Risk of lymphoma in inflammatory bowel disease

Primary Gastrointestinal EBV-Associated Classical Hodgkin Lymphoma in Crohn Disease on Anti-TNF-α Therapy: A Rare Association

Background

Lymphomas present a significant challenge in the field of gastrointestinal diseases, often being mistaken for other gastrointestinal tumors or inflammatory bowel disease conditions, causing clinical confusion. Early diagnosis plays a pivotal role in effective treatment. This case highlights the importance of recognizing lymphoproliferative disorders as a rare association of anti-tumor necrosis factor-α (TNF-α) therapy.

Case Presentation

A 41-year-old man with a 15-year history of Crohn disease on long-term therapy with adalimumab underwent a right hemicolectomy due to a semi-circumferential lesion at the ileocecal valve causing near complete obstruction and severe anemia (Hgb 6.4 g/dL). Previous biopsies of the mass showed an Epstein Barr Virus-positive (EBV+) classic Hodgkin lymphoma (CHL) in Crohn disease. At resection, the lymphoma showed transmural involvement of the ileum and regional lymph nodes.

Conclusion

Primary intestinal CHL comprises less than 5% of gastrointestinal lymphomas; CHL arising in the context of Crohn disease is even more rare. Most lymphomas associated with inflammatory bowel disease and/or immunosuppression are non-Hodgkin type. In this case, the long-term treatment with anti-TNF-α and EBV positivity suggested an iatrogenic immunodeficiency-associated lymphoma, an emerging group of lymphoproliferative disorders associated with the increased use of immunosuppressants.

Multimodality imaging features of small bowel cancers complicating Crohn's disease: a pictorial review

Patients with Crohn's disease (CD) are at increased risk of developing small bowel cancer, since chronic inflammation may trigger the histopathological sequence that begins from low-grade dysplasia of the intestinal epithelium and may eventually lead to malignant transformation. Owing to their location in a portion of the gastrointestinal tract which is not easily accessible to conventional endoscopic techniques, the detection of CD-related small bowel cancers is still a clinical challenge. The radiological features of CD-related small bowel adenocarcinoma (SBA) in patients with CD have been described in some previous studies, including its appearance in both CT and MRI examinations. Radiological signs of active or fibrostenotic CD may be intermixed with those suggesting the presence of CD-related SBA. In CT studies, the most relevant findings consistent with malignant transformation are the presence of a stricture with irregular asymmetric thickening of small bowel walls, loss of mural stratification, and moderate enhancement after intravenous administration of iodinated contrast media, in association with enlarged adjacent mesenteric lymph nodes. Many of the CD-related SBA features that can be observed on CT imaging are similar to those detectable by MRI. This latter modality provides the additional value of the functional characterization of small bowel strictures, thereby helping to distinguish between inflammatory, fibrotic, and malignant stenosis in the setting of active CD. Positron Emission Tomography (PET)/CT enables the metabolic assessment of enlarged mesenteric lymph nodes, and PET/MRI fusion imaging can incorporate morphological, functional and metabolic information into a single set of imaging data, thus overcoming the limitations of the separate assessment of each individual modality. Owing to the low incidence and prevalence of this long-term complication of CD, we believe that a detailed multimodality pictorial essay on this topic, also including the PET-CT and fusion imaging documentation of some cases, would be useful to the medical literature.

Lymphoma in Patients with Inflammatory Bowel Disease: A Multicentre Collaborative Study Between GETAID and LYSA

BACKGROUND

Inflammatory bowel disease [IBD] is associated with an increased risk of developing lymphoma. Although recent data have clarified the epidemiology of lymphoma in IBD patients, the clinical and pathological characteristics of lymphoma in IBD remain poorly known.

METHODS

Patients with IBD and lymphoma were retrospectively identified in the framework of a national collaborative study including the Groupe d'Étude Thérapeutique des Affections Inflammatoires du Tube Digestif [GETAID] and the Lymphoma Study Association [LYSA]. We characterized clinical and prognostic features for the three most frequent lymphoma subtypes occurring in IBD. We performed a multicentre case-control study. Controls [lymphoma de novo] were matched [5:1] to cases on gender, age at diagnosis, lymphoma subtype, year of diagnosis, and IPI/FLIPI indexes. Overall survival and progression-free survival were compared between cases and controls.

RESULTS

In total, 133 IBD patients with lymphoma were included [males = 62.4%, median age at lymphoma diagnosis = 49 years in males; 42 years in females]. Most had Crohn's disease [73.7%] and were exposed to thiopurines [59.4%]. The most frequent lymphoma subtypes were diffuse large B cell lymphoma [DLBCL, 45.1%], Hodgkin lymphoma [HL, 18.8%], and follicular lymphoma [FL, 10.5%]. When matched with 365 controls, prognosis was improved in IBD patients with DLBCL compared to controls [p = 0.0064, hazard ratio = 0.36] or similar [HL and FL].

CONCLUSIONS

Lymphomas occurring in IBD patients do not seem to have a worse outcome than in patients without IBD. Due to the rarity of this situation, such patients should be managed in expert centres.

The causal effect of inflammatory bowel disease on diffuse large B-cell lymphoma: two-sample Mendelian randomization study

Background

It has been reported that inflammatory bowel disease (IBD) is associated with an increased risk of malignancies, including lymphoma. A number of large observational studies have been devoted to exploring the causal link between IBD and malignant lymphoma. However, no consensus exists on whether there is a causal relationship between IBD and malignant lymphoma.

Methods

The summary dataset of the IBD and lymphoma genome-wide association studies (GWAS) was obtained from the OPEN GWAS website. Single-nucleotide polymorphisms (SNPs) were selected as genetic instrumental variants (IVs) for fulling P < 5 × 10-8 and linkage disequilibrium (LD) of r2 = 0.001 in the IBD GWAS. The proxy SNPs with LD of r2 > 0.8 were identified. Palindromic SNPs and outlier SNPs were excluded. The assessments of sensitivity employed the Cochran's Q test, Mendelian randomization (MR)-Egger intercept test, and leave-one-out analysis.

Results

The MR analysis results proved the causality of IBD on diffuse large B-cell lymphoma (DLBCL). The risk of developing DLBCL is increased by 28.6% in patients with IBD [odds ratio (OR)IVW = 1.286, 95% confidence interval (CI) 1.066-1.552, P = 0.009]. The results of the subgroup analysis showed that Crohn's disease (ORIVW = 1.218, 95% CI 1.030-1.441, P = 0.021) rather than ulcerative colitis (ORIVW = 1.206, 95% CI 0.984-1.478, P = 0.072) had a causal effect on DLBCL. No horizontal and directional pleiotropy was observed in the MR studies.

Conclusions

The above MR study concluded that IBD itself is causally responsible for DLBCL, especially Crohn's disease. Further investigations are needed to elucidate the mechanism underlying this direct causal link.

Incidence of lymphomas in inflammatory bowel disease: report of an emblematic case, systematic review, and meta-analysis

Introduction

Over the past 20 years, the increasing use of combined therapy with immunosuppressants and biologic agents has markedly reduced the use of steroids in the management of inflammatory bowel diseases (IBD). However, medical therapy seems to promote, in the long run, carcinogenesis resulting in an increased risk of developing different types of malignancies, including lymphomas. The aim of this study was to systematically review the current incidence and prognosis of lymphoid neoplasms occurring in patients with IBD.

Methods

Studies analyzing the incidence of lymphomas in subjects of age >18 years affected by IBD were included in this systematic review and meta-analysis. Studies focusing on pediatric populations, not reporting person-years of follow-up, or with a duration < 1 year were excluded. PubMed, Embase, Web of Science Core Collection, and Cochrane Central Register were searched from inception through January 2022. Publication bias within studies was assessed using Begg's and Egger's tests and random effects model. Quantitative results were synthesized using relative-risk meta-analysis. PRISMA guidelines were used to carry out this systematic review (PROSPERO Registration Number: CRD42023398348).

Results

A total of 345 studies published between 1985 and 2022, with a total of 6,17,386 patients were included in the meta-analysis. Substantial heterogeneity between studies prevented the pooling of estimates (I2 = 97.19%). Evidence of publication bias was overall low (p = 0.1941). Patients affected by Crohn's disease (CD) were 1,86,074 (30.13%), while 2,78,876 (46.17%) were diagnosed with UC. The remaining 23.7% of cases were diagnosed with indeterminate colitis. Immunomodulators and biologic therapy were used in 24,520 (5.27%), and 17,972 (3.86%) patients, respectively. Reported incidence rates for lymphoma in IBD ranged from 0.0/100,000 person/years (py) (95% CI 0.0-3.7/100,000) to 89/100,000 py (95% CI 36-160/100,000). Reported incidence rates of lymphoma in CD ranged from 0.0/100,000 py (95% CI 0.0-3.7/100,000) to 91/100,000 py (95% CI 18-164/100,000). For UC, the incidence rate ranged from 0.0/100,000 py (95% CI 0.0-3.7/100,000) to 95/100,000 py (95% CI 0-226/100,000). Male-to-female ratio was ~4:1. Therapy with immunomodulators was directly associated with an increased incidence of lymphoma (p < 0.0001). Evidence of publication bias was overall low (p = 0 .1941).

Conclusions

The evidence arising from this study highlights a correlation between the use of immunomodulators and subsequent lymphoma development. Combined multidisciplinary approach and long-term follow-up are warranted in order to decrease mortality deriving from the coexistence of both conditions.

Systematic review registration

Identifier: CRD42023398348.

Risk of malignant lymphomas in patients with inflammatory bowel disease: a population-based cohort study

OBJECTIVE

To estimate the risk of non-Hodgkin's lymphoma (NHL) and Hodgkin's lymphoma (HL) in patients with inflammatory bowel disease (IBD).

DESIGN

We undertook a two-country population cohort study with all patients diagnosed with IBD in Norway and Sweden from 1987 and 1993 through 2015 and 2016, respectively, and analysed the risk of NHL and HL. In Sweden, we also analysed prescriptions of thiopurines and anti-tumour necrosis factor (TNF)-α therapy from 2005. We calculated standardised incidence ratios (SIRs) with 95% CIs using the general populations as reference.

RESULTS

Among 131 492 patients with IBD with a medium follow-up of 9.6 years, we identified 369 cases of NHL and 44 cases of HL. The SIR of NHL was 1.3 (95% CI 1.1 to 1.5) in ulcerative colitis and 1.4 (95% CI 1.2 to 1.7) in Crohn's disease. We found no compelling heterogeneity in analyses stratified by patient characteristics. We found a similar pattern and magnitude of excess risks for HL. At 10 years, cumulative incidence was 0.26% (95% CI 0.23% to 0.30%) and 0.06% (95% CI 0.04% to 0.08%) for NHL and HL, respectively. Higher excess risks were found among patients with NHL with concomitant primary sclerosing cholangitis (SIR 3.4; 95% CI 2.1 to 5.2) and in those prescribed thiopurines alone (SIR 2.8; 95% CI 1.4 to 5.7) or with anti-TNF-α agents (SIR 5.7; 95% CI 2.7 to 11.9).

CONCLUSION

Patients with IBD have a statistically significant increased risk of malignant lymphomas compared with the general population, but the absolute risk remains low.

The Risk of Extraintestinal Cancer in Inflammatory Bowel Disease: A Systematic Review and Meta-analysis of Population-based Cohort Studies

BACKGROUND & AIMS

Patients with Crohn's disease (CD) and ulcerative colitis (UC) are at increased risk of developing intestinal cancer. However, less is known about the risk of extraintestinal cancers (EICs). The aim of this study was to conduct a systematic review and meta-analysis of population-based cohorts assessing the risk of EICs in inflammatory bowel disease (IBD) patients.

METHODS

Only population-based studies reporting on the prevalence or incidence of EICs were included. In total, 884 studies were screened and those included were assessed for quality. Eligible studies were pooled for length of follow-up evaluation, events in the IBD population, and events or expected events in a control population for the meta-analyses.

RESULTS

In total, 40 studies were included in the systematic review and 15 studies were included in the meta-analysis. The overall risk of EICs was found to be increased in both CD (incidence rate ratio [IRR]: 1.43 [CI, 1.26, 1.63]) and UC (IRR: 1.15 [1.02, 1.31]) patients. Both CD and UC patients presented with an increased risk of skin (IRR: CD, 2.22 [1.41-3.48]; UC, 1.38 [1.12-1.71]) and hepatobiliary (IRR: CD, 2.31 [1.25-4.28]; UC, 2.05 [1.52-2.76]) malignancies. Furthermore, CD patients showed an increased risk of hematologic (IRR, 2.40 [1.81-3.18]) and lung (IRR, 1.53 [1.23-1.91]) cancers. These increased risks were present despite treatment with immunosuppressives.

CONCLUSIONS

This systematic review and meta-analysis shows that both CD and UC patients are at an increased risk of developing EICs, both overall and at specific sites. However, additional studies with longer follow-up evaluation are needed to assess the true risk of EICs posed by IBD.

Characteristics of Lymphoma in Patients with Inflammatory Bowel Disease: A Systematic Review

BACKGROUND

Lymphoma is a dreaded complication of inflammatory bowel diseases [IBD]. Knowledge about lymphoma in patients with IBD is limited to epidemiological data and the description of risk factors. We performed a systematic review to describe the clinical characteristics and prognosis of lymphoma in patients with IBD.

METHODS

Electronic databases were searched up to June 1, 2020. All published clinical characteristics of lymphoma occurring in patients with IBD were collected.

RESULTS

Eleven studies were included. A total of 589 lymphomas were described in patients with IBD. As seen in de novo lymphoma, non-Hodgkin's lymphoma [NHL] was the most common histological subtype [83.9%]. Diffuse large B-cell lymphoma [DLBCL] and follicular lymphoma were the most well-represented NHL in patients with IBD [30% and 13% respectively]. Two main differences were observed in comparison with de novo lymphoma: primary intestinal lymphoma [PIL] represented a large proportion of lymphoma in patients with IBD [22-75%] whereas mucosa-associated lymphoid tissue [MALT] lymphoma was under-represented. Epstein-Barr virus [EBV]-positive status was observed in a large proportion of tumours [44-75%]. Survival data of lymphoma in patients with IBD were similar to those of de novo lymphoma.

DISCUSSION

This systematic review first highlights that PIL [especially DLBCL subtype] is significantly more frequent in patients with IBD and represents the most common entity. Conversely, MALT lymphoma is extremely rare in the IBD population. However, the overall quality of the evidence is low. Further studies are required to better define lymphoma characteristics in patients with IBD.

Clinically relevant thyroid disorders and inflammatory bowel disease are inversely related: a retrospective case-control study

OBJECTIVES

The risk of thyroid disorders (TDs) in inflammatory bowel disease (IBD) is still controversial. The aim of this retrospective, single-center, case-control study was to explore the association between clinically relevant functional TDs and IBD.

METHODS

Consecutive individuals for a total of 313 IBD patients [90 Crohn's disease (CD); 223 ulcerative colitis (UC)], and 833 individuals undergoing colonoscopy for screening without IBD were collected. In the study, subject's information on thyroid status were retrieved. Thyroid disorders were classified, according to the functional status, as hypothyroidism or hyperthyroidism. Patients with TDs (cases) were compared with 941 without (controls) according to IBD exposure. Unadjusted and adjusted odds ratios (ORs) and their 95% confidence interval (CI) were calculated.

RESULTS

Clinically relevant TDs were detected in 205 (17,9%) patients and the prevalence was significantly lower in IBD patients compared with subjects without (8.3% vs 12.9%; p = 0.029). After adjusting for potential confounders, a higher TDs risk was confirmed in female (OR 2.72; 95%CI 1.88‒3.92) and older subjects (OR 1.01; 95%CI 1.00‒1.03), and a lower risk in IBD (OR 0.51; 95%CI 0.34‒0.76), especially for hypothyroidism (OR 0.33; 95%CI 0.17‒0.66) in UC. Among four thyroid cancers, only one was detected in IBD patients.

CONCLUSIONS

Overall, in our study, the risk of TDs was lower in IBD patients. To assess routinely hormones and/or thyroid gland imaging in the absence of clinical signs or symptoms seems unnecessary in IBD patients, at least in our geographic area.

An unusual case of diffuse large B-cell lymphoma complicating a Crohn's disease

Clinicians should keep in mind that Crohn's disease may be complicated by neoplasia such as adenocarcinomas or lymphomas, especially if the disease duration is long and the patient is under immunosuppressive therapy.

Prognosis of Lymphoma in Patients With Known Inflammatory Bowel Disease: A French Multicentre Cohort Study

BACKGROUND AND AIMS

The prognosis of lymphoma that occurs in patients with inflammatory bowel disease [IBD] is poorly known.

METHODS

A multicentre retrospective cohort analysis was done in seven French tertiary centres from 1999 to 2019. Only lymphoma occurring in patients with previous established diagnosis of IBD were analysed. The primary outcome was progression-free survival at 3 years.

RESULTS

A total of 52 patients [male 65%, Crohn's disease 79%, median age 48.3 years, median duration of IBD 10.1 years] were included, of whom 37 had been previously exposed to immunosuppressants and/or biologics for at least 3 months and 20 had primary intestinal lymphomas. The lymphoma histological types were: diffuse large B cell lymphomas [N = 17], Hodgkin lymphomas [N = 17], indolent B cell lymphomas [N = 12], and others including T cell lymphomas, mantle cell lymphomas, and unclassifiable B cell lymphoma [N = 6]. The median follow-up after lymphoma was 5.1 years (interquartile range [IQR] 4-7.8). Progression-free survival at 3 years was 85% in the overall population (95% confidence interval [CI] 75%-96%) with no significant difference between the exposed and unexposed group, 79% for patients exposed to immunosuppressants and/or biologics [95% CI 67%-94%], and 83% for patients diagnosed with primary intestinal lymphoma [95% CI 67%-100%]. No relapse of IBD has been observed during chemotherapy. The IBD relapse rate at the end of the last chemotherapy cycle was 23% at 3 years [95% CI 11%-39%] in the overall population.

CONCLUSIONS

In this large cohort, the prognosis for lymphomas occurring in IBD appears to be good and similar to what is expected, irrespective of the exposure to biologics and/or immunosuppressants.

Primary small bowel lymphoma presenting as invagination

One of the causes of invagination in adults is primary small bowel lymphoma. Primary small bowel lymphomas are rare, present themselves with complications due to diagnostic difficulties, and are diagnosed only after surgical intervention. In case of invagination, one of the complications of these tumors, namely primary small bowel lymphoma, should also be considered as a cause in the diagnosis. In this paper, the diagnosis and therapy of a rare case of primary polypoid-type small intestinal lymphoma demonstrating findings of obstruction due to invagination have been presented and discussed in the light of the literature.

Incidence of Colorectal Cancer and Extracolonic Cancers in Veteran Patients With Inflammatory Bowel Disease

Background

The risk for colorectal cancer (CRC) and certain extracolonic cancers is thought to be increased in inflammatory bowel disease (IBD), but few recent US studies have evaluated this issue. We aimed to estimate the incidence of CRC and extracolonic cancers in IBD patients.

Methods

In this case-control study, cases were all IBD patients treated in our Department of Veterans Affairs (VA) hospital who developed CRC or extracolonic cancers between 1996 and 2015. Controls were patients in the general VA population who developed these cancers during the same time. We compared cancer incidence rates (IRs) in cases and controls.

Results

There was no significant difference between cases and controls in the 20-year IR for CRC (148/100 000 in IBD patients, 97/100 000 in controls; relative risk [RR], 1.53; 95% confidence interval [CI], 0.86-2.69). In contrast, IBD cases had a significantly higher 20-year IR for all extracolonic cancers than controls (2839/100 000 in IBD patients, 1960/100 000 in controls; RR, 1.45; 95% CI, 1.27-1.65). Site-specific analyses revealed that IBD patients had significantly elevated risks for nonmelanoma skin cancers (RR, 2.38; 95% CI, 1.99-2.85), melanoma skin cancers (RR, 2.85; 95% CI, 1.63-4.88), renal tumors (RR, 2.90; 95% CI, 1.46-5.84), prostate cancer (RR, 1.70; 95% CI, 1.28-2.27), and pancreatic cancer (RR, 4.23; 95% CI, 1.35-13.29).

Conclusions

The incidence of CRC was not significantly higher in our veteran patients with IBD than in control patients in the general VA population. In contrast, our IBD patients had a significantly higher risk for extracolonic cancers than controls, including cancers of the skin, kidneys, prostate, and pancreas. 10.1093/ibd/izx046_video1Video 1.izx046_Mosher_Video5734484616001.

Extracolonic Cancer in Inflammatory Bowel Disease: Data from the GETECCU Eneida Registry

OBJECTIVES

The objective of this study was (a) To know the prevalence and distribution of extracolonic cancer (EC) in patients with inflammatory bowel disease (IBD); (b) To estimate the incidence rate of EC; (c) To evaluate the association between EC and treatment with immunosuppressants and anti-tumor necrosis factor (TNF) agents.

METHODS

This was an observational cohort study.

INCLUSION CRITERIA

IBD and inclusion in the ENEIDA Project (a prospectively maintained registry) from GETECCU.

EXCLUSION CRITERIA

Patients with EC before the diagnosis of IBD, lack of relevant data for this study, and previous treatment with immunosuppressants other than corticosteroids, thiopurines, methotrexate, or anti-TNF agents. The Kaplan-Meier method was used to evaluate the impact of several variables on the risk of EC, and any differences between survival curves were evaluated using the log-rank test. Stepwise multivariate Cox regression analysis was used to investigate factors potentially associated with the development of EC, including drugs for the treatment of IBD, during follow-up.

RESULTS

A total of 11,011 patients met the inclusion criteria and were followed for a median of 98 months. Forty-eight percent of patients (5,303) had been exposed to immunosuppressants or anti-TNF drugs, 45.8% had been exposed to thiopurines, 4.7% to methotrexate, and 21.6% to anti-TNF drugs. The prevalence of EC was 3.6%. In the multivariate analysis, age (HR=1.05, 95% CI=1.04-1.06) and having smoked (hazards ratio (HR)=1.47, 95% confidence interval (CI)=1.10-1.80) were the only variables associated with a higher risk of EC.

CONCLUSIONS

Neither immunosuppressants nor anti-TNF drugs seem to increase the risk of EC. Older age and smoking were associated with a higher prevalence of EC.

Safety of treatments for inflammatory bowel disease: Clinical practice guidelines of the Italian Group for the Study of Inflammatory Bowel Disease (IG-IBD)

Inflammatory bowel diseases are chronic conditions of unknown etiology, showing a growing incidence and prevalence in several countries, including Italy. Although the etiology of Crohn's disease and ulcerative colitis is unknown, due to the current knowledge regarding their pathogenesis, effective treatment strategies have been developed. Several guidelines are available regarding the efficacy and safety of available drug treatments for inflammatory bowel diseases. Nevertheless, national guidelines provide additional information adapted to local feasibility, costs and legal issues related to the use of the same drugs. These observations prompted the Italian Group for the Study of Inflammatory Bowel Disease (IG-IBD) to establish Italian guidelines on the safety of currently available treatments for Crohn's disease and ulcerative colitis. These guidelines discuss the use of aminosalicylates, systemic and low bioavailability corticosteroids, antibiotics (metronidazole, ciprofloxacin, rifaximin), thiopurines, methotrexate, cyclosporine A, TNFα antagonists, vedolizumab, and combination therapies. These guidelines are based on current knowledge derived from evidence-based medicine coupled with clinical experience of a national working group.

A population-based study examining the risk of malignancy in patients diagnosed with inflammatory bowel disease

BACKGROUND

Recent studies suggest an increased risk of malignancy in patients with inflammatory bowel disease (IBD), although the findings were inconsistent. We used data from the clinical practice research datalink (CPRD) to further examine this association.

METHODS

Patients with a first-time diagnosis of IBD were randomly matched to an equally sized IBD-free comparison group. Multivariable adjusted hazard ratios (AHRs) for cancer risk were estimated using Cox's proportional hazard regression. A nested case-control analysis comprising IBD patients only was then conducted using conditional logistic regression to estimate the risk of cancer development according to IBD severity, disease duration and IBD therapy.

RESULTS

We identified 1077 cancers among 39,294 IBD or IBD-free patients followed between 1995 and 2012. There was no association between IBD and overall risk of cancer [AHR 1.11, 95 % confidence interval (CI) 0.98-1.25], but a borderline increase in the risk of lymphoproliferative malignancies was observed in patients with IBD (AHR 1.49, 95 % CI 1.00-2.23). Aminosalicylate use was significantly associated with reduced risk of all cancers [adjusted odds ratio (AOR), 0.72, 95 % CI 0.54-0.96], of intestinal cancer (AOR 0.33, 95 % 0.12-0.89) and of prostate cancer (AOR 0.32, 95 % 0.13-0.80).

CONCLUSIONS

There was no increased risk of cancer overall in individuals with IBD compared to IBD-free individuals. Consistent with previous findings, a reduction in cancer risk was observed in IBD patients using aminosalicylates, with a substantial reduction in prostate cancer risk. Further large-scale studies examining the relationship between IBD therapy and cancer risk appear to be warranted.

Worldwide Incidence of Colorectal Cancer, Leukemia, and Lymphoma in Inflammatory Bowel Disease: An Updated Systematic Review and Meta-Analysis

Background/Aims. Inflammatory bowel disease (IBD) is associated with an increased risk of colorectal cancer (CRC). In addition, there may be an association between leukemia and lymphoma and IBD. We conducted a systematic review and meta-analysis of the IBD literature to estimate the incidence of CRC, leukemia, and lymphoma in adult IBD patients. Methods. Studies were identified by a literature search of PubMed, Cochrane Library, Medline, Web of Science, Scopus, EMBASE, and ProQuest Dissertations and Theses. Pooled incidence rates (per 100,000 person-years [py]) were calculated through use of a random effects model, unless substantial heterogeneity prevented pooling of estimates. Several stratified analyses and metaregression were performed to explore potential study heterogeneity and bias. Results. Thirty-six articles fulfilled the inclusion criteria. For CRC, the pooled incidence rate in CD was 53.3/100,000 py (95% CI 46.3–60.3/100,000). The incidence of leukemia was 1.5/100,000 py (95% CI −0.06–3.0/100,000) in IBD, 0.3/100,000 py (95% CI −1.0–1.6/100,000) in CD, and 13.0/100,000 py (95% CI 5.8–20.3/100,000) in UC. For lymphoma, the pooled incidence rate in CD was 0.8/100,000 py (95% CI −0.4–2.1/100,000). Substantial heterogeneity prevented the pooling of other incidence estimates. Conclusion. The incidence of CRC, leukemia, and lymphoma in IBD is low.

Who and how to screen for cancer in at-risk inflammatory bowel disease patients

Inflammatory bowel diseases (IBDs) include both Crohn's disease and ulcerative colitis and both diseases are marked by inflammation within the gastrointestinal tract. Due to long-standing inflammation, IBD patients are at increased risk of colorectal cancer, especially patients with chronic inflammation, pancolitis, co-diagnosis of primary sclerosing cholangitis and a longer duration of disease. Small bowel inflammation places Crohn's patients at an increased risk of small bowel cancer. A higher risk of skin cancers, lymphomas and cervical abnormalities is also seen in IBD patients; this is likely related to both disease factors and the presence of immunosuppressive medication. This article reviews which patients are at an increased risk of IBD-associated or IBD treatment-associated cancers, when to begin screening and which screening methods are recommended.

Risk and clinical characteristics of lymphoma in Korean patients with inflammatory bowel diseases: a multicenter study

BACKGROUND AND AIMS

Studies of lymphoma risk in Western inflammatory bowel disease (IBD) patients show conflicting results; however, none have examined the lymphoma risk and clinical characteristics of Asian IBD patients.

METHODS

Patients with lymphoma were identified in an IBD database from 3 tertiary referral centers in Seoul, Korea. The standardized incidence ratio (SIR) of lymphoma was estimated using data from the Korea Central Cancer Registry of the National Cancer Center. The risk of lymphoma in relation to specific medications was also explored.

RESULTS

Seven cases of lymphoma (0.1%) were identified in 6585 IBD patients. The median age at lymphoma diagnosis was 43 years (range, 33 to 70 y) and the median duration of IBD at lymphoma diagnosis was 96.1 months (range, 15.1 to 171.6 mo). Three patients had underlying ulcerative colitis and 4 had Crohn's disease (CD). Non-Hodgkin lymphoma was diagnosed in 5 patients (71.4%) and Hodgkin disease (HD) in 2 patients (28.6%). The SIR of lymphoma was 2.03 [95% confidence interval (CI), 0.81-4.18] in the entire IBD patients. Both the SIR of lymphoma in CD patients (9.31; 95% CI, 1.13-33.62) and the SIR of HD (13.16; 95% CI, 1.59-47.53) in IBD patients were increased. The SIR of lymphoma in patients who were exposed to thiopurines was 5.93 (95% CI, 1.61-15.18).

CONCLUSIONS

The risk of lymphoma in CD patients and the risk of HD in IBD patients seem to be increased in Korea. Thiopurine may be related with the risk of lymphoma in Korean IBD patients.

Hematologic malignancies in the Japanese patients with inflammatory bowel disease

BACKGROUND

Although attention has been focused for over 20 years on the possible increased risk for hematologic malignancies (HM) in patients with inflammatory bowel diseases (IBD) receiving immune-modulators or anti-TNF-alpha antibodies, the association is still controversial. To understand the actual conditions of HM in the Japanese patients with IBD, the research committee for IBD supported by the Ministry of Health, Welfare and Labor of Japan (IBD-MHWL) conducted a multi-center retrospective study.

METHODS

Questionnaires for the development of HM in IBD patients were sent to the 70 facilities participating with IBD-MHWL in the first survey, followed by the second survey using a more detailed questionnaire, sent to the 27 members with HM patients.

RESULTS

Out of a total of 36,939 IBD patients in 70 facilities, 28 cases of HM related with IBD [12 of 10,500 UC patients (0.11 %), 16 of 6,310 CD patients (0.25 %)] were analyzed. The numbers of UC patients who developed HM were 2 (0.15 %) from the group receiving and 10 (0.13 %) from the group non-receiving thiopurine, without significant differences. The numbers of CD patients who developed HM were 4 (0.39 %) from the group receiving and 12 (0.21 %) from the group non-receiving thiopurine, without significant differences. The odds ratios of developing HM by thiopurine were 1.37 (95 % CI 0.30-6.24) in UC patients and 1.86 (95 % CI 0.60-5.78) in CD patients.

CONCLUSIONS

Our results suggested that thiopurine therapy may not be a risk factor for HM in Japanese patients with IBD. Further accumulation of cases and prospective studies are necessary to conclude this important issue.

Risk of cancer in patients with inflammatory bowel diseases: a nationwide population-based cohort study with 30 years of follow-up evaluation

BACKGROUND & AIMS

Data regarding the risk of gastrointestinal and extraintestinal cancers in Crohn's disease (CD) and ulcerative colitis (UC) are needed to understand the clinical course of inflammatory bowel diseases (IBDs) and their treatments.

METHODS

We performed a nationwide historical cohort study using Danish health care databases. We identified patients with a diagnosis of CD or UC, recorded from 1978 through 2010, and followed them up until the first occurrence of cancer, death, or emigration. We used standardized incidence ratios (SIRs) to compare cancer incidence in CD and UC patients with that expected in the general population.

RESULTS

Excluding cancers diagnosed within 1 year of IBD diagnosis, 772 cases of invasive cancer occurred among 13,756 patients with CD (SIR, 1.3; 95% confidence interval [CI], 1.2-1.4) and 2331 occurred among 35,152 patients with UC (SIR, 1.1; 95% CI, 1.0-1.1). CD was associated weakly with gastrointestinal cancers (SIR, 1.2; 95% CI, 1.0-1.4) and extraintestinal cancers (SIR, 1.3; 95% CI, 1.2-1.4), with the strongest associations for hematologic malignancies (SIR, 1.9; 95% CI, 1.5-2.3), smoking-related cancers (SIR, 1.5; 95% CI, 1.3-1.8), and melanoma (SIR, 1.4; 95% CI, 1.0-1.9). Associations between UC and gastrointestinal and extraintestinal cancers were weaker (SIR, 1.1; 95% CI, 1.0-1.2; and SIR, 1.1; 95% CI, 1.0-1.1, respectively). The relative risk of extraintestinal cancers among patients with IBD was relatively stable over time, although the risk of gastrointestinal cancers decreased.

CONCLUSIONS

Patients with IBD, particularly CD, are at increased risk for gastrointestinal and extraintestinal malignancies. The relative risk of gastrointestinal malignancy has decreased since 1978, without a concomitant increase in the risk of nongastrointestinal malignancy.

Extra-intestinal malignancies in inflammatory bowel disease: results of the 3rd ECCO Pathogenesis Scientific Workshop (III)

The incidence of lymphoproliferative disorders (LD) is increasing in developed countries. Patients with inflammatory bowel disease (IBD) exposed to thiopurines are at additional risk of three specific forms of LD: Epstein-Barr-Virus-related post-transplant like LD, hepato-splenic T-cell lymphoma and post-mononucleosis lymphoproliferation. The risk of the two latter forms of LD can be reduced when considering specific immunosuppressive strategies in young males. It is still unclear whether the risk of uterine cervix abnormalities is increased in IBD women, irrespective of the use of immunosuppressants. Given the excess risk demonstrated in various other contexts of immunosuppression, it is currently recommended that all women with IBD, particularly those receiving immunosuppressants, strictly adhere to a screening program of cervical surveillance and undergo vaccination against HPV, when appropriate. Patients with IBD receiving immunosuppressants are at increased risk of skin cancers. The risk of non-melanoma skin cancer is notably increased in patients receiving thiopurines. Recent data suggest that the risk of melanoma is mildly increased in patients exposed to anti-TNF therapy. All IBD patients should adhere to a program of sun protection and dermatological surveillance, whose details should take into account the other non-IBD-related risk factors.

Infectious and malignant complications of TNF inhibitor therapy in IBD

Tumor necrosis factor (TNF) inhibitors are being increasingly utilized in the management of inflammatory bowel disease (IBD). Although the benefits associated with TNF inhibitor therapy are undeniable, concerns have been raised about the associated risk of infectious and malignant complications. In this narrative review, we will present the evidence from studies that have evaluated the association of TNF inhibitors and both overall and specific infections and malignancy. Overall, although TNF inhibitors may increase the risk of tuberculosis, varicella, and other opportunistic infections, there is little evidence suggesting that anti-TNF agents specifically raise the overall risk of serious infections. Similarly, there is little evidence that TNF antagonists raise the risk of developing malignancy over and above the risks from concomitant therapies and the underlying disease process. However, the risk of nonmelanoma skin cancers may be increased and that is further enhanced by use of combination TNF inhibitor and thiopurine therapy. The risk of non-Hodgkin's lymphoma is statistically increased among combination therapy users. The absolute risk remains a very small but feared risk. It is difficult to fully quantify the risk of these cancers among users of TNF inhibitor therapy in the absence of concurrent thiopurine therapy. We recommend that clinicians remain mindful about the potential risks of infectious and malignant complications in their IBD patients who are using TNF inhibitors, but that further research is required to better study these risks over the long-term course of therapy.

Lymphoma misdiagnosed as Crohn's disease in a patient with a family history of Crohn's disease

Gastrointestinal lymphomas can be easily misdiagnosed due to the lack of specific clinical manifestations and accessory examinations that can differentiate them from other diseases. Here we report a case of gastrointestinal lymphoma that was misdiagnosed as Crohn's disease in a patient with a family history of Crohn's disease. He was finally diagnosed with lymphoma by ultrasound-guided biopsy.

Risk of lymphoma in patients with ulcerative colitis treated with thiopurines: a nationwide retrospective cohort study

BACKGROUND & AIMS

There is controversy over whether the treatment of patients with ulcerative colitis (UC) with thiopurines increases their risk of lymphoma. We evaluated the risk of lymphoma (ongoing, residual, and per year of therapy) among thiopurine-treated patients with UC.

METHODS

We obtained nationwide data from the Veterans Affairs (VA) health care system from 2001 to 2011. We performed a retrospective cohort study, analyzing data on 36,891 patients from their date of diagnosis of UC in the VA health care system to a diagnosis of lymphoma or October 1, 2011 (subjects followed up for a median of 6.7 years). Thiopurine exposure was assessed using the VA pharmacy database. Patients who developed lymphoma were identified based on ICD-9 codes and confirmed by manual chart review.

RESULTS

In total, 4734 patients with UC (13%) were treated with thiopurines for a median of 1 year. Lymphoma developed in 119 patients who had not been treated with thiopurines, 18 who were treated with thiopurines, and 5 who had discontinued treatment with thiopurines. The incidence rates of lymphoma were 0.60 per 1000 person-years among patients who had not been treated with thiopurines, 2.31 among patients who were treated with thiopurines, and 0.28 among patients who had discontinued treatment with thiopurines. The incidence rates of lymphoma during the first year, second year, third year, fourth year, and >4 years of thiopurine therapy were 0.9, 1.6, 1.6, 5, and 8.9 per 1000 person-years, respectively. The age-, sex-, and race-adjusted hazard ratios of developing lymphoma were 4.2 (95% confidence interval, 2.5-6.8; P < .0001) while being treated with thiopurines and 0.5 (95% confidence interval, 0.2-1.3; P = .17) after discontinuing treatment with thiopurines compared with patients who had not been treated with thiopurines.

CONCLUSIONS

Based on a retrospective, nationwide cohort study, patients with UC have a 4-fold increase in risk of lymphoma while being treated with thiopurines compared with patients who have not been treated with thiopurines. The risk increases gradually for successive years of therapy. Discontinuing thiopurine therapy reduces the risk of lymphoma.

Thiopurines related malignancies in inflammatory bowel disease: local experience in Granada, Spain

AIM

To investigate the incidence of neoplasms in inflammatory bowel disease (IBD) patients and the potential causative role of thiopurines.

METHODS

We performed an observational descriptive study comparing the incidence of malignancies in IBD patients treated with thiopurines and patients not treated with these drugs. We included 812 patients which were divided in two groups depending on whether they have received thiopurines or not. We have studied basal characteristics of both groups (age when the disease was diagnosed, sex, type of IBD, etc.) and treatments received (Azathioprine, mercaptopurine, infliximab, adalimumab or other immunomodulators), as well as neoplasms incidence. Univariate analysis was performed with the student t test, χ(2) test or Wilcoxon exact test as appropriate. A logistic regression analysis was performed as multivariate analysis. Statistical significance was establish at P values of less than 0.05, and 95%CI were used for the odds ratios.

RESULTS

Among 812 patients included, 429 (52.83%) have received thiopurines: 79.5% azathioprine, 14% mercaptopurine and 6.5% both drugs. 44.76% of patients treated with thiopurines and 46, 48% of patients who did not receive this treatment were women (P > 0.05). The proportion of ulcerative colitis patients treated with thiopurines was 30.3% compare to 66. 67% of patients not treated (P < 0.001). Mean azathioprine dose was 123.79 ± 36.5 mg/d (range: 50-250 mg/d), mean usage time was 72.16 ± 55.7 mo (range: 1-300 mo) and the accumulated dose along this time was 274.32 ± 233.5 g (1.5-1350 g). With respect to mercaptopurine, mean dose was 74.7 ± 23.9 mg/d (range: 25-150 mg/d), mean usage time of 23.37 ± 27.6 mo (range: 1-118 mo), and the accumulated dose along this time was 52.2 ± 63.5 g (range: 1.5-243 g). Thiopurine S-methyltransferase activity was tested in 66% of patients treated with thiopurines, among which 98.2% had an intermediate or high activity. Among the patients treated with thiopurines, 27.27% (112 patients) and 11.66% (50 patients) received treatment with Infliximab and Adalimumab respectively, but only 1.83% (7 patients) and 0.78% (3 patients) received these drugs in the group of patients who did not received thiopurines (P < 0.001 and P < 0.001 respectively). Finally, 6.8% (29 patients) among those treated with thiopurines have received other immunosuppressants (Methotrexate, Tacrolimus, Cyclosporin), compare to 1% (4 patients) of patients not treated with thiopurines (P < 0.001). Among patients treated with thiopurines, 3.97% developed a malignancy, and among those not treated neoplasms presented in 8.1% (P = 0.013). The most frequent neoplasms were colorectal ones (12 cases in patients not treated with thiopurines but none in treated, P < 0.001) followed by non-melanoma skin cancer (8 patients in treated with thiopurines and 6 in not treated, P > 0.05).

CONCLUSION

In our experience, thiopurine therapy did not increase malignancies development in IBD patients, and was an effective and safe treatment for these diseases.

The risk of lymphoma and immunomodulators in patients with inflammatory bowel diseases: results from a population-based cohort in Eastern Europe

BACKGROUND AND AIMS

Prior studies suggest a small but significantly increased risk of lymphoma in adults with inflammatory bowel disease (IBD), especially in patients treated with thiopurines. No data was available from Eastern Europe. The aim of this study was to analyze the incidence of lymphomas as related to drug exposure, in a population-based Veszprem province database, which included incident cases diagnosed between January 1, 1977 and December 31, 2008.

METHODS

Data from 1420 incident patients were analyzed (UC: 914, age at diagnosis: 36.5 years; CD: 506, age at diagnosis: 28.5.5 years). Both in- and outpatient records were collected and comprehensively reviewed. The rate of lymphoma was calculated as patient-years of exposure per medication class, of medications utilized in IBD.

RESULTS

Of the 1420 patients, we identified three patients who developed lymphoma (one CLL, two low-grade B-cell NHL including one rectal case), during 19,293 patient-years of follow-up (median follow-up: 13 years). All three patients were male. None had received azathioprine or biologicals. The absolute incidence rate of lymphoma was 1.55 per 10,000 patient-years, with 3 cases observed vs. 2.18 expected, with a standardized incidence ratio (SIR) of 1.37 (95% confidence interval [CI]: 0.44-4.26). No cases have been exposed to either azathioprine or biologicals.

CONCLUSIONS

The overall risk of lymphoma in IBD was not increased; only three cases were seen in this population-based incident cohort over a 30-year period. An association with thiopurine exposure was not found.

INTESTINAL AND EXTRAINTESTINAL NEOPLASIA IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE IN A TERTIARY CARE HOSPITAL

Context The development of neoplasia is an important concern associated with inflammatory bowel disease (IBD), especially colorectal cancer (CRC). Objectives Our aim was to determine the incidence of intestinal and extraintestinal neoplasias among patients with inflammatory bowel disease. Methods There were retrieved information from 1607 patients regarding demographics, disease duration and extent, temporal relationship between IBD diagnosis and neoplasia, clinical outcomes and risk factors for neoplasia. Results Crohn's disease (CD) was more frequent among women (P = 0.0018). The incidence of neoplasia was higher in ulcerative colitis (UC) when compared to CD (P = 0.0003). Eight (0.99%) patients developed neoplasia among 804 with CD: 4 colorectal cancer, 2 lymphomas, 1 appendix carcinoid and 1 breast cancer. Thirty (3.7%) patients developed neoplasia among the 803 UC: 13 CRC, 2 lymphomas and 15 extraintestinal tumors. While CRC incidence was not different among UC and CD (1.7% vs 0.5%; P = 0.2953), the incidence of extraintestinal neoplasias was higher among UC (2.1% vs 0.5%, P = 0.0009). Ten (26.3%) patients out of 38 with neoplasia died. Conclusions CRC incidence was low and similar in both diseases. There was a higher incidence of extraintestinal neoplasia in UC when compared to CD. Neoplasias in IBD developed at a younger age than expected for the general population. Mortality associated with malignancy is significant, affecting 1/4 of the patients with neoplasia.

Thiopurines in inflammatory bowel disease revisited

Although a great variety of new drugs have been introduced for the therapy of inflammatory bowel diseases so far, a definite cure of the disease is still out of scope. An anti-inflammatory approach to induce remission followed by maintenance therapy with immunosupressants is still the mainstay of therapy. Thiopurines comprising azathioprine and its active metabolite mercaptopurine as well as tioguanine, are widely used in the therapy of chronic active inflammatory bowel disease (IBD). Their steroid sparing potential and efficacy in remission maintenance are out of doubt. Unfortunately, untoward adverse events are frequently observed and may preclude further administration or be life threatening. This review will focus on new aspects of thiopurine therapy in IBD, its efficacy and safety.

Lymphoma and other lymphoproliferative disorders in inflammatory bowel disease: a review

The lymphoproliferative disorders (LDs) are a heterogeneous group of at least 70 conditions that result from the clonal proliferation of B, T, and NK cells. Inflammatory bowel disease (IBD)-associated lymphomas are typically B-cell LD, while T-cell or Hodgkin's lymphomas are rare. In IBD patients not on immunosuppression, the risk of LD seems to be similar or slightly higher than the background population risk. Thiopurine therapy is associated with an increased risk: the relative risk is increased four- to sixfold and the absolute risk varies between 1 in 4000-5000 for those aged 20-29 to 1 in 300-400 in those over 70. It is difficult to quantify the risk of anti- tumor necrosis factor (TNF) therapy alone; however, it appears to be less than for thiopurines alone. There is particular concern regarding the development of post-transplant-like LD in those with latent epstein-barr virus (EBV) infection exposed to immunosuppressives, the occurrence of hepatosplenic T cell lymphoma in patients treated with combination anti-TNF and thiopurine therapy, and the development of hemophagocytic lymphohistiocytosis in those who acquire a primary EBV or other infections while on immunosuppressive medication. There are currently no guidelines for monitoring EBV (or other virus) status in patients on immunosuppression, although it could be used to monitor those who have a prior history of lymphoma and are about to start a thiopurine or anti-TNF agent. In discussing the risks of lymphoproliferative disorders associated with agents used for the treatment of IBD, patients can often be reassured that the benefits of such therapy still outweigh the small, but real, risks.

Managing risks of neoplasia in inflammatory bowel disease

Inflammatory bowel disease (IBD) has been linked with a variety of intestinal and extraintestinal cancers. This review summarizes the latest literature with regard to which cancers are truly linked with IBD and which are not, the absolute and relative risks of these cancers, how medications commonly prescribed for IBD affect this risk, and finally strategies for managing these risks. Physicians and health professionals may find this information useful for counseling and educating patients as well as for improving patient care.

Lymphoma in inflammatory bowel disease and treatment decisions

The risk of lymphoma, particularly non-Hodgkin's lymphoma, is an important concern associated with therapy for inflammatory bowel disease (IBD). Lymphoma risks have been described for nearly all immunomodulatory therapies for IBD, and it is therefore important to have discussions with patients before initiating therapy. However, it is also important to put risks into contexts that IBD patients can appropriately appreciate. Relative risks can appear large for these medications, while, by contrast, the absolute risk may be quite low. Additionally, understanding the risks of foregoing immunomodulatory therapy--specifically, continued active disease and/or continued corticosteroid use--can frame an appropriate risk-benefit discussion for both patients and physicians.

Health supervision in the management of children and adolescents with IBD: NASPGHAN recommendations

Ulcerative colitis (UC) and Crohn disease (CD), collectively referred to as inflammatory bowel disease (IBD), are chronic inflammatory disorders that can affect the gastrointestinal tract of children and adults. Like other autoimmune processes, the cause(s) of these disorders remain unknown but likely involves some interplay between genetic vulnerability and environmental factors. Children, in particular with UC or CD, can present to their primary care providers with similar symptoms, including abdominal pain, diarrhea, weight loss, and bloody stool. Although UC and CD are more predominant in adults, epidemiologic studies have demonstrated that a significant percentage of these patients were diagnosed during childhood. The chronic nature of the inflammatory process observed in these children and the waxing and waning nature of their clinical symptoms can be especially disruptive to their physical, social, and academic development. As such, physicians caring for children must consider these diseases when evaluating patients with compatible symptoms. Recent research efforts have made available a variety of more specific and effective pharmacologic agents and improved endoscopic and radiologic assessment tools to assist clinicians in the diagnosis and interval assessment of their patients with IBD; however, as the level of complexity of these interventions has increased, so too has the need for practitioners to become familiar with a wider array of treatments and the risks and benefits of particular diagnostic testing. Nonetheless, in most cases, and especially when frequent visits to subspecialty referral centers are not geographically feasible, primary care providers can be active participants in the management of their pediatric patients with IBD. The goal of this article is to educate and assist pediatricians and adult gastroenterology physicians caring for children with IBD, and in doing so, help to develop more collaborative care plans between primary care and subspecialty providers.

Patient-specific approach to combination versus monotherapy with the use of antitumor necrosis factor α agents for inflammatory bowel disease

It is likely that the debate surrounding combination versus monotherapy will continue for the foreseeable future, because there will always be a risk-benefit ratio that must be taken into account with IBD therapy. However, because more studies now include a thoughtful approach with respect to concomitant IS therapy with inclusion of objective end points such as mucosal healing and drug pharmacokinetics, it is anticipated that this issue will become clearer over time, which will benefit patients and practitioners. The BRIDGe approach described in this review is a useful tool but must be taken in the context of the subjectivity of much of the analyzed data and the individual perspectives that influenced the results. It cannot in any way be interpreted as a clinical practice guideline or standard of care, but rather a tool that seeks to interpret and incorporate the available literature and, it is hoped, aid clinicians in making sense of the conflicting data in this area. The decision regarding the risks and benefits of combination therapy must be carefully weighed in each individual patient.

[Inflammatory bowel disease and lymphoproliferative disorders]

The risk of lymphoproliferative disorders (LPDs) has been reported to be increased in autoimmune diseases and chronic inflammatory diseases. Similar with other chronic inflammatory diseases such as rheumatoid arthritis, there is a concern about the risk of LPDs in patients with inflammatory bowel disease (IBD). Generally, in IBD patients, the risk of LPDs appears to be similar with or very slightly higher, compared to the general population. The association of therapeutic agents with the risk of LPDs is difficult to evaluate due to multiple other potentially involved factors and co-treatment with other agents. To date, data show that thiopurine is associated with a moderately increased risk of LPDs in patients with IBD. Evidence regarding the risk of LPDs in IBD patients using methotrexate is not sufficient, but the risk of LPDs seems low. The responsibility of anti-TNF-a agents on the risk of LPDs is difficult to determine, because most of IBD patients receiving anti-TNF-a agents are co-treated with thiopurines. Attention should be given to the high risk of hepatosplenic T-cell lymphoma in young male patients treated with anti-TNF-a agents together with thiopurines. The risk and benefit of immunosuppressive therapy for IBD should be carefully evaluated and individualized considering the risk of LPDs.

Risk of malignant lymphoma in patients with inflammatory bowel diseases: a Dutch nationwide study

BACKGROUND

Immune suppressant medications such as thiopurines and anti-tumor necrosis factor agents are important for maintaining disease control in most patients with inflammatory bowel diseases (IBDs); however, their use has been associated with the development of malignant lymphoma. The purpose of this Dutch nationwide study was to estimate the relative risk of malignant lymphoma in IBD patients.

METHODS

IBD patients who developed a lymphoma between 1997 and 2004 were identified using the Dutch National Database of PALGA. Data from confirmed cases were collected from individual hospitals, including data on Epstein-Barr virus (EBV). The age-adjusted 8-year incidence of malignant lymphoma in the Netherlands was retrieved from the Central Bureau of Statistics.

RESULTS

Forty-two hospitals were visited and 285 matches evaluated in the total cohort of 17,834 IBD patients. Forty-four lymphomas were observed, resulting in a relative risk of 1.27 (95% confidence interval [CI]: 0.92-1.68). Only 19 of 44 patients (43%) were exposed to azathioprine/6-mercaptopurine (AZA/6-MP). Remarkably, 92% of patients (11/12) with EBV-positive lymphoma used AZA/6-MP, in contrast to only 19% patients (4/21) with EBV-negative lymphoma, suggesting a strong relation between EBV-positive lymphoma and thiopurine use.

CONCLUSIONS

This nationwide study does not suggest a significant overall increased risk for lymphoma in IBD patients. A distinct correlation between EBV-positive lymphoma and AZA/6-MP use was observed.

Safety of biologics in inflammatory bowel disease

Various biologic agents have been evaluated in patients with inflammatory bowel disease (eg, Crohn's disease ) and ulcerative colitis (UC). At present, only one, infliximab (humanized monoclonal anti-tumor necrosis factor-alpha antibody), is approved by the US Food and Drug Administration for induction and maintenance treatment in patients with active moderate to severe and/or fistulizing CD who are refractory to conventional therapy. Two recent trials, Active Ulcerative Colitis Trial (ACT) 1 and ACT 2, observed high efficacy of infliximab in inducting and maintaining clinical remission, mucosal healing, and corticosteroid-sparing effects in patients with moderate to severe UC. A plethora of randomized, double-blind, controlled and open-label, uncontrolled studies on large and small numbers of patients has assessed efficacy and safety of various biologic agents of potential use in treatment of inflammatory bowel disease. With respect to safety of biologic agents used for treatment, the most accurate data are available only in the case of infliximab. This is due to the fact that infliximab was evaluated in many more trials than any other biologic agent. Moreover, postmarketing experience also provides very valuable information about any side effects occurring during treatment with this agent.

Primary intestinal lymphoma in patients with inflammatory bowel disease: a descriptive series from the prebiologic therapy era

BACKGROUND

Primary intestinal lymphoma in the setting of inflammatory bowel disease (IBD) is uncommon and may be associated with immune suppressive therapy. We report clinical features and outcomes in patients with both conditions prior to use of biologic therapy.

METHODS

All patients with primary intestinal lymphoma and IBD at our institution from 1960-2000 were retrospectively identified. Data reported are frequency (proportion) or median (interquartile range). Kaplan-Meier analysis was performed.

RESULTS

Fifteen patients were identified: 14 (93%) were male, 10 (66%) had Crohn's disease. Median age at diagnosis of IBD and lymphoma was 30 (22-51) and 47 (28-68) years, respectively, with bloody diarrhea the most common presenting symptom for each diagnosis. Lymphoma location was colorectal in nine (60%), small bowel in four (27%), and one (6.25%) each: stomach, duodenum, and ileal pouch. Treatments were surgery plus chemotherapy (n = 6), surgery alone (n = 3), chemotherapy alone (n = 2), chemotherapy and radiation (n = 1), surgery and radiation (n = 1); two patients died before treatment. Most patients (n = 11, 73%) were Ann Arbor stages I or II. Large cell B-type histology was most common (n = 9, 60%). Three patients died within 30 days of lymphoma diagnosis. Survival free of death from lymphoma at 1- and 5-years was 78% and 63%, respectively, and was associated with advanced lymphoma stage (P = 0.004).

CONCLUSIONS

Diagnosis and treatment of primary intestinal lymphoma in patients with IBD can be challenging and requires a high index of suspicion. Optimal survival requires multimodality therapy.

Clinical course of Crohn's disease following treatment of lymphoma

BACKGROUND

Crohn's disease (CD) patients may be at increased risk for the development of Hodgkin's lymphoma (HL) or non-Hodgkin's lymphoma (NHL), either through exposure to immunosuppressive medications or due to their underlying chronic inflammatory illness. There are limited data regarding the natural history of CD following treatment of lymphoma. We present a series of CD patients who were treated for lymphoma and describe the natural history of their CD following lymphoma treatment.

METHODS

Retrospective case series from three academic referral centers was used. All CD patients with a history of lymphoma were identified. Demographic data, CD medication exposure, and surgical procedures before and after lymphoma treatment were recorded.

RESULTS

Nine CD patients with a history of lymphoma were identified. Eight individuals received chemotherapy, while one patient was observed without treatment. Eight patients remained free of lymphoma for a mean of 72.8 months (range 1-276 months). The ninth patient had recurrence of his HL 3 years after lymphoma diagnosis. Following lymphoma treatment, two patients had quiescent CD with no specific therapy. Three patients demonstrated significant clinical relapse of their CD and a fourth patient developed CD after treatment of her lymphoma, which ultimately required long-term immunomodulator therapy with 6-mercaptopurine or methotrexate in the first three patients, and azathioprine in the fourth. Four patients required CD surgery after lymphoma treatment.

CONCLUSION

We report on the clinical course of CD in patients who develop lymphoma. Significant clinical relapse of CD following successful medical treatment of lymphoma occurred frequently in patients with a history of this neoplasm.

Incidence and risk factors for lymphoma in a single-center inflammatory bowel disease population

AIMS

Previous studies on the risk of lymphoma in inflammatory bowel disease (IBD) have yielded conflicting results. We aim to determine the incidence and risk factors for lymphoma in a large IBD population.

METHODS

Patients with lymphoma were identified from a single-center IBD database. The standardized incidence ratio (SIR) of lymphoma was estimated using data from the Surveillance, Epidemiology and End Results (SEER) registry. Risk factors for lymphoma were determined by comparing cases with a matched IBD control group.

RESULTS

Eleven lymphomas were identified among 3,585 IBD patients during an average of 8.4 years of observation. Three patients were excluded. In the remaining eight, median age at diagnosis was 47 years and mean IBD duration was 20 years (range 7.5-45 years). The SIR for lymphoma was 1.6 [95% confidence interval (CI) 0.6-3.0], and for non-Hodgkin lymphoma (NHL), 1.5 (0.3-2.8). Three lymphoma patients (38%) received prior immunomodulators and two (25%) received biologics, versus 57% and 39% in the control group, respectively (P = 0.4). No correlation was seen with tobacco exposure, disease duration, use, or dose or duration of immunosuppressive therapy.

CONCLUSIONS

In this IBD cohort, risk of lymphoma was not increased compared with the general population. Risk of lymphoma was not associated with any demographic or therapy-related factors.

Long-term complications, extraintestinal manifestations, and mortality in adult Crohn's disease in population-based cohorts

BACKGROUND

Crohn's disease (CD) is a chronic, progressive, destructive disease. Numerous intestinal and extraintestinal complications and manifestations can occur during its clinical course. This literature review summarizes our current knowledge of the long-term complications, extraintestinal complications, and mortality in CD in adults as reported in population-based studies that include long-term follow-up results.

METHODS

A literature search of English and non-English language publications listed in the electronic databases of Medline (source PubMed, 1935 to July, 2009).

RESULTS

The relative risk of incident fractures is increased in CD patients by ≈30%-40%. These patients have also have a 3-fold increased risk of deep venous thrombosis and pulmonary embolism. A variety of extraintestinal manifestations (primary sclerosing cholangitis, ankylosing spondylitis, iritis/uveitis, pyoderma gangrenosum, erythema nodosum) and diseases (asthma, bronchitis, pericarditis, psoriasis, rheumatoid arthritis, and multiple sclerosis) are associated with CD. The risks of colorectal and small bowel cancers relative to the general population are 1.4-1.9 and 21.1-27.1, respectively. A slightly increased risk of lymphoma, irrespective of medication use, has been reported in a recent meta-analysis of population-based studies. Overall mortality is slightly increased in CD, with a standardized mortality ratio of 1.4.

CONCLUSIONS

CD is frequently associated with disease complications and extraintestinal conditions. Whether the impact of changing treatment paradigms with increased use of immunosuppressives and biologic agents can reduce disease complications and associated conditions is unknown.

Risk of extra-intestinal cancer in inflammatory bowel disease: meta-analysis of population-based cohort studies

OBJECTIVES

Extra-intestinal manifestations of inflammatory bowel disease (IBD) are relatively common, whereas the risk of extra-intestinal cancer (EIC) remains uncertain. The aim of this study was to obtain a reliable estimate of the risk of EIC in Crohn's disease (CD) and ulcerative colitis (UC) by performing a meta-analysis of population-based cohort studies.

METHODS

A systematic literature review was performed using MEDLINE (1966-2009) and abstracts from recent international conferences. Eight population-based cohort studies comprising a total of 17,052 patients with IBD were available. Standardized incidence ratios (SIRs) of EICs were pooled in a meta-analysis approach using STATA software.

RESULTS

Overall, IBD patients were not at increased risk of EIC (SIR, 1.10; 95% confidence interval (CI) 0.96-1.27). However, site-specific analyses revealed that CD patients had an increased risk of cancer of the upper gastrointestinal tract (SIR 2.87, 95% CI 1.66-4.96), lung (SIR 1.82, 95% CI 1.18-2.81), urinary bladder (SIR 2.03, 95% CI 1.14-3.63), and skin (SIR 2.35, 95% CI 1.43-3.86). Patients with UC had a significantly increased risk of liver-biliary cancer (SIR 2.58, 95% CI 1.58-4.22) and leukemia (SIR 2.00, 95% CI 1.31-3.06) but a decreased risk of pulmonary cancer (SIR 0.39, 95% CI 0.20-0.74).

CONCLUSIONS

Although the overall risk of EIC was not significantly increased among patients with IBD, the risk of individual cancer types differed from that of the background population as well as between CD and UC patients. These findings may primarily be explained by smoking habits, extra-intestinal manifestations of IBD, and involvement of the upper gastrointestinal tract in CD.

Review article: malignancy on thiopurine treatment with special reference to inflammatory bowel disease

BACKGROUND

Immunosuppression is a risk factor for carcinogenesis. Thiopurines specifically contribute to this. As thiopurines are used more aggressively in the treatment of IBD, it is likely that we will see more thiopurine-related malignancy.

AIM

To review the literature, exploring how immunosuppression, thiopurines specifically, might cause cancer and which malignancies occur in practice, placing specific emphasis on IBD cohorts.

METHODS

Search terms included 'malignancy' 'cancer' 'azathioprine' 'mercaptopurine' 'tioguanine (thioguanine)' 'thiopurine' and 'inflammatory bowel disease' 'Crohn's disease' 'ulcerative colitis'. We also searched for specific cancers (lymphoma, colorectal cancer, skin cancer, cervical cancer) and reviewed the reference lists of the articles detected.

RESULTS

Immunosuppression is associated with an increased risk of cancer. Thiopurines are associated with specific additional risks. In IBD cohorts, very few thiopurine-related malignancies have been reported. However, studies suggest a relative risk of 4-5 for lymphoma. This still translates into a low actual risk, (one extra lymphoma in every 300-1400 years of thiopurine treatment).

CONCLUSIONS

Whilst we must be aware of this risk and counsel our patients appropriately, thiopurines remain a mainstay of IBD therapy. We present practical advice aimed at minimizing our patients' risk of developing malignancy, whilst optimizing the benefits that thiopurines can provide.