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Fcγ receptor IIIb polymorphism and use of glucocorticoids at baseline are associated with infusion reactions to infliximab in patients with rheumatoid arthritis.
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MedLine Citation:
PMID:  20980704     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Infusion reaction is a major adverse event in patients with rheumatoid arthritis (RA) treated with infliximab. The possible factors including Fcγ receptor (FcγR) polymorphism associated with the development of infusion reactions in patients with RA receiving infliximab were prospectively examined.
METHODS: 96 patients with RA were enrolled and scheduled to receive infliximab at a dose of 3 mg/kg at weeks 0, 2 and 6 and every 8 weeks thereafter. Genetic polymorphisms for FcγR were examined in FCGR3A 176F/V and FCGR3B NA1/2 alleles by allele-specific PCR analysis.
RESULTS: An infusion reaction was observed in 17 patients (18%) during 52 weeks of treatment with infliximab. The FCGR3B NA1/NA1 genotype was found in 75% of the patients with infusion reactions and in only 37% of those without (p=0.01), whereas the FCGR3A 176F/V genotype was equally distributed in the patients with or without infusion reactions. Glucocorticoids were used in 53% of the patients who developed an infusion reaction and in 80% of those without an infusion reaction (p=0.02). A multivariable logistic regression model showed that the FCGR3B NA1/NA1 genotype and use of glucocorticoids at baseline could be used as independent predictive factors for infusion reactions (OR 6.1 (95% CI 1.9 to 24.3) and OR 0.26 (95% CI 0.08 to 0.84), respectively). The presence of anti-infliximab antibody during infliximab treatment was also associated with infusion reactions.
CONCLUSION: FCGR3B NA1/NA1 genotype, use of glucocorticoids and the presence of anti-infliximab antibody accounted for nearly all patients with RA who developed infusion reactions.
Authors:
Ayumi Okuyama; Hayato Nagasawa; Katsuya Suzuki; Hideto Kameda; Harumi Kondo; Kouichi Amano; Tsutomu Takeuchi
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-27
Journal Detail:
Title:  Annals of the rheumatic diseases     Volume:  70     ISSN:  1468-2060     ISO Abbreviation:  Ann. Rheum. Dis.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-14     Completed Date:  2011-02-17     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0372355     Medline TA:  Ann Rheum Dis     Country:  England    
Other Details:
Languages:  eng     Pagination:  299-304     Citation Subset:  IM    
Affiliation:
Rheumatology/Clinical Immunology, Saitama Medical Center, Saitama Medical University, Saitama, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Antibodies, Monoclonal / administration & dosage,  adverse effects*
Antirheumatic Agents / administration & dosage,  adverse effects*
Arthritis, Rheumatoid / drug therapy*,  genetics*,  immunology
Drug Administration Schedule
Drug Therapy, Combination
Epidemiologic Methods
Female
GPI-Linked Proteins / genetics
Genetic Predisposition to Disease
Glucocorticoids / therapeutic use
Humans
Infusions, Intravenous
Male
Middle Aged
Polymorphism, Genetic
Receptors, IgG / genetics*
Tumor Necrosis Factor-alpha / antagonists & inhibitors
Chemical
Reg. No./Substance:
0/Antibodies, Monoclonal; 0/Antirheumatic Agents; 0/FCGR3B protein, human; 0/GPI-Linked Proteins; 0/Glucocorticoids; 0/Receptors, IgG; 0/Tumor Necrosis Factor-alpha; 0/infliximab
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Ann Rheum Dis
Journal ID (hwp): annrheumdis
Journal ID (publisher-id): ard
ISSN: 0003-4967
ISSN: 1468-2060
Publisher: BMJ Group, BMA House, Tavistock Square, London, WC1H 9JR
Article Information
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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions
open-access:
Accepted Day: 29 Month: 8 Year: 2010
collection publication date: Month: 2 Year: 2011
Electronic publication date: Day: 27 Month: 10 Year: 2010
Volume: 70 Issue: 2
First Page: 299 Last Page: 304
ID: 3015102
PubMed Id: 20980704
Publisher Id: annrheumdis136283
DOI: 10.1136/ard.2010.136283

Fcγ receptor IIIb polymorphism and use of glucocorticoids at baseline are associated with infusion reactions to infliximab in patients with rheumatoid arthritis
Ayumi Okuyama1
Hayato Nagasawa1
Katsuya Suzuki1
Hideto Kameda12
Harumi Kondo2
Kouichi Amano1
Tsutomu Takeuchi12
1Rheumatology/Clinical Immunology, Saitama Medical Center, Saitama Medical University, Saitama, Japan
2Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
Correspondence: Correspondence to Professor Tsutomu Takeuchi, 35 Shinanomachi, Shinjuku-ku, Tokyo 160–8582, Japan; tsutake@z5.keio.jp

Introduction

Biological agents targeting a specific molecule provide an effective means for therapeutic management of rheumatoid arthritis (RA) due to their specificity and powerful functional capabilities, which has resulted in a paradigm shift in the treatment strategy of this disease.14 Despite their effectiveness, several adverse drug reactions associated with the use of biological agents have been identified, such as opportunistic infections and the development of hypersensitivity/infusion reactions. For example, approximately 10–23% of patients with RA experience infusion reactions (including fever, malaise, headaches, erythema and urticaria) to infliximab, a chimeric monoclonal IgG1 antibody against tumour necrosis factor α (TNFα), in combination with methotrexate (MTX).59 Although much less frequent, severe infusion reactions such as anaphylactic/anaphylactoid symptoms are also observed in patients with RA.8 Despite the fact that most of these reactions are only mild or moderate in severity, they may lead to discontinuation of treatment, which is of particular concern and highly relevant to daily clinical practice.9 It is tempting to speculate that biological agents may induce these reactions in a portion of susceptible patients by causing hypersensitivity to the given biological agents,10 in part through the immunogenicity of the agents or by direct effects on cellular functions through the Fc portion of the products.11

The Fc portion of IgG-based biological agents can bind to Fcγ receptors (FcγR) for clearing the agents and even affecting cellular functions including phagocytosis, antibody-dependent cellular cytotoxicity and neutrophil activation.12 FcγR consist of three major families which are encoded by eight genes: FCGRIA, FCGRIB, FCGR1C, FCGR2A, FCGR2B, FCGR2C, FCGR3A and FCGR3B. Functional allelic polymorphisms leading to distinct effector capabilities have been identified in the receptors FcγRIIa, FcγRIIb, FcγRIIIa and FcγRIIIb.12

Since the FCGR2A 131 H/R allele strongly influences the ability of FcγRIIa to bind human IgG2 but has only limited effects on IgG1 and IgG3 binding,12 we focused on the FCGR3A 158F/V and FCGR3B NA1/NA2 alleles and prospectively examined the possible association of these FCGR alleles, development of antibody to infliximab and clinical parameters with development of infusion reactions to infliximab in patients with RA.


Methods
Patients and treatment

Consecutive patients with RA who fulfilled the 1987 revised criteria of the American College of Rheumatology for the classification of RA13 and satisfied the Japanese guidelines for the use of anti-TNF biological agents14 were invited to participate in the study. Ninety-six patients showing incomplete response to MTX were enrolled after obtaining their written informed consent. The 2008 Declaration of Helsinki and the 2008 Ethical Guidelines for Clinical Research by the Japanese Ministry of Health, Labour and Welfare were strictly followed in this study. The patients were scheduled to receive infliximab at a dose of 3 mg/kg at weeks 0, 2, 6 and subsequently every 8 weeks added to MTX at the Saitama Medical Center between September 2003 and March 2008. The management of infusion was performed using a previously reported protocol15 approved by the University Institutional Review Board. We did not perform any premedication including histamine antagonists, paracetamol and additional glucocorticoids until the first infusion reaction developed in individual patients. Blood samples were taken for genotyping before initiation of infliximab, and anti-infliximab antibody (AIA) was measured at each infusion visit during the 52-week study.

Assessment of efficacy and safety

Patients were followed up longitudinally with examinations at baseline and at each regular infusion visit and emergency visit during the 52-week study. To monitor disease activity and disability, the 28-joint Disease Activity Score based on C reactive protein (DAS28-CRP) and serum levels of CRP, matrix metalloproteinase-3 (MMP-3) and Health Assessment Questionnaire-Disease Index (HAQ-DI) were determined. The attending physicians recorded any adverse drug reactions at baseline, at each regular infusion visit and emergency visit during the 52-week study period.

Measurement of AIA

AIA was measured using an ELISA kit (Immunodiagnostik, Bensheim, Germany). Briefly, serum samples were diluted with phosphate buffered saline (PBS) and added to 96-well plastic plates coated with the F(ab)2 portion of infliximab to avoid interference with rheumatoid factor (RF). After incubating overnight at 4°C, the wells were washed with PBS and horseradish peroxidase-labelled infliximab was added. After incubation for 60 min, the plates were extensively washed with PBS, followed by addition of substrates into each well. The OD450−OD620 was recorded using an ELISA reader.

Determination of FcγR polymorphisms

Heparinised venous blood was collected from patients and chromosomal DNA was isolated using phenol–chloroform extraction. Genetic polymorphisms for FcγR were examined in FCGR3A 176F/V and FCGR3B NA1/2 alleles by allele-specific PCR analysis, as previously described.16, 17 PCR products were separated on 3% agarose gels and visualised under ultraviolet light using a photoimager.

Statistical analysis

Baseline variables of patients with RA were analysed for association with development of infusion reactions using a χ2 test for categorical variables and Student t test for continuous variables. Univariate logistic regression analysis was used to screen for potential predictor variables, and a stepwise selection process was used to generate a multivariate model for potential predictors of infusion reactions. All statistical analyses were performed on a Mac OS X platform (Sun Microsystems, Palo Alto, California, USA) using JMP Version 8.0.2.


Results
Clinical characteristics of the patients with RA who developed infusion reactions

As shown in table 1, the development of infusion reactions, concomitant medications and the continuation of infliximab varied in individual patients. The observed infusion reactions were typically mild or moderate and included chills, fever, erythema and urticaria; however, one patient developed a severe anaphylactoid reaction and hypotension. Prior to the study, this patient had been enrolled in a clinical trial for infliximab, and the severe infusion reaction developed in this study after the second infusion, which represented a 3-year interval since he last received infliximab in the clinical trial. The most common manifestation in the patients was skin eruption (n=10), followed by fever (n=3), nausea/vomiting (n=3) and headache (n=2). Although these manifestations were not considered severe, nearly all of the patients (15 of 17) discontinued infliximab due to the development of these infusion reactions.

Demographics and clinical characteristics of the patients

As shown in table 2, the mean age of the patients was 54 years and 83% were women. The mean disease duration was 8 years, RF positivity was 90%, the mean DAS28 score was 5.2 and the mean serum HAQ-DI level was 1.5, suggesting that the patients with RA enrolled in this study were established, active and disabled.

There were no significant differences in the demographics and clinical characteristics between patients who developed infusion reactions and those who did not, with the exception of the concomitant use of glucocorticoids. Glucocorticoids were used in 53% of patients with infusion reactions compared with 80% of patients without infusion reactions. In contrast, no significant differences in the demographics and clinical characteristics between patients who continued infliximab and those who discontinued its use were demonstrated in this study.

FcγR polymorphism

Allele distributions in the patients with RA for the FCGR3A 176F/V and FCGR3B NA1/NA2 polymorphisms are summarised in table 3. In this cohort of patients, the distribution of the FCGR3A high-affinity genotype V/V was 6% whereas the V/F and F/F genotypes were observed with a frequency of 48% and 46%, respectively. The occurrence of the V/V genotype was slightly lower than in the healthy Japanese population (8.6%).18 The V/V genotype was enriched in patients with RA with infusion reactions (12%) over those without such reactions (5%), but the difference was not significant. The distributions of the genotypes for the FCGR3A 176F/V allele between patients with and without adherence to infliximab were comparable.

The high-affinity genotype of FCGR3B (NA1/NA1) was the most prevalent genotype in the patients with RA (44%), while the NA1/NA2 and NA2/NA2 genotypes were found in 33% and 23% of patients, respectively. The FCGR3B NA1/NA1 genotype was found in 70% of patients with infusion reactions but was present in only 37% of patients without infusion reactions, indicating that this genotype is associated with the development of infusion reactions. In contrast, the low-affinity genotypes NA1/NA2 and NA2/NA2 were only observed in 18% and 6%, respectively, of patients who developed infusion reactions, which is much lower than the 37% and 27%, respectively, of those without reactions. Analyses confirmed that the distribution of the FCGR3B genotypes between patients with and without infusion reactions was significantly different (p=0.01). On the other hand, such differences in distribution of the FCGR3B genotypes were not observed between those with and without adherence to infliximab.

The presence of AIA during each visit was found to be positive in 19% of the patients. The development of AIA was significantly higher in patients with infusion reactions than in those without (65% and 9%, respectively, p<0.001), whereas no difference was observed in patients with or without adherence to infliximab (15% and 22%, respectively, p=0.40).

Potential predictive variables for infusion reactions

The impact of the presence or absence of risk factors identified on the development of infusion reactions is summarised and compared in figure 1. In order to create a multivariate model of potential predictors of infusion reactions, we first screened a series of baseline variables which included age, gender, duration of RA, DAS score, levels of CRP, MMP-3, HAQ-DI, RF and antinuclear antibody, doses of MTX and prednisolone equivalent, glucocorticoid use and FCGR3A V/V+V/F and FCGR3B NA1/NA1 genotypes by univariate logistic regression. As shown in table 4, the FCGR3B NA1/NA1 genotype and use of glucocorticoids were significant predictive variables, consistent with the above analyses. Even by stepwise selection, these variables were identified as significant factors associated with infusion reactions (data not shown).

We next subjected these two variables to multivariate logistic regression analyses which allowed for differences in patients with or without infusion reactions to be adjusted. From these analyses, the FCGR3B NA1/NA1 genotype and use of glucocorticoids were finally identified as significant independent variables associated with the development of infusion reactions. The ORs of the FCGR3B NA1/NA1 genotype and the use of glucocorticoids were 6.1 (95% CI 1.9 to 24.3, p=0.002) and 0.26 (95% CI 0.08 to 0.84, p=0.025), respectively (table 5).

Finally, we examined the potential additive effect of the three identified factors on the development of infusion reactions. Patients with RA with only one factor had a rate of infusion reactions of 11%, whereas those with two or three factors had rates of 53% and 100%, respectively (see figure in online supplement), demonstrating that these three factors additively account for the infusion reactions to infliximab observed in the 96 patients with RA examined in this study.


Discussion

The results of this study show that the high-affinity FCGR3B NA1/NA1 genotype and the absence of glucocorticoid use at baseline are the main independent predictive factors for the development of infusion reactions to infliximab in Japanese patients with RA. This study is the first to demonstrate a role for the FCGR3B NA1/NA1 genotype in infusion reactions to infliximab.

Mild to moderate and severe infusion reactions were observed in 18% and 1%, respectively, of the Japanese patients with RA treated with infliximab during the 52-week course of this study. This result is consistent with previous studies showing that the incidence of infusion reactions to infliximab was approximately 10–23% of patients with RA per year.57, 8, 15 The most frequent manifestations of the infusion reactions observed in this study were consistent with those reported for infusion reactions to infliximab in clinical practice settings in both the USA5 and Japan.8 A significant proportion of these patients subsequently discontinued infusion, implying that infusion reactions may account, as well as lack of efficacy, for the low retention rate of infliximab observed in the first year of treatment,9, 1921 while others do not.22, 23 The inconsistency of the retention rate for infliximab among studies may result from the variable management strategies used to reduce infusion reactions, which include premedication,5 gradual increases in infusion speed,7 adjustment of infusion intervals24 and dose increments,25 among others.

It has been shown using radiolabelled infliximab in patients with RA that the formation of infliximab and anti-infliximab complexes were found in non-responders, one of which showed an anaphylactoid reaction, resulting in higher liver/spleen uptake and rapid clearance of infliximab.11 It was recently observed that the IgE class of AIA is associated with the development of severe infusion reactions,26 whereas true IgE-mediated hypersensitivity is not related to acute infusion reactions in most cases.27 This possibility in one patient who developed an anaphylactoid reaction in this cohort remains to be addressed.

We found that 19% of the patients with RA developed AIA during the 52-week study period. The reported prevalence of AIA in patients with RA varies from 12% to 44% and appears to be inversely proportional to the serum levels of infliximab and therapeutic response.28 The dose of MTX did not significantly affect the development of AIA in our study (data not shown). In this study, infusion reactions frequently occurred between 14 and 30 weeks after initiating infliximab. Since the infusion interval was increased to 8 weeks after induction at 0, 2 and 6 weeks, the serum trough levels of infliximab probably lowered at the infusions with 8-week intervals, supporting the above observation in this study. However, the precise mechanisms related to AIA and the development of infusion reactions are not fully understood and require further study.

Numerous studies have analysed the possible association between FCGR2A and FCGR3A polymorphisms and the efficacy of biological agents against TNFα in patients with RA.2931 However, the association between these polymorphisms and the adverse effects of anti-TNFα has not been fully explored. In this regard, the FCGR3B NA2 allele has been shown to be associated with urinary tract infections in patients with RA treated with MTX or etanercept.32 FcγRIIIb is expressed exclusively on neutrophils, eosinophils12 and basophils.33 The isoform containing the FCGR3B NA1 allele produces larger phagocytic, oxidative burst and degranulation responses than the FCGR3B NA2 allele.32 Thus, the FCGR3B NA1/NA1 genotype with high affinity to Ig present on the surface of neutrophils, eosinophils and basophils may account for the higher incidence of infusion reactions to infliximab. In addition, optimal ligand concentrations leading to formation of immune complexes may allow binding to FcγRIIIb and subsequent activation of cells.34 Recently, variation in the copy number of FCGR3B has been shown to be associated with susceptibility to systemic autoimmunity.35 Copy number variation of FCGR3B may play a role in infusion reactions and warrants further examination.

One may speculate that glucocorticoids may interfere with the binding, activation and effector function of immune cells, thereby reducing the severity and frequency of infusion reactions. Some of these effects may be shared with MTX. In this study, the concomitant use of oral glucocorticoids was significantly associated with a reduced risk of developing an infusion reaction, consistent with recent reports.9, 36 Therefore, not only the moderate- to high-dose glucocorticoids given as a premedication, but also the low-dose daily glucocorticoids may be a potent inhibitor of infusion reactions. FcγRIIIb is a phosphatidyl inositol-linked cell surface protein and thus lacks any self-kinase activity. Instead, FcγRIIa is coupled with FcγRIIIb to transduce signals. As one of the functional polymorphisms in FcγRIIa is the 131H allele which confers receptor affinity to IgG2 subclass, it is unlikely that this receptor plays a direct role in binding to the IgG1 monoclonal antibody infliximab. Nevertheless, the possibility that other polymorphisms of FCGR2A associated with receptor function contribute to infusion reactions should be examined.

There are a number of limitations that warrant mention. First, the number of patients examined in this study was insufficient to demonstrate an association between FCGR3A polymorphism and infusion reactions. Second, in addition to the small number of patients, other aspects of the study design also imposed limitations. For example, the study was designed to monitor infusion reactions during 52 weeks, meaning that infusion reactions appearing after 52 weeks could not be addressed. Third, this was an open-label study which may have affected the incidence and severity of infusion reactions and the response and retention rates. However, the incidence and the types of infusion reactions in this study were comparable to those of previous reports, as were the other results related to the efficacy and retention rate of infliximab.37, 38 Also, AIA is typically developed during the treatment period and this information would not be available before starting infliximab; it is apparent that the presence of AIA is limited in its use as a predictive marker. When the two risk factors excluding AIA are used as predictive variables, they were still associated with approximately 40% of infusion reactions observed in this study (data not shown).

In summary, we have shown that the FCGR3B NA1/NA1 genotype and the absence of glucocorticoid usage are predictive factors of infusion reactions in patients with RA. Premedication for infliximab may therefore not be necessary for all patients but only for those with the FCGR3B NA1/NA1 genotype without daily glucocorticoids.


Notes

Funding Part of this study was supported by a Research Grant-In-Aid for Scientific Research by the Ministry of Health, Labour and Welfare of Japan.

Competing interests None of authors are industry employees. TT has received consultant fees from Mitsubishi-Tanabe Pharma, Bristol-Myers-Squibb and Novartis, and lecture fees from Mitsubishi-Tanabe Pharma, Takeda Pharmaceutical, Abbott, Eisai Pharma and Chugai Pharma. HK received honoraria from Mitsubishi-Tanabe Pharma, Centocor, Wyeth Japan, Takeda Pharmaceutical, Abbott, Eisai Pharma and Chugai Pharma.

Patient consent Obtained.

Ethics approval This study was conducted with the approval of the internal review board of Saitama Medical University.

Provenance and peer review Not commissioned; externally peer reviewed.

The authors thank all medical staff of Saitama Medical University and Keio University.


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Figures

[Figure ID: F1]
Figure 1 

Percentage of patients with rheumatoid arthritis who developed an infusion reaction during the 52-week study in those with or without anti-infliximab antibody, those with or without FCGR3B NA1/NA1 genotype and those with or without concomitant use of glucocorticoids.



Tables
[TableWrap ID: T1] Table 1 

Demographic and clinical characteristics of patients with infusion reactions


No Gender Age (year) Duration (month) DAS28 at baseline CRP (mg/dl) RF (IU/ml) ANA (×) MMP-3 (ng/ml) HAQ-DI Clinical manifestation Time of infusion reaction (weeks) MTX (mg/week) PRED (mg/day) Adherence to infliximab
1 F 51 60 6.9 7.8 12 160 346 2.6 Chills, fever, dyspnoea 38 13 0 Discontinue
2 F 52 9 6.6 6.9 444 0 188 2.1 Hot flushes, headache, subfever 1 8 10 Continue
3 M 69 624 5.7 3.9 191 80 180 1.8 Anaphylactoid reaction, hypotension 2 (after 3-year interval) 6 5 Discontinue
4 F 40 50 4.8 2.9 864 80 200 1.3 Urticaria 14 12.5 0 Discontinue
5 F 50 97 3.5 0.3 23 80 121 0.3 Urticaria 30 10.5 5 Discontinue
6 F 68 48 4.5 3.2 42 80 95 0.13 Erythema 14 8 0 Discontinue
7 M 65 240 4.8 2.8 1080 320 85 2.6 Hot flushes, headache, nausea 14 10 3 Discontinue
8 F 52 255 5.7 3.3 845 160 191 1.3 Erythema 30 8 0 Discontinue
9 F 31 29 4.8 0.1 17 1280 98 0.5 Nausea 44 8 0 Discontinue
10 F 60 210 4.2 1.8 250 80 359 0.6 Urticaria 14 8 0 Discontinue
11 F 52 168 3.5 0.3 15 1280 121 0.3 Urticaria 2 6 0 Discontinue
12 F 57 360 6.6 6.4 98 1280 360 1.5 Erythema 14 6 4 Discontinue
13 F 33 21 6.6 5.2 122 80 612 1.1 Erythema 14 10 4 Continue
14 F 37 9 7.5 5.6 <5 0 280 1.9 Fever 14 6 10 Discontinue
15 F 37 60 4.3 1.4 446 80 ND 0.8 Erythema 30 8 0 Continue
16 F 63 4 7.4 11.0 1060 80 412 2.5 Nausea, vomiting 14 8 7.5 Discontinue
17 F 64 134 6.0 0.8 <5 1280 253 1.9 Erythema 22 6 0 Discontinue

ANA, antinuclear antibody; CRP, C reactive protein; DAS28, 28-joint Disease Activity Score; HAQ-DI, Health Assessment Questionnaire-Disease Index; MMP, matrix metalloproteinase; MTX, methotrexate; ND, not done; PRED, prednisolone; RF, rheumatoid factor.


[TableWrap ID: T2] Table 2 

Patient characteristics and infliximab-related outcome


Infusion reaction during 52 weeks Adherence to infliximab during 52 weeks
Subject Total (n=96) Yes (n=17) No (n=79) p Value Continued (n=46) Discontinued (n=50) p Value
Age (years) 54±13 52±12 55±13 0.82 56±12 53±14 0.16
Female (%) 83 88 81 0.55 89 78 0.14
Disease duration (years) 8±9 11±14 8±8 0.18 8±7 9±10 0.57
RF positivity (%) 90 88 90 0.84 91 88 0.60
RF (IU/ml) 213±321 324±394 189±300 0.10 190±319 145±324 0.79
ANA positivity (%) 32 41 30 0.39 30 34 0.71
ANA titre (×) 273±616 377±150 251±69 0.20 341±813 211±346 0.16
Stage I+II (%) 44 47 43 0.46 33 43 0.05
Class 1+2 (%) 65 82 62 0.18 65 64 0.53
DAS28 5.2±1.3 5.4±1.6 5.2±1.3 0.69 5.1±1.5 5.4±1.2 0.22
CRP (mg/dl) 4.0±3.3 4.1±3.0 3.9±3.4 0.87 3.5±3.4 4.3±3.2 0.26
MMP-3 (ng/ml) 293±287 146±38 301±309 0.36 340±374 255±189 0.17
HAQ-DI 1.5±0.8 1.4±0.9 1.5±0.7 0.76 1.5±0.8 1.5±0.7 0.96
MTX dose (mg/week) 8±3 8±2 8±3 0.35 8±4 9±3 0.95
Use of glucocorticoids (%) 75 53 80 0.02* 74 76 0.81
Glucocorticoid dose (mg/day) 4±3 3±4 5±3 0.92 5±4 4±3 0.19

ANA, antinuclear antibody; CRP, C reactive protein; DAS28, 28-joint Disease Activity Score; HAQ-DI, Health Assessment Questionnaire-Disease Index; MMP, matrix metalloproteinase; MTX, methotrexate; RF, rheumatoid factor.


[TableWrap ID: T3] Table 3 

Association of Fcγ receptor polymorphism and anti-infliximab antibody (AIA) with infliximab-related outcome


Infusion reaction during 52 weeks Adherence to infliximab during 52 weeks
Subject Total (n=96) Yes (n=17) No (n=79) p Value Continued (n=46) Discontinued (n=50) p Value
FCGR3A 176F/V
 F/F 44 (46) 7 (41) 37 (47) 0.58 22 (48) 22 (44) 0.53
 F/V 46 (48) 8 (47) 38 (48) 20 (44) 26 (52)
 V/V 6 (6) 2 (12) 4 (5) 4 (9) 2 (4)
FCGR3B NA1/NA2
 NA1/NA1 42 (44) 13 (77) 29 (37) 0.01* 16 (35) 26 (52) 0.23
 NA1/NA2 32 (33) 3 (18) 29 (37) 18 (39) 14 (28)
 NA2/NA2 22 (23) 1 (6) 21 (27) 12 (26) 10 (20)
AIA
 (+) 18 (19) 11 (65) 7 (9) <0.01* 7 (15) 11 (22) 0.40
 (−) 78 (81) 6 (35) 72 (91) 39 (85) 39 (78)

Values are numbers (%) unless otherwise indicated.


[TableWrap ID: T4] Table 4 

Univariate logistic regression analysis for potential predictors of infusion reaction


Variables Estimates SE OR p Value
Age (years) −0.02 0.02 0.98 0.37
Gender (female vs male) 0.24 0.40 1.62 0.55
Duration (years) 0.04 0.03 1.04 0.12
DAS28 0.08 0.21 1.08 0.69
CRP (mg/dl) 0.01 0.08 1.01 0.87
MMP-3 (per 10 ng/ml) −0.01 0.01 0.99 0.55
HAQ-DI −0.12 0.39 0.89 0.75
RF (per 10 IU/ml) 0.01 0.00 1.00 0.14
ANA (×) 0.00 0.00 1.00 0.46
MTX (mg/week) 0.03 0.09 1.03 0.77
MTX duration (months) 0.00 0.01 1.00 0.72
Use of glucocorticoids −0.63 0.28 0.53 0.03*
Dose of prednisolone (mg/day) −0.13 0.09 0.88 0.14
FCGR3A V/V+V/F vs F/F 0.11 0.27 1.12 0.67
FCGR3B NA1/1 vs NA1/2+2/2 0.86 0.31 2.37 <0.01*

ANA, antinuclear antibody; CRP, C reactive protein; DAS28, 28-joint Disease Activity Score; HAQ-DI, Health Assessment Questionnaire-Disease Index; MMP, matrix metalloproteinase; MTX, methotrexate; RF, rheumatoid factor.


[TableWrap ID: T5] Table 5 

Multivariate model of predictors of infusion reaction by logistic regression


Estimates OR 95% CI p Value
FCGR3B NA1/1: NA2/2+NA1/2 0.90 6.1 1.9 to 24.3 <0.01
Glucocorticoid use −0.68 0.26 0.08 to 0.84 0.03


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