Evolving definitions of remission in Crohn's disease.
; ; Louis, Edouard et al
in Inflammatory bowel diseases (2013), 19(8), 1645-53
BACKGROUND: Using clinical symptoms alone to inform treatment decisions in Crohn's disease (CD) may increase the risk of disease progression and complications. Treatment beyond symptoms may offer improved ... [more ▼]
BACKGROUND: Using clinical symptoms alone to inform treatment decisions in Crohn's disease (CD) may increase the risk of disease progression and complications. Treatment beyond symptoms may offer improved outcomes. METHODS: We explore alternative definitions of remission, beyond traditional clinical remission, incorporating more objective parameters of inflammation control, which may support prevention or delay the disease progression. These definitions could serve as a platform for future clinical research, evaluating whether treating beyond symptoms alters the natural history of CD. RESULTS: Proposed definitions may include endoscopic remission (mucosal healing), normalization of serologic or fecal markers of inflammation, and even radiographic remission, in addition to clinical remission (symptom control). Endoscopic remission is the leading candidate for inclusion because it is the best studied. The definition should include considerations for both early and late disease given that in late disease, which may be associated with operation-related symptoms or irreversible bowel damage, symptomatic remission may not achievable. Desired outcomes in early disease are complete absence of symptoms, no disease progression, no complications or disability, and normal quality of life. In late disease, there are stabilization of noninflammatory symptoms, no progression of damage or disability, and improved quality of life. CONCLUSIONS: Over time, we anticipate that a working definition of remission that includes both biological remission and clinical remission will evolve and be evaluated in clinical trials. Our proposed definition is a possible starting point for that evolution. Ultimately, the goal in evolving the definition of remission is to improve the outcomes in patients with CD. [less ▲]Detailed reference viewed: 7 (0 ULg)
Consecutive fecal calprotectin measurements to predict relapse in patients with ulcerative colitis receiving infliximab maintenance therapy.
; Louis, Edouard ; et al
in Inflammatory bowel diseases (2013), 19(10), 2111-7
BACKGROUND: This study examined whether fecal calprotectin can be used in daily practice as a marker to monitor patients with ulcerative colitis (UC) receiving infliximab maintenance therapy. METHODS ... [more ▼]
BACKGROUND: This study examined whether fecal calprotectin can be used in daily practice as a marker to monitor patients with ulcerative colitis (UC) receiving infliximab maintenance therapy. METHODS: This prospective multicenter study enrolled adult patients with UC in clinical remission under infliximab maintenance therapy. Fecal calprotectin levels were measured every 4 weeks. Sigmoidoscopies were performed at inclusion and at study end. Relapse was defined as a clinical need for change in treatment or an endoscopic Mayo subscore of >/=2 at week 52. Sustained deep remission was defined as a partial Mayo score <3 at all points and an endoscopic Mayo score 0 at week 52. RESULTS: Full analysis was possible for 87 of 113 included patients with UC (77%). Of these patients, 30 (34.4%) were considered to be in sustained deep remission and 13 (14.9%) to have relapsed. Calprotectin levels in patients with sustained deep remission remained very low (median < 40 mg/kg at all time points). Patients who flared had significantly higher calprotectin levels (median > 300 mg/kg) already 3 months before the flare. Further receiver operator curve analysis suggested that a calprotectin level >300 mg/kg had a reasonable sensitivity (58.3%) and specificity (93.3%) to model flare. Two consecutive calprotectin measurements of >300 mg/kg with 1-month interval were identified as the best predictor of flare (61.5% sensitivity and 100% specificity). CONCLUSIONS: Fecal calprotectin can be used in daily practice to monitor patients with UC receiving infliximab maintenance therapy. Two consecutive measurements >300 mg/kg is more specific than a single measurement for predicting relapse. [less ▲]Detailed reference viewed: 6 (1 ULg)
Serum adalimumab concentration and clinical remission in patients with Crohn's disease.
; ; et al
in Inflammatory bowel diseases (2013), 19(6), 1112-22
BACKGROUND: Drug concentration monitoring may be useful to guide therapeutic adjustments for anti-tumor necrosis factor agents in Crohn's disease. The relationship between serum adalimumab concentrations ... [more ▼]
BACKGROUND: Drug concentration monitoring may be useful to guide therapeutic adjustments for anti-tumor necrosis factor agents in Crohn's disease. The relationship between serum adalimumab concentrations and clinical outcomes was assessed using data from CLinical Assessment of Adalimumab Safety and Efficacy Studied as Induction Therapy in Crohn's Disease (CLASSIC) I/II. METHODS: Serum adalimumab concentrations at week 4 of CLASSIC I and weeks 4, 24, and 56 of CLASSIC II were compared by clinical remission status (yes/no). Logistic regression and Classification and Regression Tree analyses explored factors associated with remission at weeks 4, 24, and 56. Threshold analyses and receiver operating characteristic curves evaluated the relationship between serum concentrations and clinical remission/response. RESULTS: Serum adalimumab concentrations for 275 patients were available. Median adalimumab concentrations were significantly higher in patients who achieved clinical remission than those who did not at week 4 of CLASSIC I (8.10 versus 5.05 microg/mL, P < 0.05). At all time points, adalimumab concentrations demonstrated considerable variability and overlap between patients with and without remission. With Classification and Regression Tree analyses, baseline Crohn's Disease Activity Index, baseline C-reactive protein, and adalimumab concentrations were associated with early remission at week 4 of CLASSIC I and week 4 of CLASSIC II, but not at weeks 24 and 56. Receiver operating characteristic curves demonstrated low utility of cutoff thresholds to discriminate by clinical response/remission status. CONCLUSIONS: A positive association between serum adalimumab concentration and remission was identified at several time points. A threshold concentration reliably associated with remission was not identified. Further prospective evaluations are needed before recommendations for adalimumab concentration monitoring can be made. [less ▲]Detailed reference viewed: 9 (1 ULg)
Natalizumab to kill two birds with one stone: A case of celiac disease and multiple sclerosis.
Phan-Ba, Rémy ; LAMBINET, Nadine ; Louis, Edouard et al
in Inflammatory Bowel Diseases (2011), 17(6), 62-63Detailed reference viewed: 40 (16 ULg)
Identification of a novel autoantigen in inflammatory bowel disease by protein microarray.
; ; et al
in Inflammatory Bowel Diseases (2011), 17(6), 1291-300
BACKGROUND: Patients with inflammatory bowel disease (IBD) display immunoreactivity to self-antigens and microbial antigens. We used a protein microarray approach to identify novel autoantigens in IBD ... [more ▼]
BACKGROUND: Patients with inflammatory bowel disease (IBD) display immunoreactivity to self-antigens and microbial antigens. We used a protein microarray approach to identify novel autoantigens in IBD. METHODS: ProtoArray Human Protein Microarray v4.0 containing 8268 human proteins from Invitrogen (La Jolla, CA) was used. RESULTS: Twenty-five IBD patients and five healthy controls were screened for candidate autoantigens. For 256 antigens, IBD patients had a higher seroreactivity than controls. Twenty antigens were selected for further evaluation in a larger cohort (60 ulcerative colitis [UC] patients, 60 Crohn's disease [CD] patients, 60 healthy controls, and 60 gastrointestinal-diseased controls) by means of a customized protein microarray. Out of these 20 antigens, one antigen, family with sequence similarity 84 member A (FAM84A), was identified as a target antigen in IBD. Antibodies to FAM84A were significantly more prevalent in IBD patients (19%) than in gastrointestinal-diseased controls (1.7%) (P = 0.0008) and healthy controls (5%) (P = 0.01). Anti-FAM84A antibodies were found in 26.6% of UC patients and in 11.7% of CD patients. FAM84A was confirmed as target antigen in IBD by means of Western blotting in a large independent cohort (100 UC patients, 106 CD patients, 102 healthy controls, and 100 gastrointestinal-diseased controls). Antibodies to FAM84A were significantly more prevalent in IBD patients (20%) than in gastrointestinal-diseased controls (5%) (P = 0.0004) and healthy controls (0%) (P < 0.0001). Anti-FAM84A antibodies were found in 18% of UC patients and in 22% of CD patients. CONCLUSIONS: We identified FAM84A as a novel autoantigen in IBD. (Inflamm Bowel Dis 2011;). [less ▲]Detailed reference viewed: 16 (3 ULg)
Development of the Crohn's disease digestive damage score, the Lemann score.
; ; et al
in Inflammatory Bowel Diseases (2011), 17(6), 1415-22
Crohn's disease (CD) is a chronic progressive destructive disease. Currently available instruments measure disease activity at a specific point in time. An instrument to measure cumulative structural ... [more ▼]
Crohn's disease (CD) is a chronic progressive destructive disease. Currently available instruments measure disease activity at a specific point in time. An instrument to measure cumulative structural damage to the bowel, which may predict long-term disability, is needed. The aim of this article is to outline the methods to develop an instrument that can measure cumulative bowel damage. The project is being conducted by the International Program to develop New Indexes in Crohn's disease (IPNIC) group. This instrument, called the Crohn's Disease Digestive Damage Score (the Lemann score), should take into account damage location, severity, extent, progression, and reversibility, as measured by diagnostic imaging modalities and the history of surgical resection. It should not be "diagnostic modality driven": for each lesion and location, a modality appropriate for the anatomic site (for example: computed tomography or magnetic resonance imaging enterography, and colonoscopy) will be used. A total of 24 centers from 15 countries will be involved in a cross-sectional study, which will include up to 240 patients with stratification according to disease location and duration. At least 120 additional patients will be included in the study to validate the score. The Lemann score is expected to be able to portray a patient's disease course on a double-axis graph, with time as the x-axis, bowel damage severity as the y-axis, and the slope of the line connecting data points as a measure of disease progression. This instrument could be used to assess the effect of various medical therapies on the progression of bowel damage. [less ▲]Detailed reference viewed: 36 (0 ULg)
Adalimumab produces clinical remission and reduces extraintestinal manifestations in Crohn's disease: Results from CARE.
; Louis, Edouard ; et al
in Inflammatory Bowel Diseases (2011)
BACKGROUND: Data regarding the effectiveness of anti-tumor necrosis factor (TNF) agents for resolution of extraintestinal manifestations (EIMs) are scarce. The CARE study evaluated clinical effectiveness ... [more ▼]
BACKGROUND: Data regarding the effectiveness of anti-tumor necrosis factor (TNF) agents for resolution of extraintestinal manifestations (EIMs) are scarce. The CARE study evaluated clinical effectiveness, EIM resolution, and safety of adalimumab in a large pan-European cohort of patients with moderate to severe Crohn's disease (CD). METHODS: In all, 945 patients with a Harvey-Bradshaw Index (HBI) >/=7 enrolled in this multicenter, open-label phase IIIb trial. Patients received subcutaneous adalimumab, 160/80 mg at weeks 0/2, then 40 mg every other week. Dose adjustments were allowed for CD-related concomitant medications (from week 8) and adalimumab (from week 12). Clinical endpoints were analyzed through week 20 for all patients, and after stratification by prior infliximab exposure and by reason for discontinuing infliximab (primary nonresponse [PNR] or other). RESULTS: The remission rate (HBI <5) at week 20 was 52% (95% confidence interval, 49%-55%) overall, and was higher for infliximab-naive versus infliximab-exposed patients (62% versus 42%, P < 0.001). Remission rates were similar for PNR (37%) and other reasons (43%; P = 0.278). Of 497 patients with baseline EIMs, 51% were free of EIM signs and symptoms at week 20. Serious infectious adverse events were reported in 5% of patients. Opportunistic infections and malignancies were rare (</=1%). There was one case of demyelinating disease, but no occurrences of lupus, tuberculosis, or death. CONCLUSIONS: In this large cohort of patients, adalimumab treatment resulted in rates of clinical remission and EIM resolution exceeding 50%, and substantial rates of effectiveness in patients who had PNR to infliximab. Adalimumab was well tolerated, with safety consistent with prior reports. (Inflamm Bowel Dis 2011). [less ▲]Detailed reference viewed: 29 (3 ULg)
Outcome of pregnancy in women with inflammatory bowel disease treated with antitumor necrosis factor therapy.
Schnitzler, François ; ; Boukerroucha, Meriem et al
in Inflammatory Bowel Diseases (2011), 17(9), 1846-1854
BACKGROUND:: Infliximab (IFX) and adalimumab (ADA) are attractive treatment options in patients with inflammatory bowel disease (IBD) also during pregnancy but there is still limited data on the benefit ... [more ▼]
BACKGROUND:: Infliximab (IFX) and adalimumab (ADA) are attractive treatment options in patients with inflammatory bowel disease (IBD) also during pregnancy but there is still limited data on the benefit/risk profile of IFX and ADA during pregnancy. METHODS:: This observational study assessed pregnancy outcomes in 212 women with IBD under antitumor necrosis factor alpha (TNF) treatment at our IBD unit. Pregnancy outcomes in 42 pregnancies with direct exposure to anti-TNF treatment (35 IFX, 7 ADA) were compared with that in 23 pregnancies prior to IBD diagnosis, 78 pregnancies before start of IFX, 53 pregnancies with indirect exposure to IFX, and 56 matched pregnancies in healthy women. RESULTS:: Thirty-two of the 42 pregnancies ended in live births with a median gestational age of 38 weeks (interquartile range [IQR] 37-39). There were seven premature deliveries, six children had low birth weight, and there was one stillbirth. One boy weighed 1640 g delivered at week 33, died at age of 13 days because of necrotizing enterocolitis. A total of eight abortions (one patient wish) occurred in seven women. Trisomy 18 was diagnosed in one fetus of a mother with CD at age 37 under ADA treatment (40 mg weekly) and pregnancy was terminated. Pregnancy outcomes after direct exposure to anti-TNF treatment were not different from those in pregnancies before anti-TNF treatment or with indirect exposure to anti-TNF treatment but outcomes were worse than in pregnancies before IBD diagnosis. CONCLUSIONS:: Direct exposure to anti-TNF treatment during pregnancy was not related to a higher incidence of adverse pregnancy outcomes than IBD overall. (Inflamm Bowel Dis 2011;). [less ▲]Detailed reference viewed: 55 (24 ULg)
Genetic variation in the autophagy gene ULK1 and risk of Crohn's disease
; ; et al
in Inflammatory Bowel Diseases (2011), 17(6), 1392-1397Detailed reference viewed: 23 (5 ULg)
Should patients under long-term anti-TNF therapies be followed for tuberculosis contamination?
Reenaers, Catherine ; Belaiche, Jacques ; Louis, Edouard
in Inflammatory Bowel Diseases (2010), 16(8), 1271-2Detailed reference viewed: 17 (3 ULg)
Familial aggregation and antimicrobial response dose-dependently affect the risk for Crohn's disease.
; Van Steen, Kristel ; et al
in Inflammatory Bowel Diseases (2010), 16(1), 58-67
BACKGROUND:: An increased risk of Crohn's disease (CD) has been reported consistently in first-degree relatives of patients. Our aim was to test whether a combination of CD-associated genes involved in ... [more ▼]
BACKGROUND:: An increased risk of Crohn's disease (CD) has been reported consistently in first-degree relatives of patients. Our aim was to test whether a combination of CD-associated genes involved in innate immunity and/or antibody responses to microbial antigens may be valuable in identifying healthy relatives at risk. METHODS:: We investigated 86 families from Belgium and northern France, 45 with at least 3 first-degree relatives with CD, 24 with a single case, and 17 control families without inflammatory bowel disease (IBD). The cohort consisted of 186 CD patients, 290 healthy relatives, and 142 controls (total 618). Genetic (NOD2, NOD1, TLR4, CARD8) and serologic markers (ASCA, ACMA, ALCA, ACCA, ASigmaMA, OmpC, CBir1, I2) were determined in all subjects. All Belgian families were prospectively followed up for 54 months. RESULTS:: In multiple-affected families, an increment of affected first-degree relatives and of positive antibodies were additive risks factors for CD (P < 0.0001), independent of NOD2 mutations. When comparing subjects from multiple-affected families, having 3 additional first-degree relatives with CD and 1 additional positive antibody increased the odds for CD to 9.19 (95% confidence interval [CI]: 4.07-20.80). After a follow-up of 54 months among all Belgian families, a total of 4 new diagnoses of IBD were confirmed in the multiple-affected families only, resulting in a 57-fold increase in incidence within multiple-affected families compared to the known incidence of IBD in our region. CONCLUSIONS:: We found an additive risk increment for CD in subjects from multicase families per additional affected relative and per additional positive antibody, independent of NOD2. Furthermore, a very high disease incidence was observed in these multiple-affected families. Inflamm Bowel Dis 2010. [less ▲]Detailed reference viewed: 29 (3 ULg)
Immunosuppressant combined with infliximab in Crohn's Disease: For 6 months, for 2 years, or forever?
in Inflammatory Bowel Diseases (2010)Detailed reference viewed: 12 (5 ULg)
Predictive value of epithelial gene expression profiles for response to infliximab in Crohn’s disease
; ; et al
in Inflammatory Bowel Diseases (2010), 16(12), 2090-2098Detailed reference viewed: 23 (7 ULg)
Mucosal Healing Predicts Long-term Outcome of Maintenance Therapy with Infliximab in Crohn's Disease
; ; et al
in Inflammatory Bowel Diseases (2009), 15(9), 1295-1301
Background: Infliximab (IFX) treatment induces mucosal healing (MH) in patients with Crohn's disease (CD) but the impact of MH oil the long-term outcome of IFX treatment in CID is still debated. Methods ... [more ▼]
Background: Infliximab (IFX) treatment induces mucosal healing (MH) in patients with Crohn's disease (CD) but the impact of MH oil the long-term outcome of IFX treatment in CID is still debated. Methods: We studied MH during long-term treatment with IFX in 214 CID patients. A total of 193 patients (85.5%) responded to induction therapy and 31 patients (14.5%) were primary nonresponders. They underwent lower gastrointestinal (GI) endoscopy within a median of 0.7 months (interquartile range [IQR] 0.1-6.9) prior to first IFX and after a median of 6.7 months (IQR 1.4-24.6) after start of IFX and were further analyzed. The relationship between the outcome of IFX treatment long-term and MH was studied. Results: MH was observed in 67.8% of the 183 initial responders (n = 124), with 83 patients having complete healing (45.4%) and 41 having partial healing (22.4%). Scheduled IFX treatment from the start resulted in MH more frequently (76.9% MH rate) than episodic treatment (61.0% MH rate; P = 0.0222, odds ratio [OR] 2.14, 95% confidence interval [CI] 1.11-4.12). Concomitant treatment with corticosteroids (CS) had a negative impact on MH (37.9% in patients with CS versus 63.2% in patients without CS; P = 0.021, OR 0.36, 95% CI 0.16-0.80). MH was associated with a significantly lower need for major abdominal surgery (MAS) during long-term follow-up (14.1% of patients with MH needed MAS versus 38.4% of patients Without MH: P < 0.0001). Conclusions: MH induced by long-term maintenance IFX treatment is associated with an improved long-term outcome of the I disease especially with a lower need for major abdominal surgeries. [less ▲]Detailed reference viewed: 27 (5 ULg)
Does the phenotype at diagnosis (e.g., fibrostenosing, inflammatory, perforating) predict the course of Crohn's disease?
Louis, Edouard ; Reenaers, Catherine ; Belaiche, Jacques
in Inflammatory Bowel Diseases (2008), 14Detailed reference viewed: 19 (2 ULg)
Does the behavior of Crohn's disease change over time?
Louis, Edouard ; Reenaers, Catherine ; Belaiche, Jacques
in Inflammatory Bowel Diseases (2008), 14Detailed reference viewed: 32 (7 ULg)
Assessment of endoscopic activity lndex and biological lnflammatory markers in clinically active Crohn's disease with normal C-reactive protein serum level
; Reenaers, Catherine ; et al
in Inflammatory Bowel Diseases (2007), 13(9), 1100-1105
Background: Patients with clinically active Crohn's disease (CD), defined by a Crohn's Disease Activity Index (CDAI) > 150, may have normal Greactive protein (CRP) serum levels. In such cases, it is ... [more ▼]
Background: Patients with clinically active Crohn's disease (CD), defined by a Crohn's Disease Activity Index (CDAI) > 150, may have normal Greactive protein (CRP) serum levels. In such cases, it is difficult to know whether these patients have really active disease or rather functional symptoms. This distinction is important to decide the most appropriate treatment. The aim of our work was to assess intestinal and colonic lesions in such patients and to look for biological markers potentially associated with endoscopic activity of the disease. Methods: We included 28 consecutive CD patients with CDAI >150 and a normal CRP level. These patients underwent a full colonoscopy with Crohn's Disease Endoscopy Index of Severity (CDEIS) calculation, fecal calprotectin, blood fibrinogen, acid a-I glycoprotein, and erythrocyte sedimentation rate measurement. The Harvey-Bradshaw score was also calculated. Serum ILI beta, IL6, IL8, sIL2R, and sTNFR2 were measured. Results: The median CDAI was 181 (151-485). Almost all (92.9%) these patients had endoscopic lesions, but the majority had only mild lesions (CDEIS : 6). No correlation was found between CDEIS and any of the clinical or biological markers. However, all the patients with significant endoscopic lesions (defined by a CDEIS >6) had previous surgical intestinal resection and lesions involving the anastomosis. Conclusions: Patients with elevated CDAT and normal CRP have only mild mucosal lesions of CD. Most significant lesions may be observed at the anastomosis and proximal to it in previously operated patients. None of the biological markers tested was associated with these endoscopic lesions. [less ▲]Detailed reference viewed: 29 (0 ULg)
Multicenter randomized-control led clinical trial of probiotics (Lactobacillus johnsonii, LA1) on early endoscopic recurrence of Crohn's disease after ileo-caecal resection
; ; Louis, Edouard et al
in Inflammatory Bowel Diseases (2007), 13(2), 135-142
Background: Seventy percent of Crohn's disease (CD) patients exhibit anastomotic recurrence within I year after ileo-caecal surgery, Recent clinical trials suggest the beneficial use of probiotics in the ... [more ▼]
Background: Seventy percent of Crohn's disease (CD) patients exhibit anastomotic recurrence within I year after ileo-caecal surgery, Recent clinical trials suggest the beneficial use of probiotics in the control of intestinal inflammation in pouchitis and ulcerative colitis. This study is a multicenter clinical trial evaluating the efficacy of an oral administration of the probiotic LA1 on early postoperative endoscopic recurrence of CD. Methods: Seventy patients with CD were enrolled prior to elective ileo-caecal resection and randomly assigned after surgery to daily treatment with either Lactobacillus johnsonii, LA1, Nestle (10(10) colony-forming units, CFU) (group A, n = 34) or placebo (group B, n = 36) for 12 weeks. The primary objective was to assess the effect of LA1 on the endoscopic recurrence rate at 12 weeks. Stratification was performed according to smoking status at randomization. Results: Seven and 14 patients were excluded in the LA1 and placebo groups, respectively. In intention-to-treat analysis, the mean endoscopic score was not significantly different between the two treatment groups at 3 months (LA1 versus placebo: 1.50 +/- 1.32 versus 1.22 +/- 1.37, treatment effect: P = 0.48, smoke effect: P = 0.72). The percentage of patients with severe recurrence (i3 + i4) was 21% and 15% in the LA1 and placebo groups, respectively (P = 0.33). Using a per-protocol (PP) analysis, the mean endoscopic score was not significantly different between the two treatment groups (LA1 versus placebo groups: 1.44 +/- 1.31 versus 1.05 +/- 1.21, P = 0.32). The percentage of patients with severe recurrence (i3 + i4) was 19% and 9% in the LA1 and placebo groups, respectively (P = 0.054). Clinical relapse rate (CDAI [CD activity index] > 150, with an increase of CDAI > 70 points or greater from baseline) in the LAI and placebo groups was 15% (4/27) and 13.5% (3/22), respectively (PP analysis: chi-square test, P = 0.91 and log-rank test: P = 0.79). Conclusion: Oral administration of the probiotic LA1 in patients with CID failed to prevent early endoscopic recurrence at 12 weeks after ileo-caecal resection. [less ▲]Detailed reference viewed: 30 (2 ULg)
Multidrug resistance gene-1 polymorphisms and resistance to cyclosporine a in patients with steroid resistant ulcerative colitis
; ; et al
in Inflammatory Bowel Diseases (2007), 13(1), 19-23
Background: Cyclosporine A (CsA) is inconstantly effective in inducing remission in acute attacks of ulcerative colitis (UC) not responding to steroids. This study aimed to establish whether multidrug ... [more ▼]
Background: Cyclosporine A (CsA) is inconstantly effective in inducing remission in acute attacks of ulcerative colitis (UC) not responding to steroids. This study aimed to establish whether multidrug resistance gene (MDR)1 polymorphisms would be associated with CsA failure. Patients and Methods: The distribution of the different genotypes of single nucleotide polymorphisms (SNP) G2677T/A and C3435T of MDR1 exons 21 and 26, respectively, was studied in 154 patients (mean age, 44 yr) who had received CsA to treat severe attacks of steroid resistant UC in 11 centers in France and Belgium. Patients were classified as CsA failure (n = 50) when they needed colectomy within 30 days after CsA initiation. The SNPs were detected by use of a 5' nuclease allelic discrimination assay. Results: There was a significant association between the G2677T/A polymorphism distribution (exon 21) and the risk for CsA failure (P = 0.0001). The TT genotype of exon 21 was significantly associated with the risk compared with the two other genotypes (odds ratio, 3.77; 95% confidence interval, 1.42-9.97, P = 0.007). There was no significant association between the genotype C3435T distribution (exon 26) and the risk of CsA failure (P = 0.23). Conclusion: The TT genotype of exon 21 MDR1 polymorphisms is associated with a higher risk of CsA failure in patients with steroid resistant UC. Further studies should be performed to establish whether other treatments could be more efficient to avoid surgery in this subset of patients. [less ▲]Detailed reference viewed: 17 (1 ULg)
Toll-like receptor-1,-2, and-6 polymorphisms influence disease extension in inflammatory bowel diseases
; ; Van Steen, Kristel et al
in Inflammatory Bowel Diseases (2006), 12(1), 1-8
Background: Evidence that a deficient innate immune response toward the bacterial flora of the gut plays a role in the pathogenesis of inflammatory bowel disease (IBD) is growing. This is underscored by ... [more ▼]
Background: Evidence that a deficient innate immune response toward the bacterial flora of the gut plays a role in the pathogenesis of inflammatory bowel disease (IBD) is growing. This is underscored by the finding of the association between CARD15 variants and Crohn's disease (CD) and D299G in Toll-like receptor (TLR) 4 and IBD. Our aims were to study nonsynonymous polymorphisms in other TLR genes in IBD. Methods: Thirty-five single nucleotide polymorphisms (SNP) in TLR1-10 were identified from public databases. 284 IBD parent child trios and a second independent cohort of 285 IBD patients and 191 healthy controls were genotyped with polymerase chain reaction-restriction fragment length polymorphisms. Patients were pooled for genotype-phenotype analyses. Results: Although none of the SNPs was involved in disease susceptibility, a number of variants influenced the disease phenotype. A positive association between TLR1 R80T and pancolitis in UC (P = .045, OR [95% CI] 2.844 [1.026-7.844]) was found. The TLR2 R753G SNP was also associated with pancolitis (P = .027, OR [95% CI] 4.741 [1.197-18.7731). The relative risks for heterozygous patients to develop pancolitis were 5.8 and 3.3 for R80T and R753G, respectively. There was a negative association between TLR6 S249P and ulcerative colitis with proctitis only (P = .026, OR [95% CI] 0.223 [0.096-0.705]). In CD, we found a negative association between ileal disease involvement and TLR1 S6021 (P = .03, OR [95% CI] 0.522 [0.286-0.950]). Conclusion: TLR2 and its cofactors TLR1 and TLR6 are involved in the initial immune response to bacteria by recognizing peptidoglycan. An association between nonsynonymous variants in the TLR1, -2, and -6 genes and extensive colonic disease in UC and CD was found. Our findings further highlight the role of an abnormal innate immune response in the pathogenesis of IBD. [less ▲]Detailed reference viewed: 11 (3 ULg)