest that earlier and more aggressive treatment may be an option in BD patients who had the highest risk for severe disease course.

Clinical trait-specific genetic analysis in Behçet's disease identifies novel loci associated with ocular and neurological involvement.

Behçet's disease is a complex inflammatory vasculitis with a broad spectrum of clinical manifestations. The purpose of this study was to investigate the genetics underlying specific clinical features of Behçet's disease. A total of 436 patients with Behçet's disease from Turkey were studied. Genotyping was performed using the Infinium ImmunoArray-24 BeadChip. After imputation and quality control measures, logistic regressions adjusting for sex and the first five principal components were performed for each clinical trait using a case-case genetic analysis approach. A weighted genetic risk score was calculated for each clinical feature. Genetic association analyses of previously identified susceptibility loci in Behçet's disease revealed a genetic association between ocular lesions and HLA-B/MICA (rs116799036: OR = 1.85 [95% CI = 1.35-2.52], p-value = 1.1 × 10-4). The genetic risk score was significantly higher in Behçet's disease patients with ocular lesions compared to those without ocular involvement, which is explained by the genetic variation in the HLA region. New genetic loci predisposing to specific clinical features in Behçet's disease were suggested when genome-wide variants were evaluated. The most significant associations were observed in ocular involvement with SLCO4A1 (rs6062789: OR = 0.41 [95% CI = 0.30-0.58], p-value = 1.92 × 10-7), and neurological involvement with DDX60L (rs62334264: OR = 4.12 [95% CI 2.34 to 7.24], p-value = 8.85 × 10-7). Our results emphasize the role of genetic factors in predisposing to specific clinical manifestations in Behçet's disease, and might shed additional light into disease heterogeneity, pathogenesis, and variability of Behçet's disease presentation across populations.

Pulmonary arterial wall thickness increased in Behçet's disease patients with major organ involvement: Is it a sign of severity?

OBJECTIVES: Behçet's disease (BD) is a unique systemic vasculitis mainly involving veins, in contrast to other vasculitides. Prior studies have shown that pulmonary arteries (PAs) have a similar structure to systemic veins. In this study we aimed to assess PA wall thickness by transthoracic echocardiography (TTE) in BD patients compared with healthy controls (HCs) and patients with non-inflammatory pulmonary embolism (NIPE). METHODS: Patients with BD (n = 77) and NIPE (n = 33) and HCs (n = 57) were studied. PA wall thickness was measured from the mid-portion of the main PA with TTE by two cardiologists blinded to cases. RESULTS: PA wall thickness was significantly lower in HCs [3.6 mm (s.d. 0.3)] compared with NIPE [4.4 mm (s.d. 0.5)] and BD [4.4 mm (s.d. 0.6)] (P < 0.001 for both). PA wall thickness was similar between BD and NIPE (P = 0.6). Among patients with BD, PA wall thickness was significantly higher in patients with major organ involvement compared with mucocutaneous limited disease [4.7 mm (s.d. 0.4) vs 3.7 (0.4), P < 0.001], HCs and NIPE (P < 0.001 and P = 0.006, respectively). PA wall thickness was comparable between patients with vascular and non-vascular major organ involvement [4.6 mm (s.d. 0.5) vs 4.7 (0.3), P = 0.3]. CONCLUSION: We observed that PA wall thickness was significantly higher in BD with major organ involvement compared with patients with only mucocutaneous limited disease, HCs and NIPE. These results suggest that increased PA wall thickness may be a sign of severe disease with major organ involvement in BD.

Does decision tree analysis predict oral ulcer activity-related factors in patients with Behçet's syndrome?

OBJECTIVES: The study aimed to identify the interactions among treatment protocols and oral ulcer activity related factors in patients with Behçet's syndrome (BS) using the Classification and Regression Tree (CART) algorithm. METHODS: In this cross-sectional study, 979 patients with BS were included from16 centres in Turkey, Jordan, Brazil and the United Kingdom. In the CART algorithm, activities of oral ulcer (active vs. inactive), genital ulcer (active vs. inactive), cutaneous involvement (active vs. inactive), musculoskeletal involvement (active vs. inactive), gender (male vs. female), disease severity (mucocutaneous and musculoskeletal involvement vs. major organ involvement), smoking habits (current smoker vs. non-smoker), tooth brushing habits (irregular vs. regular), were input variables. The treatment protocols regarding immunosuppressive (IS) or non-IS medications were the target variable used to split from parent nodes to purer child nodes in the study. RESULTS: In mucocutaneous and musculoskeletal involvement (n=538), the ratio of IS use was higher in patients with irregular toothbrushing (ITB) habits (27.1%) than in patients with regular toothbrushing (RTB) habits (14.2%) in oral ulcer activity. In major organ involvement (n=441), male patients with ITB habits were more likely treated with IS medications compared to those with RTB habits (91.6% vs. 77.6%, respectively). CONCLUSIONS: Male BS patients on IS who have major organ involvement and oral ulcer activity with mucocutaneous and musculoskeletal involvement have irregular toothbrushing habits. Improved oral hygiene practices should be considered to be an integral part for implementing patient empowerment strategies for BS.

Low relapse rate in patients with giant cell arteritis in a multi-centre retrospective Turkish Registry.

OBJECTIVES: Glucocorticoids (GC) are widely accepted as the standard first-line treatment for giant cell arteritis (GCA). However, relapse rates are reported up to 80% on GC-only protocol arms in controlled trials of tocilizumab and abatacept in 12-24 months. Herein, we aimed to assess the real-life relapse rates retrospectively in patients with GCA from Turkey. METHODS: We assembled a retrospective cohort of patients with GCA diagnosed according to ACR 1990 criteria from tertiary rheumatology centres in Turkey. All clinical data were abstracted from medical records. Relapse was defined as any new manifestation or increased acutephase response leading to the change of the GC dose or use of a new therapeutic agent by the treating physician. RESULTS: The study included 330 (F/M: 196/134) patients with GCA. The mean age at disease onset was 68.9±9 years. The most frequent symptom was headache. Polymyalgia rheumatica was also present in 81 (24.5%) patients. Elevation of acute phase reactants (ESR>50 mm/h or CRP>5 mg/l) was absent in 25 (7.6%) patients at diagnosis. Temporal artery biopsy was available in 241 (73%) patients, and 180 of them had positive histopathological findings for GCA. For remission induction, GC pulses (250-1000 methylprednisolone mg/3-7 days) were given to 69 (20.9%) patients, with further 0.5-1 mg/kg/day prednisolone continued in the whole group. Immunosuppressives as GC-sparing agents were used in 252 (76.4%) patients. During a follow-up of a median 26.5 (6-190) months, relapses occurred in 49 (18.8%) patients. No confounding factor was observed in relapse rates. GC treatment could be stopped in only 62 (23.8%) patients. Additionally, GC-related side effects developed in 64 (24.6%) patients, and 141 (66.2%) had at least one Vasculitis Damage Index (VDI) damage item present during follow-up. CONCLUSIONS: In this first multi-centre series of GCA from Turkey, we observed that only one-fifth of patients had relapses during a mean follow-up of 26 months, with 76.4% given a GC-sparing IS agent at diagnosis. At the end of follow-up, GC-related side effects developed in one-fourth of patients. Our results suggest that patients with GCA had a low relapse rate in real-life experience of a multi-centre retrospective Turkish registry, however with a significant presence of GC-associated side effects during follow-up.

Sex-specific analysis in Behçet's disease reveals higher genetic risk in male patients.

OBJECTIVES: Behçet's disease tends to be more severe in men than women. This study was undertaken to investigate sex-specific genetic effects in Behçet's disease. METHODS: A total of 1762 male and 1216 female patients with Behçet's disease from six diverse populations were studied, with the majority of patients of Turkish origin. Genotyping was performed using an Infinium ImmunoArray-24 BeadChip, or extracted from available genotyping data. Following imputation and extensive quality control measures, genome-wide association analysis was performed comparing male to female patients in the Turkish cohort, followed by a meta-analysis of significant results in all six populations. In addition, a weighted genetic risk score for Behçet's disease was calculated and compared between male and female patients. RESULTS: Genetic association analysis comparing male to female patients with Behçet's disease from Turkey revealed an association with male sex in HLA-B/MICA within the HLA region with a GWAS level of significance (rs2848712, OR = 1.46, P = 1.22 × 10-8). Meta-analysis of the effect in rs2848712 across six populations confirmed these results. Genetic risk score for Behçet's disease was significantly higher in male compared to female patients from Turkey. Higher genetic risk for Behçet's disease was observed in male patients in HLA-B/MICA (rs116799036, OR = 1.45, P = 1.95 × 10-8), HLA-C (rs12525170, OR = 1.46, P = 5.66 × 10-7), and KLRC4 (rs2617170, OR = 1.20, P = 0.019). In contrast, IFNGR1 (rs4896243, OR = 0.86, P = 0.011) was shown to confer higher genetic risk in female patients. CONCLUSIONS: Male patients with Behçet's disease are characterized by higher genetic risk compared to female patients. This genetic difference, primarily derived from our Turkish cohort, is largely explained by risk within the HLA region. These data suggest that genetic factors might contribute to differences in disease presentation between men and women with Behçet's disease.

The assessment of presenteeism and activity impairment in Behçet's syndrome and recurrent aphthous stomatitis: a multicentre study.

OBJECTIVE: To evaluate key factors for presenteeism and activity impairment in multinational patients with Behçet's syndrome (BS) and recurrent aphthous stomatitis (RAS). METHODS: In this cross-sectional study, 364 BS patients from Jordan, Brazil, the United Kingdom and Turkey and 143 RAS patients from the United Kingdom and Turkey were included. The Work Productivity Activity Impairment (WPAI) scale was used for presenteeism and activity impairment. Mediation analyses were performed to evaluate both direct and indirect causal effects. RESULTS: Presenteeism score was higher in active patients with genital ulcers and eye involvement as well as patients with comorbidities and current smokers than the others in BS (P < 0.05). In RAS, presenteeism score was elevated by oral ulcer activity in the direct path (P = 0.0073) and long disease duration as a mediator in the indirect path (P = 0.0191). Patients with active joint involvement had poor scores in absenteeism, presenteeism, overall impairment and activity impairment compared with those of inactive patients (P < 0.05). Using mediation analysis, the activity impairment score was directly mediated by joint activity (P = 0.0001) and indirectly mediated through oral ulcer-related pain in BS (P = 0.0309). CONCLUSION: In BS, presenteeism was associated with disease activity, presence of comorbidities and being a current smoker, whereas in RAS, presenteeism was associated with oral ulcer activity and increased length of the disease. Moreover, activity impairment was adversely affected by joint activity and oral ulcer related pain in BS. Patients need to be empowered by using appropriate treatment strategies in their working environment and daily life.

Fibroscan detection of fatty liver and liver fibrosis in patients with systemic lupus erythematosus.

OBJECTIVE: Although liver dysfunction is not considered the main organ involvement in Systemic Lupus Erythematosus (SLE), the frequency of liver dysfunction or abnormal liver enzyme values may be observed in 50-60% of patients. The aim of this study was to assess fatty liver and liver fibrosis in SLE patients using Fibroscan as well as determine associated factors such as immunosuppressive medications. METHODS: Sixty SLE patients and 30 healthy controls were included. Patients with HBV, HCV or cirrhosis, malignancy, cardiac disease, or patients on dialysis were excluded. All participants underwent Fibroscan measurements. RESULTS: The prevalence of fatty liver disease was similar between SLE patients and healthy controls (21.7 vs 26.7%, p = .597). Liver fibrosis was also similar between the two groups (26.7 vs 10.0%, p = .069). Since the majority of SLE patients were female, we performed a subgroup analysis in female patients (n = 51) and controls (n = 25). Fatty liver disease was similar between female SLE patients and controls (23.5 vs 24.0%, p = .964). However, liver fibrosis in female patients with SLE was increased compared to female controls (29.4 vs 4.0%, p = .011) and was associated with age (Exp (B) 95% CI: 1.083 (1.006-1.166), p = .034) and low-dose cumulative glucocorticoid use (Exp (B) 95% CI: 14.116 (1.213-164.210), p = .034). CONCLUSION: The prevalence of fatty liver was similar between SLE patients and controls, while liver fibrosis was increased in the female patient group as compared to controls. Furthermore, liver fibrosis was associated with age and low dose cumulative glucocorticoid use. Interestingly, fatty liver did not precede liver fibrosis in the majority of cases, contrary to what is observed in the general population. Larger studies are needed to confirm our findings and determine whether immunosuppressive use has any impact on the development of liver fibrosis in SLE patients.

Vascular Behçet's disease: a comparative study from Turkey and France.

OBJECTIVES: Vascular Behçet's disease (VBD) is a systemic vasculitis involving both arterial and venous vessels of all sizes and occurring in up to 40% of patients with BD. VBD is the main cause of mortality in BD. Although commonly seen around the Mediterranean region, comparative studies in VBD are lacking. We aimed to compare the course and therapeutic approaches of VBD in two large cohorts from Turkey and France. METHODS: We included 291 VBD patients (female/male:63/228, mean age: 41.2±11.3 years) who were followed up in the Department of Internal Medicine and Clinical Immunology at Pitié-Salpêtrière Hospital, Sorbonne University, Paris, France (n=131) and Rheumatology Division of Marmara University School of Medicine, Istanbul, Turkey (n=160). All clinical and demographical data were acquired from patient charts retrospectively. RESULTS: Smoking, family history for BD, HLA-B*51 presence and pathergy positivity were significantly higher in Turkish patients (TR), while neurologic involvement was more prominent in the French (FR) group. After a median follow-up of 77 months, 562 vascular events occurred including 440 venous events, 115 arterial events and 7 cardiac thrombi. In 79 (29%) patients, first vascular event developed before BD diagnosis and for 77 (28%) of them, vascular involvement was the presenting sign of the disease. First relapse developed in 130 (44.7%) patients after median 24.5 (1-276) months of follow-up (TR: 46.3% (n=74), FR: 42.7% (n=56), p=0.56). Survival graph revealed that FR cohort has 1.64 times increased recurrent event risk compared to TR cohort (HR=1.64 (1.1-2.44), p=.014) and although did not reach to statistical significance, IS treatment after the first vascular event decreased further vascular events (HR= 0.66 (0.43-1.01, p=.057). CONCLUSIONS: Almost half of patients relapsed of VBD within 2 years after the first vascular event. Immunosuppressants decrease VBD relapses.

Femoral vein wall thickness measurement: A new diagnostic tool for Behçet's disease.

OBJECTIVES: Diagnosing Behçet's disease (BD) is a challenge, especially in countries with a low prevalence. Recently, venous wall thickness (VWT) in lower extremities has been shown to be increased in BD patients. In this study, we aimed to investigate the diagnostic performance of common femoral vein (CFV) thickness measurement in BD and whether it can be used as a diagnostic tool. METHODS: . Patients with BD (n = 152), ankylosing spondylitis (n = 27), systemic vasculitides (n = 23), venous insufficiency (n = 29), antiphospholipid syndrome (APS; n = 43), deep vein thrombosis due to non-inflammatory causes (n = 25) and healthy controls (n = 51) were included in the study. Bilateral CFV thickness was measured with ultrasonography by a radiologist blinded to cases. RESULTS: Bilateral CFV thickness was significantly increased in BD compared with all control groups (P < 0.001 for all). The area under the receiver operating characteristic curve for bilateral CFV thicknesses in all comparator groups was >0.95 for the cut-off value (0.5 mm). This cut-off value also performed well against all control groups with sensitivity rates >90%. The specificity rate was also >80% in all comparator groups except APS (positive predictive value: 79.2-76.5%, negative predictive value: 92-91.8% for right and left CFV, respectively). CONCLUSION: Increased CFV thickness is a distinctive feature of BD and is rarely present in healthy and diseased controls, except APS. Our results suggest that CFV thickness measurement with ultrasonography, a non-invasive radiological modality, can be a diagnostic tool for BD with sensitivity and the specificity rates higher than 80% for the cut-off value ≥0.5 mm.

Advances in the Treatment of Behcet's Disease.

PURPOSE OF REVIEW: To assess current management of Behcet's disease (BD). Controversies on therapeutic approaches to different manifestations, whether conventional immunosuppressives (IS) or biologic agents, should be chosen, and options for refractory disease are discussed. RECENT FINDINGS: Glucocorticoids are still the main agents for remission-induction and azathioprine the first-line conventional IS in maintenance phase to prevent relapses of major organ involvement. Apremilast is shown to be a safe and effective option approved by the FDA for oral ulcers. Large case series confirmed the efficacy and safety of TNFα inhibitors and Interferon-α. Promising results are observed with IL-1 inhibitors, ustekinumab, secukinumab, and tocilizumab for refractory BD. Although both conventional IS and biologic agents are effectively used to suppress inflammation in BD, there is still an unmet need for clear therapeutic strategies in the management for different manifestations. Further controlled studies with new biologic agents, anticoagulants and the benefit of concomitant IS usage with biologics are needed to optimize the management of BD.

Femoral Vein Wall Thickness Measurement May Be a Distinctive Diagnostic Tool to Differentiate Behçet's Disease with Intestinal Involvement and Crohn's Disease.

BACKGROUNDS: Behçet's disease (BD) and Crohn's disease (CD) cannot be easily differentiated in young adults presenting with nonspecific gastrointestinal (GI) manifestations due to similar extraintestinal manifestations. We recently showed that increased common femoral vein (CFV) thickness is a distinctive feature of BD, rarely present in other inflammatory or vascular diseases with a specificity higher than 80% for the cutoff value of ≥ 0.5 mm. We suggest that CFV thickness measurement with ultrasonography (US) can be a diagnostic tool for BD. AIMS: To assess the diagnostic performance of CFV thickness measurement in the differential diagnosis of BD and CD. METHODS: Patients with BD (n = 69), CD (n = 38), and healthy controls (HC) (n = 38) were included in the study. Bilateral CFV thickness was measured with Doppler US. RESULTS: Both right and left CFV thicknesses were significantly higher in BD compared to HC and CD (for right: 0.76 mm vs 0.33 mm, for left: 0.78 mm vs 0.35 mm, p < 0.001 for both). CFV thicknesses in CD were similar to HC (p > 0.05 for both). CFV thickness was also similar between BD patients with and without GI involvement (p = 0.367). The diagnostic cutoff values of ≥ 0.5 mm for CFV thickness performed well against to both CD and HCs for discrimination of BD. The sensitivity and specificity rates were > 85% for both HC and CD. Positive and negative predictive values in our tertiary clinical setting were > 90%. CONCLUSION: We found significantly lower CFV thickness in CD compared to BD. Our results suggest that CFV wall thickness measurement is a distinctive diagnostic tool for the differentiation of BD and CD and can be helpful in daily practice for the differentiation of two diseases.

Risk of tuberculosis is increased in Behçet's disease compared to other rheumatological disorders after anti-TNFα treatments: a case series and review of the literature

Background/aim: Tumor necrosis factor-alfa (TNF-a) antagonists are extensively utilized in the treatment of inflammatory rheumatic diseases and also shown to be effective in Behçet's disease (BD) patients with major organ involvement. In this study, we aimed to re- evaluate the incidence of tuberculosis (TB) infection after anti-TNFa treatments and to reveal the risk of TB in BD. Methods: Data of patients who received anti-TNFa treatment between 2005 and 2018 were assessed retrospectively. Demographic features, TNF-a antagonist type/treatment time, tuberculosis skin test (TST) and QuantiFERON results, isoniazid prophylaxis status, and concomitant corticosteroid (CS) treatments were collected. Results: A total of 1277 (male/female = 597/680; median age = 49 years) patients were treated with TNF-a antagonist for a median of 33 months (Q1:12, Q3:62). Thirteen (1%) patients developed TB during the follow-up period. Within 13 TB-positive patients, 7 of them had pulmonary, and 7 had extrapulmonary TB. Although, the median time of (month) TNF-a antagonist treatment was higher in TB-positive patients than negative ones, the difference was not statistically significant (48 and 33 months, respectively, p = 0.47). Similarly, TB-positive patients were treated with CSs more than TB-negative patients (80% vs. 60%). Time from the initiation of TNF-a antagonist treatment to the diagnosis of TB had a median of 40 months (Q1-Q3: 22-56). There was a statistically significant increase of TB development in BD patients than non-BD patients after TNF-a antagonists (7.5% vs. 0.8%, respectively, p = 0.007). When we combined our patients with the other series from Turkey, among 12928 patients who received TNF-a antagonists, TB was positive in 12 (3.9%) of 305 BD patients compared to 112 (0.9%) of 12623 non-BD patients (p < 0.00001). Conclusion: Our results suggest a higher frequency of TB infections in BD patients with TNF-a antagonists. As biologic agents are increasingly used for major organ involvement in current practice for BD, screening mechanisms should be carefully implemented.

Damage assessment in adult IgA vasculitis. Cross-sectional results of a multicentre cohort.

OBJECTIVES: Immunoglobulin (Ig) A vasculitis affects children more commonly than adults and previous literature lacks any formal damage assessment. Our aim in this study is to investigate the disease course, relapse rates and prognostic factors in adult patients with IgA vasculitis and to evaluate the disease-related damage. METHODS: We assembled a retrospective cohort of adult IgA vasculitis from six tertiary Rheumatology Centres in Turkey. The demographics, clinical characteristics, treatment and outcomes of patients were abstracted from medical records. RESULTS: The study included 130 (male/female: 85/45) patients and the mean age was 42.2±17 years. Cutaneous manifestations and arthritis/arthralgia were the most common clinical manifestations. One hundred thirteen patients (86.9%) were treated with oral glucocorticoids (GC). As additional immunosuppressive (IS) agents, azathioprine was given to 44 (34.9%) and pulse cyclophosphamide to 18 (12.6%) patients. Seventy-nine patients (60%) had follow-up of median 15 (IQR 7-40) months. Twelve (15%) patients relapsed during follow-up. The mean VDI score was 0.4 in the last visit. Nineteen (24.7%) patients had at least one damage item at the end of follow-up. Most frequent damage items were renal 11 (42%), ocular 4 (15%) and cardiovascular 4 (15%). CONCLUSIONS: In this cohort the most frequent damage item was renal and was related to the disease itself. Damage score was higher in patients with more severe disease and treated more aggressively. Our results suggest that more effective treatment options are needed in a subgroup of patients with IgA vasculitis to prevent the damage related with the vasculitis, especially with more severe disease.

Decreasing incidence and severity of Behçet's disease: a changing trend in epidemiological spectrum possibly associated with oral health

Behçet's disease (BD) is a systemic and inflammatory disorder that is mainly present along the ancient Silk Road, from the Mediterranean Sea to East Asia. A wide range of prevalence figures (0.1­420/100,000) have been reported for BD, also among Turkish populations of similar genetic background living in different countries. Recently, a decline in the incidence of BD and a change of the disease spectrum to less-severe manifestations have been reported from Japan and Korea, two genetically homogenous, affluent populations with limited immigration. It was hypothesized that a decline in infectious diseases, especially dental/periodontal infections, associated with the improvement in oral health, could be a part of these changes in the disease expression. Further epidemiological studies in other populations might demonstrate whether there is a worldwide similar trend and may provide a better understanding of the triggering factors for the onset and course of BD.