The 3020insC Allele of NOD2 Predisposes to Cancers of Multiple Organs
- Jan Lubiński1Email author,
- Tomasz Huzarski1,
- Grzegorz Kurzawski1,
- Janina Suchy1,
- Bartłomiej Masojć1,
- Marek Mierzejewski1,
- Marcin Lener2,
- Wenancjusz Domagała1,
- Maria Chosia1,
- Urszula Teodorczyk1,
- Krzysztof Mędrek1,
- Tadeusz Dębniak1,
- Elżbieta Złowocka1,
- Jacek Gronwald1,
- Tomasz Byrski1,
- Ewa Grabowska2,
- Katarzyna Nej2,
- Anna Szymańska1,
- Jolanta Szymańska1,
- Joanna Matyjasik1,
- Cezary Cybulski1,
- Anna Jakubowska1,
- Bohdan Górski1 and
- Steven A. Narod3
© The Author(s) 2005
Received: 7 March 2005
Accepted: 15 March 2005
Published: 20 March 2005
The NOD2 gene has been associated with susceptibility to Crohn's disease and individuals with Crohn's disease are at increased risk for cancer at a number of organ sites. We studied the association between the 3020insC allele of the NOD2 gene and cancer among 2604 cancer patients and 1910 controls from Poland. Patients were diagnosed with one of twelve types of cancer in the Szczecin region between 1994 and 2004. Significant associations were found for colon cancer (OR = 1.8; 95% CI 1.2 to 2.6), for lung cancer (OR = 1.7; 95% CI = 1.1 to 2.5) and for ovarian cancer (OR = 1.6; 95% CI 1.1 to 2.3). In addition, a significant association was found for early-onset laryngeal cancer (OR = 2.9; 95% CI 1.4 to 6.2) and for breast cancer in the presence of DCIS (OR = 2.1 95% CI = 1.2 to 3.6). The NOD2 3020insC allele is relatively common (in Poland 7.3% of individuals) and may be responsible for an important fraction of cancer cases. We estimate that the lifetime cancer risk among carriers of this allele is 30% higher than that of individuals with two wild-type alleles.
KeywordsNOD2 cancer susceptibility multiple organs
There is a longstanding interest in the role of chronic inflammation in carcinogenesis. Patients with chronic gastritis, hepatic cirrhosis and pancreatitis are at increased risk of cancer, and chronic gallstones and schistosomiasis are risk factors for cancer of the gallbladder and bladder respectively . There is also an elevated risk of colon cancer in individuals with inflammatory bowel disease, including Crohn's disease and ulcerative colitis . Epidemiologic evidence supports a role of genetic factors in inflammatory bowel disease and Crohn's disease has been associated with a mutation in the gene encoding nucleotide oligomerisation domain 2 (NOD2, also known as CARD15) [3, 4]. This protein is a component of the host defence against intracellular pathogens and is expressed by monocytes, granulocytes and several epithelial cells [5, 6]. Stimulation of NOD2-transfected cell lines with bacterial protein results in the activation of the nuclear factor κB (NFκB) pathway and deletion of NOD2 leads to the enhanced NF-κB activity . Approximately 25% of cases of Crohn's disease carry a mutation in NOD2 . The most common mutation, 3020insC, leads to the introduction of a stop codon in exon 11 and generates a truncated NOD2 protein which is missing the last 33 amino acids . This variant is associated with an increase in NF-κB activity . The other reported mutations are single amino acid substitutions and the effect of these on the NOD2 protein function is less clear.
Because of the reported associations between NOD2 and Crohn's disease and between Crohn's disease and colon cancer, we looked for NOD2 mutations in a series of 556 colon cancer patients from Szczecin, Poland and a positive association was reported . In order to define the range of cancer phenotypes associated with the NOD2 3020insC mutation we extended this study to include a total of 2604 invasive cancers of 12 different types and 1910 controls from Poland.
Cancer cases were collected from four large hospitals in the Szczecin area (University Clinic Hospitals, Regional Oncology Hospital and Hospital for Lung Diseases) between 1999 and 2004. Participation was requested of study subjects during outpatient clinic visits to the surgical and medical oncology clinics. In general, patient participation rates exceed 90% for each cancer site. Patients were consecutive, newly diagnosed cancer cases, unselected for age, sex or family history. Because of the relatively small number of patients with pancreatic cancer in the oncology clinics (n = 58) the pancreatic cancer group was supplemented by the inclusion of 69 deceased patients for whom archived tumour material was stored in the Pathology Department of the University Clinic Hospital. The thyroid cancers were all of the papillary type.
Cancers were classified according to age of diagnosis (<50 or ≥50). Because preliminary analyses suggested the excess of invasive breast tumours with an in situ component among cases with the NOD2 mutation, breast cancers were subdivided into subgroups according to the presence or absence of DCIS.
Two control groups were used. The first group consisted of 910 newborn children from six hospitals throughout Poland (Szczecin, Białystok, Gorzów Wlkp., Katowice and Wrocław), all collected in 2003. The second control group was taken from patient rolls of three family doctors practicing in the Szczecin region. Controls were selected at random from the patient lists of these doctors.
DNA was extracted from peripheral blood lymphocytes for all cases and controls with the exception of 69 pancreatic patients whose DNA was obtained from paraffin-embedded tumour tissue. The presence of 3020insC was detected using the method of Ogura et al  which is based on an allele-specific PCR assay. Allele specific primers are used to generate fragments of 319 bp and 214 bp representing the wild-type and mutant alleles, respectively. To verify the accuracy of the test a series of 29 samples was sequenced (11 positives and 18 negatives) and these were completely concordant with the results of the PCR assay. Additionally the presence of mutant alleles was confirmed by sequencing or/and RFLP-PCR method which uses the Apal restriction enzyme.
Statistical analysis included the comparison of the proportions of the prevalence of the allele in cases and controls. Odds ratios were generated from two-by-two tables and statistical significance was assessed using the (two-sided) Fisher exact test. Odds ratios were also generated by patient subgroups defined by age of diagnosis, and in the case of breast cancer, by the presence of DCIS.
Association of the NOD2 3020insC mutation and selected types of cancer
Prevalence of 3020insC (%)
Our data suggest that, in addition to Crohn's disease, the common founder mutation in the NOD2 gene leads to an increased susceptibility to a range of solid tumours. It is likely that cancer is a much more frequent manifestation of the NOD2 mutation than Crohn's disease. Based on the prevalence of 100 to 200 per 100,000 individuals for Crohn's disease and a relative risk of 2.6 associated with the NOD2 mutation , we expect that fewer than 1% of individuals with the NOD2 mutation will manifest Crohn's disease. In contrast, because of the elevated risks for a wide range of common cancers seen, the lifetime risk of cancer in carrier individuals will be many times higher. Our study subjects included patients with cancer of seven of the ten most common types of cancer in Poland, and which represent about two-thirds of all incident cases in the country . The risks in Table 1 correspond to an overall increase of approximately 30% for the lifetime cancer risk for carriers of the NOD2 3020insC allele mutation in Poland.
Interestingly, several of the cancer sites for which an association was seen are those which have previously been reported to be in excess in patients with Crohn's disease - including the colon and lung [9–16]. In a study from Italy three of the ten deaths in patients with Crohn's disease were due to lung cancer . In addition, patients with Crohn's disease also have an increased risk for inflammatory lesions of the larynx and for ovarian granulomas and cysts [18–20]. Other sites of interest, which appear to be in excess in Crohn's disease, but which were not studied here include lymphomas and cancers of the gallbladder, small intestine and appendix [9, 11, 21]. Overall, patients with Crohn's disease have a 29% increase in the risk of cancer . It will be of interest to establish the extent to which the NOD2 gene is responsible for the malignant complications of Crohn's disease. Overall, 25% of patients with Crohn's disease in Western Europe carry the 3020insC allele. We expect that the frequency of this allele in patients with Crohn's disease and malignancy might be much higher and that the lifetime risk of cancer in this genetically-defined subgroup will be increased.
There was no clear relationship between age of onset and the strength of the association. For laryngeal cancer the association was stronger with young-onset cases, for colon cancer the mutation was more prevalent in older-onset cases, for the ovary cancer there was no clear age effect. Typically, individuals with Crohn's disease are at increased risk for early-onset colon cancer.
It is perhaps surprising that a single polymorphism of the NOD2 gene has been associated with both Crohn's disease and with cancers of several sites, including colon cancer, given that a familial association of these two conditions has not been described. However, it should be remembered that the lifetime penetrance of the allele for Crohn's disease is probably less than 1% and for colon cancer probably does not exceed 10%. Therefore we do not expect that this allele, when present in a population, will result in the generation of families with a clear predisposition to the two conditions.
Deletion of NOD2 leads to the increased activation of NFκB . NFκB activity is pro-inflammatory in the gastro-intestinal tract as well as reducing apoptosis . Patients with Crohn's disease also have increased levels of NF-κB activity. NF-κB also plays a role in chronic lung disease and cigarette smoking is associated with both increased NF-κB activity and lung cancer risk . We found the NOD2 mutation to confer an increased risk of lung cancer; it is tempting to speculate that the NOD2 mutation leads to an increased risk of chronic obstructive lung disease and to a greater lung cancer risk, but it may be that other functions of NOD2, are equally or more important. Cytokines that are upregulated by NF-κB contribute to the growth of ovarian cancer tumour cells  and inhibition of NF-κB activity in ovarian cancer cells can suppress their growth .
Cases were recruited from the Szczecin region, which is populated by ethnic Poles who immigrated to the region from throughout Poland after the Second World War, when German residents were relocated elsewhere. Our control group was drawn both from the adult population of Szczecin and from newborns in five Polish cities. However, the frequency of the 3020insC allele was similar in the newborns (7.8%) and in the adult population (6.9%) and there was no statistical difference in the mutant allele frequency in the newborns recruited from the Szczecin metropolitan region (8.2%) or from other Polish cities (7.3%). It is possible that there are minor differences in the ethnic distribution of our cases and controls, but more importantly, our association study benefits from the general homogeneity of the Polish population, which is much less ethnically diverse than the populations of North America or of most Western European countries. This ethnic homogeneity has been exploited in several genetic studies in the past [26, 27]. This allele is present in other European countries and we expect that our findings will be replicated elsewhere, as they have been for colorectal cancer in the Greek population . There may be exceptions in some populations - for instance NOD2 polymorphisms could not be confirmed in the Finnish population as reported by Aaltonen et al  but we believe that this is most likely an exception and not the rule.
We have previously reported that the NOD2 gene is associated with an increased risk of colon cancer, in particular for patients diagnosed above the age of 50 years. We now believe that the gene is responsible for a wide range of cancer types, including lung, larynx and ovary. However, multiple comparisons were made and it is possible that some of our findings are due to chance. It will be important to confirm these findings in other populations. We believe that the presence of the NOD2 3020insC allele increases the lifetime risk of cancer by approximately 25% to 35%. For no single site was the increase particularly dramatic and at this point no standards of clinical recommendations regarding genetic screening or clinical surveillance can be made. NOD2 is involved in the regulation of the inflammatory process, but it is not clear that impairment in inflammation is the mechanism underlying the increased risk of cancer described here. It will be of interest to see if other genes involved in inflammation, or which are associated with inflammatory bowel disease, such as the recently described OCTN cation transporter genes , are also found to be associated with cancer susceptibility.
We would like to acknowledge the contributions of B. Czeszyńska, R. Czajka, B. Dębniak, W. Fabian, M. Foszczyńska-Kłoda, T. Grodzki, P. Serwatowski, E. Jaworowska, J. Kładny, E. Kowalska, A. Lenczewski, J. Menkiszak, A. Raczyński, I. Rzepka-Górska, A. Sikorski, T. Starzyńska, M. Uciński, A. Witek and J. Woytoń in collection of patients and controls and we wish to thank R. Scott for helpful discussions.
M. Lener, E. Kłujszo-Grabowska, K. Nej and J. Suchy are holders of scholarships from the Postgraduate School of Molecular Medicine affiliated with the Medical University of Warsaw and were partially supported by a grant from the Leopold Kronenberg Foundation.
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