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Abstract

Background:

Anti-tumor necrosis factor (TNF) agents are increasingly used for rheumatic diseases and inflammatory bowel disease (IBD), but are associated with the development of anti-TNF-induced lupus (ATIL). Nonetheless, few ATIL studies on non-Caucasian IBD patients exist. Here, we investigated the incidence, clinical features, and risk factors of ATIL in Korea.

Methods:

We retrospectively reviewed the medical records of IBD patients undergoing anti-TNF therapy at our tertiary IBD center between 2008 and 2020. ATIL was diagnosed as a temporal association between symptoms and anti-TNF agents, and the presence of at least one serologic and non-serologic American College of Rheumatology criterion. The risk factors for ATIL occurrence were assessed using multivariate Cox regression analysis.

Results:

Of 1362 IBD patients treated with anti-TNF agents, 50 (3.7%) ATIL cases were suspected, of which 14 (1.0%) received a definitive diagnosis. Arthritis and mucocutaneous symptoms were observed in 13 and 4 patients, respectively. All ATIL cases were positive for anti-nuclear and anti-dsDNA antibodies. Four patients (30.8%) improved while continuing anti-TNF therapy. At the final follow up, the ATIL group (n = 14) had a lower IBD remission rate (30.8% versus 68.8%, p = 0.019) than the non-ATIL group (n = 36). Ulcerative colitis and longer disease duration were associated with ATIL occurrence, with hazard ratios of 7.017 (p = 0.005) and 1.118 (p = 0.002), respectively.

Conclusion:

Although rare, ATIL is associated with poor treatment response to IBD in Korean patients. ATIL should be considered if arthritis and mucocutaneous symptoms develop during anti-TNF therapy for IBD.

Keywords

anti-TNF agent drug-induced lupus inflammatory bowel disease

Introduction

Inflammatory bowel disease (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), is a chronic inflammatory disorder of the gastrointestinal tract. IBD has a multifactorial pathogenesis, which has led to attempts to develop a variety of biological agents. Anti-tumor necrosis factor (TNF) agents target TNF-alpha, which is associated with the pathogenesis of various autoimmune diseases, and are effective and widely used for the treatment of IBD.¹ These agents are generally tolerated in patients, but there are concerns about adverse events such as infection and malignancy.² Further, autoimmune-mediated phenomena have been identified during anti-TNF treatments.³

Anti-TNF agents induce the production of autoantibodies in some patients, including anti-nuclear antibody (ANA) and anti-dsDNA antibody (anti-dsDNA).⁴ Some of these cases may develop anti-TNF-induced lupus (ATIL), which is a rare autoimmune disease characterized by clinical and immunological findings similar to systemic lupus erythematosus (SLE). The main clinical and serological features of ATIL include skin rash, arthralgia, serositis, fever and anti-dsDNA positivity, which are somewhat different from the characteristics of other drug-induced lupus.^5,6 These features of ATIL have a temporal association with anti-TNF agent exposure, and usually resolve after discontinuation of the anti-TNF agents. The pathogenesis of ATIL remains unknown, but is possibly related to an imbalance between interferon-alpha and TNF-alpha, an increase in apoptotic particles, a cytokine shift to a Th2 response, and a predisposition to bacterial infection.⁷ As the use of anti-TNF agents increases, a greater interest in ATIL is also emerging. Notably however, few studies to date have reported on the characteristics of ATIL in IBD patients. In our present study, we aimed to evaluate the incidence, risk factors, and clinical features of ATIL in a single IBD cohort treated with anti-TNF agents.

Methods

Study population

This study was conducted on adult IBD patients who received treatment with anti-TNF agents at a tertiary referral center in South Korea between March 2008 and February 2020. ATIL was diagnosed if the following criteria were met: (1) a temporal association was found between symptoms and anti-TNF agents; (2) at least one serologic American College of Rheumatology (ACR) criterion was noted; and (3) at least one non-serologic ACR criterion was satisfied.⁸

IBD patients who were referred to our rheumatology clinic due to a suspicion of rheumatic disease, and for whom ANA and anti-dsDNA data were available, were analyzed to compare the clinical characteristics of ATIL and non-ATIL cases. We retrospectively reviewed the electronic medical records of these patients, including age, gender, IBD type, disease duration prior to anti-TNF treatment, type of anti-TNF agent used, concomitant medications used, and autoantibody profile. The IBD activity level at baseline and at the final follow-up date was based on Crohn’s disease activity index (CDAI) for CD,⁹ and the partial Mayo score for UC.¹⁰ Patients with an ileostomy/colostomy were excluded when evaluating the IBD activity score. Clinical remission from IBD was defined as a CDAI <150 points in CD cases and partial Mayo score <2 points in UC patients.^1,11 The final follow-up date was defined as the time of ATIL diagnosis in the ATIL group and as the time of the last anti-TNF agent use in the non-ATIL group, possibly resulting in a shorter duration of anti-TNF treatment in the ATIL group. Clinical features and outcomes among the ATIL cases were also evaluated.

This study was conducted in accordance with the Declaration of Helsinki principles and was approved by the Institutional Review Board of Asan Medical Center (IRB number: 2019-0700). Informed consent was waived because of the retrospective nature of the study.

Statistical analysis

Variables were represented as medians with an interquartile range (IQR) for continuous variables and as numbers (%) for categorical variables. The Mann–Whitney U test was used to assess the differences among continuous variables. Categorical variables were compared using the Chi-square test or Fisher’s exact test. Univariate and multivariate Cox proportional hazard models were conducted to evaluate the hazard ratio (HR) and 95% confidence interval (CI) for the development of ATIL. Variables with p values < 0.2 in the univariate analysis were included in multivariate analysis. p values of <0.05 were considered to be statistically significant.

Results

Incidence of ATIL and comparison of the clinical features of ATIL and non-ATIL cases

Among the total population of 1362 IBD patients (965 CD patients, 397 UC patients) treated with anti-TNF agents at our IBD center, 50 cases were referred to our hospital’s rheumatology clinic due to a suspicion of rheumatic disease. The main reasons for this referral were arthralgia in 23 (46%), mucocutaneous lesion in 7 (14%), fever in 4 (8%), cytopenia in 4 (8%), serositis in 2 (4%), proteinuria and/or hematuria in 2 (4%), abnormal liver function test in 1 (2%), cerebral venous thrombosis in 1 (2%), chest pain in 1 (2%), and others in 5 (10%) patients. ATIL was definitively diagnosed in 14 (1.0%) patients, comprising 10 CD and 4 UC cases.

The clinical characteristics of 50 patients are summarized in Table 1. The median age at the commencement of the anti-TNF therapy was 30 years (IQR 25–45); 39 (78%) patients had CD, and 11 (22%) patients had UC. The median IBD activity score at baseline was a CDAI score of 256.5 (IQR 224.4–284.6) in 35 CD patients and a partial Mayo score of six (IQR 5–7) in 11 UC patients. ANA and anti-dsDNA were both positive in 25 (50%) patients. The ATIL group cases (n = 14) were more likely to be female (78.6% versus 47.2%, p = 0.045), and have a longer disease duration [median 8.7 (IQR 5.7–16.7) versus 5.0 (IQR 1.3–9.1) years, p = 0.013] than the non-ATIL patients (n = 36). Patients with a disease duration of 5 years or more were more common in the ATIL group than in the non-ATIL group (85.7% versus 50%, p = 0.021). The duration of anti-TNF treatment until the final follow-up date was shorter in the ATIL group [median 1.8 (IQR 0.9–5.5) versus 6.6 (IQR 3.8–8.7) years, p = 0.016]. All other baseline characteristics, including age, IBD type, IBD activity, and concomitant medications were not significantly different between the groups. However, the ATIL group had a lower IBD remission rate at the final follow-up date [30.8% (4/13) versus 68.8% (22/32), p = 0.019]. Of particular note in the CD patients, the CDAI score at the final follow-up date was greater in the ATIL group [median 222.7 (IQR 174.8–302.9) versus 83.7 (IQR 30.9–149.5), p < 0.001].

Table 1.

Clinical characteristics of the inflammatory bowel disease patients treated with anti-TNF agents.

Variable	All (n = 50)	Non-ATIL (n = 36)	ATIL (n = 14)	p value
Age at anti-TNF treatment start, years	30 (25–45)	30 (24–44)	36 (28–48)	0.157
Female gender	28 (56%)	17 (47.2%)	11 (78.6%)	0.045
IBD type
Crohn’s disease	39 (78%)	29 (80.6%)	10 (71.4%)	0.476
Ulcerative colitis	11 (22%)	7 (19.4%)	4 (28.6%)	0.476
Disease duration prior to anti-TNF treatment, years	5.8 (1.8–11.2)	5.0 (1.3–9.1)	8.7 (5.7–16.7)	0.013
Anti-TNF agents used
Infliximab	31 (62%)	20 (55.6%)	11 (78.6%)	0.132
Adalimumab	11 (22%)	9 (25%)	2 (14.3%)	0.705
Infliximab/adalimumab	8 (16%)	7 (19.4%)	1 (7.1%)	0.414
Duration of anti-TNF treatment, years	5.6 (1.9–8.0)	6.6 (3.8–8.7)	1.8 (0.9–5.5)^a	0.016
Smokers	3 (6%)	3 (8.3%)	0 (0%)	0.550
Concomitant treatment at anti-TNF treatment start
5-ASA/sulfasalazine	34 (68%)	24 (66.7%)	10 (71.4%)	1.000
Corticosteroid	12 (24%)	10 (27.8%)	2 (14.3%)	0.468
AZA/6-MP or methotrexate	30 (60%)	22 (61.1%)	8 (57.1%)	0.797
IBD activity at anti-TNF treatment start
CDAI^b	256.5 (224.4–284.6)	267.4 (231.5–292.3)	228.8 (164.1–260.4)	0.090
Partial Mayo score	6 (5–7)	6 (5–7)	5.5 (3.5–8.3)	0.927
IBD activity at final follow-up date
Remission^b	26/45 (57.8%)	22/32 (68.8%)	4/13 (30.8%)	0.019
CDAI^b	119.4 (51.4–205.3)	83.7 (30.9–149.5)	222.7 (174.8–302.9)	<0.001
Partial Mayo score	1 (0–5)	2 (0–7)	1 (0.25–4)	0.648

Data are expressed as a median value (interquartile range) or as a number of patients (%).

Duration of treatment prior to ATIL onset.

Four patients at baseline and five cases at the final follow-up date were excluded due to the presence of an ileostomy or colostomy.

5-ASA, 5-aminosalicylic acid; 6-MP, 6-mercaptopurine; ATIL, anti-TNF-induced lupus; AZA, azathioprine; CDAI, Crohn’s disease activity index; IBD, inflammatory bowel disease; TNF, tumor necrosis factor.

Clinical characteristics and outcomes of ATIL

The clinical characteristics and outcomes among the ATIL patients are detailed in Table 2. The median age at the diagnosis of ATIL was 38 years (IQR 35–47). The clinical features of ATIL arose after a median of 19 months (range, 9–64) of anti-TNF treatment. The most prevalent clinical feature was arthritis in 13 (92.9%) patients, followed by mucocutaneous lesions (i.e., malar rash, photosensitivity, and oral ulcer) in 4 (28.6%) patients and myalgia in 3 (21.4%) patients. Fatigue and cytopenia were found in two (14.3%) cases, and fever and serositis in one (7.1%) patient. One of the ATIL patients presented with acute kidney injury and hematuria after 6 years of anti-TNF treatment without concomitant medication, and tubulointerstitial disease was identified from a renal biopsy in this case. All of the ATIL patients had positive results for ANA (titers, 1:1280 in 10; 1:640 in two; and 1:320 and 1:160 in one patient each) and anti-dsDNA [titers showing a median of 54.4 IU/ml (IQR 21.0–82.4)]. Among the 12 patients who performed anti-ENA antibody tests, 2 also showed anti-Ro positivity. Rheumatoid factor was positive in 2 of the 11 ATIL patients who were assessed.

Table 2.

Clinical features and outcomes in the anti-TNF-induced lupus patients.

Variable	Number of patients (n = 14)
Clinical characteristics
Arthritis	13 (92.9%)
Mucocutaneous symptom	4 (28.6%)
Myalgia	3 (21.4%)
Fatigue	2 (14.3%)
Cytopenia	2 (14.3%)
Fever	1 (7.1%)
Serositis	1 (7.1%)
Renal involvement	1 (7.1%)
Time to symptom onset, months	19 (9–64)
Autoantibodies
ANA	14 (100%)
Anti-dsDNA titer, IU/ml	54.4 (21.0–82.4)
Anti-ENA
Ro	2/12 (16.7%)
La	1/12 (8.3%)
RNP	1/12 (8.3%)
Sm	0/12 (0%)
Outcomes^a
Duration after ATIL diagnosis, months	32 (15–62)
Clinical resolution	13 (100%)
Time to clinical resolution, months	11.0 (2.5–41.0)
Resolution of anti-dsDNA positivity	4/12 (33.3%)
Treatment
Need for corticosteroids	6 (46.2%)
Need for NSAIDs	8 (61.5%)
Need for hydroxychloroquine	4 (30.8%)
Need for immunosuppressants	1 (7.7%)

Data are expressed as a median value (IQR) or as a number of patients (%).

Outcomes were evaluated in 13 patients.

ANA, anti-nuclear antibody; ATIL, anti-TNF-induced lupus; IQR, interquartile range; NSAIDs, nonsteroidal anti-inflammatory drug; TNF, tumor necrosis factor.

A total of 13 ATIL patients were followed up for a median of 32 months (IQR 15–62) after their diagnosis. All 13 ATIL patients had a clinical resolution after a median of 11.0 months (IQR 2.5–41.0). Anti-dsDNA titers were normalized in 4 (33.3%) of the 12 patients who were positive for this antibody and performed follow-up tests. Six ATIL patients (46.2%) required corticosteroid treatments (a medium dose in two patients and low dose in four patients). Oral cyclophosphamide was administered to an ATIL patient with tubulointerstitial disease, and the hematuria and acute kidney injury improved within 6 months of this treatment.

During the follow-up period for ATIL, the anti-TNF therapy was discontinued at diagnosis in one patient with serositis and one further case with fever, myalgia, and arthritis, both of which achieved clinical resolution without relapse (Figure 1). Among 11 patients who were maintained on anti-TNF agents, five patients with arthritis or skin rash showed improved clinical features with low doses of corticosteroid, nonsteroidal anti-inflammatory drugs, or hydroxychloroquine. However, the remaining six patients had no improvement. These six cases experienced resolution after discontinuation of the anti-TNF agents (in two patients) or a switch to vedolizumab (in three patients). The remaining ATIL patient was switched to a second anti-TNF agent (from adalimumab to infliximab) but did not achieve improvement. A clinical resolution was eventually achieved in this case after the discontinuation of infliximab.

Figure 1.

Clinical course of anti-TNF-induced lupus.

Risk factors associated with the occurrence of ATIL

We identified the risk factors for ATIL occurrence in our current cohort of IBD patients treated with anti-TNF agents (Table 3). Univariate Cox regression analysis revealed that the age at anti-TNF agent commencement (HR 1.055, 95% CI 1.005–1.108, p = 0.031), UC (HR 4.002, 95% CI 1.174–13.641, p = 0.027), and disease duration prior to anti-TNF treatment (HR 1.073, 95% CI 1.016–1.133, p = 0.011) were associated with ATIL occurrence. By multivariate analysis, UC (HR 7.017, 95% CI 1.822–27.030, p = 0.005) and a long disease duration prior to anti-TNF treatment (HR 1.118, 95% CI 1.042–1.198, p = 0.002) increased the risk of developing ATIL.

Table 3.

Risk factors for the occurrence of anti-TNF-induced lupus.

Variable	Univariate analysis		Multivariate analysis
	HR (95% CI)	p value	HR (95% CI)	p value
Age at anti-TNF treatment start, years	1.055 (1.005–1.108)	0.031
Female gender	3.284 (0.908–11.875)	0.070	3.855 (0.962–15.449)	0.057
UC (versus CD)	4.002 (1.174–13.641)	0.027	7.017 (1.822–27.030)	0.005
Disease duration prior to anti-TNF treatment, years	1.073 (1.016–1.133)	0.011	1.118 (1.042–1.198)	0.002
Anti-TNF agents used
Infliximab	2.162 (0.603–7.752)	0.237
Adalimumab	0.906 (0.200–4.116)	0.899
Infliximab/adalimumab	0.277 (0.036–2.128)	0.217
Smoker	0.045 (0.000–1054.732)	0.545
Concomitant treatment at anti-TNF treatment start
5-ASA/sulfasalazine	0.896 (0.279–2.882)	0.854
Corticosteroid	1.070 (0.232–4.932)	0.930
AZA/6-MP or methotrexate	0.738 (0.254–2.145)	0.577
IBD activity at anti-TNF treatment start
CDAI^a	0.995 (0.987–1.004)	0.268
Partial Mayo score	1.011 (0.605–1.689)	0.968

Data are expressed as a median value (interquartile range) or number of patients (%).

Variables with a p value < 0.2 in the univariate analysis were included in the multivariate analysis.

Four patients were excluded due to the presence of an ileostomy or colostomy.

5-ASA, 5-aminosalicylic acid; CD, Crohn’s disease; 6-MP, 6-mercaptopurine; AZA, azathioprine; CDAI, Crohn’s disease activity index; CI, confidence interval; HR, hazard ratio; IBD, inflammatory bowel disease; TNF, tumor necrosis factor; UC, ulcerative colitis.

Discussion

We found from our current analyses that ATIL is a rare clinical disease in IBD patients treated with anti-TNF agents, occurring more frequently in cases of UC and a long disease duration. IBD activity was also poorly controlled in patients with ATIL despite anti-TNF therapy. Newly developed arthritis and mucocutaneous lesions were found to be common symptoms of ATIL. However, we found also that the prognosis of ATIL was favorable, even in patients who were maintained on anti-TNF agents.

The induction of autoantibodies is common in patients receiving anti-TNF therapies. In the reported safety data for one of the commonly used anti-TNF agents, infliximab, ANA develops in 63.8% of rheumatoid arthritis (RA) patients and 49.1% of CD patients, and anti-dsDNA positivity develops in 13% of RA patients and 21.6% of CD patients, after treatment with this drug.¹² It must be noted, however, that the incidence of ATIL is low. Post-marketing studies on anti-TNF treatment have reported an ATIL occurrence rate of only 0.1–0.22%.^13,14 Prior IBD studies have indicated incidence rates ranging from 0.6% to 10%.^15–17 In our present study, ATIL was observed in 1% of the IBD patients at our hospital treated with anti-TNF agents, consistent with the findings of other studies. Notably in this regard, the incidence of ATIL is difficult to assess due to many confounding factors, including a lack of suspicion, various study designs, and difficulty in distinguishing ATIL from the extra-intestinal symptoms of IBD.

ATIL occurred in our current cases after 1–5 years of anti-TNF therapy, as also reported in previous studies.^18,19 Most of our current cases developed arthritis, and mucocutaneous lesions and myalgia were also recorded frequently in this population. We also observed one ATIL patient with tubulointerstitial nephritis with acute kidney injury and hematuria. Picardo et al. previously described polyarthritis in 14 of 18 ATIL patients, with a rash observed in five of these cases.¹⁹ Previous studies showed that renal involvement, which is rarely found in other types of drug-induced lupus, was observed in as many as 7–9% of ATIL patients.^5,8

With regard to the outcomes in our current ATIL cohort, all of the patients eventually had clinical resolution. However, the effects of maintenance, discontinuation, or switching of anti-TNF agents on the disease course of ATIL remains unclear. There have been several reports that ATIL improves after anti-TNF discontinuation.^20–23 On the other hand, we found from our current investigation that four ATIL patients with arthritis and skin rash were maintained on anti-TNF agents without relapse. A study by Beigel et al. reported similar findings, in which 16 of 18 ATIL patients had mild lupus-like symptoms and did not require intervention.¹⁶ We also found in our current series that the patients who were changed to vedolizumab or ustekinumab showed resolution of ATIL and no relapse. Yanai et al. also described two cases of successful change to natalizumab.²¹ Given these results, we speculate that anti-TNF agents could be maintained in ATIL cases with only mild symptoms. However, if the ATIL is not tolerable, discontinuation of anti-TNF agents or a switch to non-TNF targeted agents may be an option.

Our current ATIL group showed higher IBD activity during anti-TNF treatment compared with the non-ATIL cases in our series. This may be due to the association between anti-drug antibodies (ADAs) and ATIL development. ADAs are known to contribute to poor outcomes in IBD through an accelerated drug clearance.²⁴ Ishikawa et al. noted previously that ADA-positive RA patients were more likely to develop ANA after infliximab treatment compared with their ADA-negative counterparts (14–57% versus 17–33%).²⁵ Anti-dsDNA titers and interferon-alpha levels were also increased in ADA-positive patients and not in the ADA-negative cases. Consistently, Kiss et al. reported an inferior treatment efficacy in CD patients receiving anti-TNF agents if they were positive for anti-dsDNA antibodies.²⁶ In their study, Yukawa et al. indicated that increased ANA and anti-dsDNA titers are associated with a lack of response to infliximab in RA patients.²⁷ The association between ADAs, lupus-related autoantibodies, and IBD activity levels suggests the possibility that ATIL may be linked to a poor response of anti-TNF agents to IBD activity.

In our present analyses, UC and a long disease duration were found to be associated with ATIL occurrence. In previous reports, female gender, former smoker, old age, and no concomitant treatment were suggested risk factors for ATIL.^16,19,21,23 The coexistence of SLE and IBD is rare. UC is reported in 0.4% of SLE patients, and the concurrence of SLE and CD is even rarer.²⁸ The contribution of UC compared with CD as a risk factor for ATIL is poorly understood, but the different mechanisms between UC and CD may provide insights in this regard. A prior report has indicated that a cytokine shift from Th1 to Th2 mechanisms caused by anti-TNF agents may contribute to the pathogenesis of ATIL.²⁹ CD is associated mainly with Th1 mechanisms, whilst UC produces Th2 immune responses.³⁰ On the other hand, Beigel et al. reported that UC patients have a lower risk of anti-dsDNA positivity than CD patients,¹⁶ with an odds ratio of 0.19 (95% CI 0.04–0.86, p = 0.03). Notably, however, no association has been demonstrated between IBD type and the development of positive ANAs and onset of ATIL. Further research will thus be needed to interpret the association between IBD type and ATIL occurrence. A long disease duration also showed an association with ATIL in our current analyses. This finding was consistent with previously reported results showing that longer disease duration is a predictor of skin reaction in patients receiving anti-TNF agents.^31,32 Although not significantly different in our multivariate analysis, a female gender also tended to increase the risk of ATIL development in our present analyses. Our results collectively indicate that UC, a long disease duration, and female gender are potential risk factors for ATIL occurrence.

Our current study had some limitations of note, including those inherent to its retrospective design. There may have been a selection bias resulting from our analysis only of patients with suspected rheumatic diseases after anti-TNF exposure. Also, the incidence of ATIL may have been underestimated because the symptoms of ATIL may be assessed as extra-intestinal symptoms of IBD, and there may have been ATIL patients who have not visited a rheumatology clinic. Because the IBD activity score also includes symptoms similar to ATIL, the symptoms of ATIL may have contributed to the high IBD activity score in the ATIL group. An information bias may have also been present in the medical records that could have affected the results. Moreover, ANAs and anti-dsDNA antibodies were not measured prior to anti-TNF treatment and therapeutic drug monitoring and the results of ADA levels were not available. Nonetheless, our study findings have robustly demonstrated the characteristics and disease course aspects of ATIL in IBD patients from a single-center cohort. Based on our present observations, the likelihood of ATIL onset can be evaluated when there are suspected symptoms of lupus in patients undergoing anti-TNF treatment. It is notable that we used the diagnostic criteria for ATIL that are included the ACR criteria for SLE diagnosis. Our present data may help to predict the prognosis and develop future treatment strategies for ATIL in the IBD population.

In conclusion, ATIL has a low prevalence in anti-TNF treated IBD patients and UC and a long disease duration were associated with its development. The possibility of an ATIL onset should be considered if new lupus-related symptoms develop during anti-TNF treatments.

Footnotes

Author contribution

Study concept and design: SJC, SHP and YGK

Acquisition of data: SJC, SMA and SH

Analysis and interpretation of data: JSO, CKL, BY, BDY, SKY, SHP and YGK

Drafting of the manuscript: SJC, SHP and YGK

Critical revision of the manuscript for important intellectual content: all authors

Conflict of interest statement

The authors declare that there is no conflict of interest.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by grant to Y-G Kim from the Asan Institute for Life Sciences (grant number: 2020IL0037).

ORCID iDs

Byong Duk Ye

Suk-Kyun Yang

Sang Hyoung Park

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Anti-tumor necrosis factor-induced lupus in patients with inflammatory bowel disease: a hospital-based cohort study from Korea