Some of the following references to case reports do not appear in the main text.

1982 Abdul-Karim FW, King TA, Dahms BB, Gauderer MWL, Boat TF. Carcinoma of extrahepatic biliary system in an adult with cystic fibrosis. Gastroenterology 1982; 82:758-762. [PubMed]

1986 Tedesco FJ, Brown R, Schuman BM. pancreatic carcinoma in a patient with cystic fibrosis. Gastrointest Endosc 1986; 32:25-26.[PubMed]

1987  Siraganian PA, Miller RW, Swender PT. Cystic fibrosis and ileal carcinoma. Lancet 1987; 2(8568):1158,. [PubMed]

1988 McKintosh JC, Schoumacher RA, Tiller RE. pancreatic adenocarcinoma in a patient with cystic fibrosis. Am J Med 1988; 85:592.[PubMed] 

1993 Sheldon CD, Hodson ME, Carpenter LM, Swerdlow AJ. A cohort study of cystic fibrosis and malignancy. Brit J Cancer 1993; 68:1025-8.  [PubMed]

      Chris Sheldon

A cohort of 412 patients first attending a cystic fibrosis (CF) clinic between 1961 and 1989 were followed up to 30 June 1989. The number of malignancies observed in the cohort was compared with the number expected based on the age, sex and calendar-year-specific cancer registration rates for England and Wales. Four CF patients were diagnosed as having malignancies before 30 June 1989. The tumors were: adenocarcinoma of the terminal ileum; adenocarcinoma of the pancreas, testicular teratoma, and B-cell lymphoma. This compares with 0.89 malignancies expected on the basis of rates in England and Wales (Standardised Registration Ratio = 452; 95% confidence interval 122-1150, P = 0.03). The single case of adenocarcinoma of the terminal ileum contrasts with less than 0.001 expected (P = 0.003) and that of the pancreas with 0.007 expected (P = 0.01). A further adenocarcinoma of the pancreas was diagnosed 2 years after the end of the study period. The two cases of pancreatic cancer compare with 0.008 expected (P = 0.0001) during the period to mid 1991.

On the basis of the present findings and previous case reports in the literature, adenocarcinoma of the pancreas and adenocarcinoma of the terminal ileum may be associated with cystic fibrosis.

–  This is an early paper from the world’s largest adult CF centre at the Royal Brompton in London suggesting that there may be an association between CF and malignancy – an association later confirmed and particularly associated with CF patients who had received organ transplants. Many of the reports are of isolated case reports.

1994 Tsongalis GJ, Faber G, Dalldorf FG, Friedman KJ, Sillverman LM, Yankaskas JR. Association of pancreatic adenocarcinoma, mild lung disease, and delta f508 mutation in a cystic fibrosis patient. Clin Chem 1994; 40:1972-4.[PubMed]
The fifth case of adenocarcinoma of the pancreas to be reported in a person with CF and the first with molecular data.

2003 Maisonneuve P, FitzSimmons SC, Neglia JP, Campbell PW 3rd, Lowenfels AB. Cancer risk in non-tansplanted and transplanted cystic fibrosis patients: a 10-year study. J Nat Cancer Instit 2003; 95:381-387.[PubMed]
The aim of the study was to assess the risk of cancer in nontransplanted and transplanted CF patients. The authors followed 28,858 patients whose data were reported to the Cystic Fibrosis Foundation patient registry from 1990 through 1999 and compared the number of cancers observed in transplanted and nontransplanted patients to the number expected from population-based cancer incidence data. All statistical tests were two-sided.
In 202 999 person-years of observation of nontransplanted CF patients, 75 cancers were observed, but 69.7 were expected (standardized incidence ratio [SIR] = 1.1, 95% confidence interval [CI] = 0.8 to 1.4). Twenty-three digestive tract tumors were observed, but 4.5 were expected (SIR = 5.1, 95% CI = 3.2 to 7.6). More cancers than expected were observed of the small bowel, colon, and biliary tract but not of the stomach or rectum. They found that the deficit of non-digestive tract tumors was not statistically significant (52 observed versus 65.2 expected; SIR = 0.80, 95% CI = 0.6 to 1.0; P =.055). In 2725 person-years of observation of 1063 transplanted patients, 13 cancers were observed, but 2.05 were expected (SIR = 6.3, 95% CI = 3.4 to 10.8), and more digestive tract tumors (four observed versus 0.19 expected; SIR = 21.2, 95% CI = 5.8 to 54.2) and lymphomas (seven observed versus 0.16 expected; SIR = 44.0, 95% CI = 17.7 to 90.7) were observed than expected.

The authors observed an increased risk of digestive tract cancers among adult CF patients, particularly of the small bowel, colon, and biliary tract. This increased risk appeared to be more pronounced in patients who had had an organ transplantation.

2004 McKeon D, Day A, Parmar J, Alexander G, Bilton D. Hepatocellular carcinoma in association with cirrhosis in a patient with cystic fibrosis. J Cyst Fibros 2004; 3:193-195.[PubMed]
Cystic fibrosis liver disease (CFLD) occurs in 37% of patients with CF. To date and to the best of our knowledge, there has not been a documented case of hepatocellular carcinoma in association with cirrhosis and CF. A 32-year-old lady with cystic fibrosis (CF) had ultrasound lesions consistent with hepatocellular carcinoma, confirmed on histology. She was also pregnant at the time of diagnosis. Her tumour was considered too large for resection and liver transplantation and she was referred to a national centre for laser ablative therapy.

–   The authors are concerned that with the increased life expectancy of patients with CF and the chronic nature of CFLD that this may be an increasingly recognised complication amongst the CF adult population. Therefore, they have changed their practice to more intense surveillance of patients with established CFLD to incorporate biannual ultrasound imaging of the hepatic system and yearly serum concentration measurements of alpha-fetoprotein.

2005 Oermann CM, Al-Salmi Q, Seilheimer DK, Finegold M, Tatevian N. Mucinous cystadenocarcinoma of the pancreas in an adolescent with cystic fibrosis.  Pediatr Devel Pathol 2005; 8:391-396. [PubMed]
The tumour developed within a pancreatic cyst that had been identified 13 years before resection and highlights the premalignant potential of pancreatic cysts in this at-risk population.

2005 Kelleher T, Staunton M, O’Mahaony S, McCormick PA. Advanced hepatocellular carcinoma associated with cystic fibrosis. Eur J Gastroenterol Hepatol 2005; 17 1123-1124. [PubMed]
A 13-year-old boy with CF presented with pneumaturia secondary to a colonic adenocarcinoma.

2008 Lees AN, Reid DW. Management dilemma; a woman with cystic fibrosis and severe lung disease presenting with colonic carcinoma: a case report.J Med Case Rep.J Med Case Rep 2008; 2:384. [PubMed]
A 41-year-old Caucasian woman with cystic fibrosis and severe lung disease who had been considered for lung transplantation, who presented with rectal bleeding and was found to have a Stage I adenocarcinoma of the sigmoid colon. After considerable discussion as to the operative risks, she underwent a laparoscopic resection and remains relatively well 1 year postoperatively with no recurrence.

2010 Healy F, Mulloy E, Peirce TH, Mahony MJ. Co-morbidity in a cystic fibrosis population attneding a regional clinic. Irish Med J 2010; 103:313-314.  [PubMed]

Mike O’Mahony

Pulmonary disease remains the major cause of morbidity in patients with cystic fibrosis (CF). However, of 115 patients attending a regional CF clinic there were 16 cases (14%) with co-morbid conditions. Of this group, 4 of 115 patients (3.5%) had renal problems including both structural and functional defects and 4 (3.5%) had neurological disorders, 3 of which were types of epilepsy. Notably, 3 of 115 patients (2.6%) had different forms of neoplasia, all of which required significant surgical and/or chemotherapeutic intervention. There is now increasing evidence of the association between digestive tract malignancy and CF, which further complicates management of these already complex cases.

Additional suggestion that there is an increased incidence of malignancy in people with CF from an unselected large group of patients at Dr Mike Mahony’s CF centre in Limerick in the West of Ireland

2011 Meyer KC, Francois ML, Thomas HK, Radford KL, Hawes DS, Mack TL, Cornwell RD, Maloney JD, De Oliveira NC. Colon cancer in lung transplant recipients with CF: increased risk and results of screening. J Cyst Fibros 2011; 10:366-369. [PubMed].
A study to determine the incidence of colon cancer in lung transplant recipients with cystic fibrosis (CF) and review screening colonoscopic findings in other recipients with CF. A retrospective chart review was performed for all patients with CF transplanted at the University of Wisconsin Hospital and Clinics (January 1994 through December 2010).
Four of 70 transplant recipients with CF developed fatal colon carcinoma following transplantation, and the cancer was advanced in all 4 recipients (age 31, 44, 44, 64 years) at the time of diagnosis. In contrast, only one of 287 recipients transplanted for non-CF indications developed colon cancer. Of all recipients with CF who did not develop colon cancer, 20 recipients underwent screening colonoscopy at 1 to 12 years following transplantation. Seven (35%) of the screened transplant recipients (ages 36, 38, 40, 41, 43, 49, 51 years) had colonic polyps in locations ranging from cecum to sigmoid colon and up to 3 cm in diameter.

The authors concluded that in contrast to non-CF recipients, patients with CF displayed a significant incidence of colon cancer (4 of 70 recipients; 5.7%) with onset ranging from 246 days to 9.3 years post-transplant, which may be due to a combination of their underlying genetic disorder plus intense, sustained immunosuppression following lung transplantation. Colonoscopic screening may identify patients with pre-malignant colonic lesions and prevent progression to colonic malignancy.

2014 Gory I. Brown G. Wilson J. Kemp W. Paul E. Roberts SK. Increased risk of colorectal neoplasia in adult patients with cystic fibrosis: a matched case-control study. Scand J Gastroenterol 2014; 49:1230-6. [PubMed].
A matched case-control study of adult CF patients in Melbourne undergoing colonoscopy in a 5-year period from 2007 to 2012. Controls were matched in a 2:1 ratio for age, gender, and colonoscopy indication. A total of 50 patients with CF who underwent colonoscopy were identified. Among CF patients, there were 5 (10%) cases with colorectal cancer (CRC), 1 (2%) with ileal adenocarcinoma, 13 (26%) with adenomas, and 16 (32%) with advanced adenomas. In contrast in controls there was 1 (1%) case with CRC, 11 (11%) with adenomas, and 6 (6%) with advanced adenomas.
Compared to controls, CF was associated with a 10-fold increased risk of CRC, threefold increased risk of adenomas and sevenfold increased risk of advanced adenomas.
The authors suggest that CF patients are at significantly increased risk of CRC compared to age, sex, and colonoscopy-indication matched controls. They suggest that consideration should be given to the introduction of a CRC surveillance program in the CF population.

–   Further evidence supporting previous studies reporting an increased risk of colorectal carcinoma in adults with CF.

Niccum DE, Billings JL, Dunitz JM, Khoruts A. Colonoscopic screening shows increased early incidence and progression of adenomas in cystic fibrosis. J Cyst Fibros. 2016 Feb 2. pii: S1569-1993(16)00009-6. doi: 10.1016/j.jcf.2016.01.002. [Epub ahead of print] [PubMed]
Colorectal cancer is an emerging problem in cystic fibrosis (CF). The goal of this study was to evaluate adenoma detection by systematic colonoscopic screening and surveillance. The authors analyzed prospectively collected results of colonoscopies initiated at age 40 years from 88 CF patients at a single Cystic Fibrosis Center. They also reviewed results of diagnostic colonoscopies from 27 patients aged 30-39years performed during the same time period at the Center.The incidence of polyp detection increased markedly after age 40 in CF patients. Greater than 50% were found to have adenomatous polyps; approximately 25% had advanced adenomas as defined by size and/or histopathology; 3% were found to have colon cancer. Multivariate analysis demonstrated specific risk factors for adenoma formation and progression.

They suggested early screening and more frequent surveillance should be considered in patients with CF due to early incidence and progression of adenomas in this patient population.

– This is obviously potentially a serious problem as the survival improves for people

Fink AK, Yanik EL, Marshall BC, Wilschanski M, Lynch CF, Austin AA, Copeland G, Safaeian M, Engels EA. Cancer risk among lung transplant recipients with cystic fibrosis. J Cyst Fibros. 2017 Jan;16(1):91-97. doi: 10.1016/j.jcf.2016.07.011. Epub 2016 Aug 15.   [Pubmed]

                   Aliza Fink

The authors used data from the US transplant registry and 16 cancer registries. Standardised incidence ratios (SIRs) compared cancer incidence to the general population, and competing risk methods were used for the cumulative incidence of colorectal cancer.

They evaluated 10,179 lung recipients (1681 with CF). Risk was more strongly increased in CF recipients than non-CF recipients for overall cancer (SIR 9.9 vs. 2.7) and multiple cancers including colorectal cancer (24.2 vs. 1.7), oesophageal cancer (56.3 vs. 1.3), and non-Hodgkin lymphoma (61.8 vs. 9.4). At five years post-transplant, colorectal cancer was diagnosed in 0.3% of CF recipients aged <50 at transplant and 6.4% aged ≥

The authors concluded CF recipients have increased risk for colorectal cancer, and suggested a need for enhanced screening.

Dr. Aliza Fink (figure) is the lead epidemiologist in a number of national cancer studies in the USA.

2017 Gini A, Zauber AG, Cenin DR, Omidvari AH, Hempstead SE, Fink AK, Lowenfels AB. Cost-Effectiveness of Screening Individuals With Cystic Fibrosis for Colorectal Cancer. Gastroenterology. 2017 Dec 27. pii: S0016-5085(17)36715-X. doi: 10.1053/j.gastro.2017.12.011. [Epub ahead of print] [Pubmed]
Individuals with cystic fibrosis are at increased risk of colorectal cancer (CRC) compared to the general population, and risk is higher among those who received an organ transplant. The authors performed a cost-effectiveness analysis to determine optimal CRC screening strategies for patients with cystic fibrosis. They adjusted the existing Microsimulation Screening Analysis-Colon microsimulation model to reflect increased CRC risk and lower life expectancy in patients with cystic fibrosis. Modeling was performed separately for individuals who never received an organ transplant and patients who had received an organ transplant. They modeled 76 colonoscopy screening strategies that varied the age range and screening interval. The optimal screening strategy was determined based on a willingness to pay threshold of $100,000 per life-year gained. Sensitivity and supplementary analyses were performed, including fecal immunochemical test (FIT) as an alternative test, earlier ages of transplantation, and increased rates of colonoscopy complications, to assess whether optimal screening strategies would change.

Colonoscopy every 5 years, starting at age 40 years, was the optimal colonoscopy strategy for patients with cystic fibrosis who never received an organ transplant; this strategy prevented 79% of deaths from CRC. Among patients with cystic fibrosis who had received an organ transplant, optimal colonoscopy screening should start at an age of 30 or 35 years, depending on the patient’s age at time of transplantation. Annual fecal immunochemical screening (FIT) screening was predicted to be cost-effective for patients with cystic fibrosis. However, the level of accuracy of the FIT in population is not clear.

Using a Microsimulation Screening Analysis-Colon microsimulation model, the authors found screening of patients with cystic fibrosis for CRC to be cost-effective. Due to the higher risk in these patients for CRC, screening should start at an earlier age with a shorter screening interval. The findings of this study (especially those on FIT screening) may be limited by restricted evidence available for patients with cystic fibrosis.

2017 Hadjiliadis D, Khoruts A, Zauber AG, Hempstead SE, Maisonneuve P, Lowenfels AB; Cystic Fibrosis Colorectal Cancer Screening Task Force. Collaborators (21). Cystic Fibrosis Colorectal Cancer Screening Consensus Recommendations. Gastroenterology. 2017 Dec 28. pii: S0016-5085(17)36716-1. doi: 10.1053/j.gastro.2017.12.012. [Epub ahead of print] [Pubmed]
Improved therapy has substantially increased survival of persons with cystic fibrosis (CF). But the risk of colorectal cancer (CRC) in adults with CF is 5-10 times greater compared to the general population, and 25-30 times greater in CF patients after an organ transplantation. An independent decision analysis evaluating the benefits of screening relative to harms and resources required was conducted by the Department of Public Health at Erasmus Medical Center, Netherlands using the Microsimulation Screening Analysis model from the Cancer Innervation and Surveillance Modeling Network. The task force included recommendation statements in the final guideline only if they reached an 80% acceptance threshold.

The task force makes 10 clear CRC screening recommendations that emphasize shared, individualized decision-making and familiarity with CF-specific gastrointestinal challenges. They recommend colonoscopy as the preferred screening method, initiation of screening at age 40 years, 5-year re-screening and 3-year surveillance intervals (unless shorter interval is indicated by individual findings), and a CF-specific intensive bowel preparation. Organ transplant recipients with CF should initiate CRC screening at age 30 years within 2 years of the transplantation because of the additional risk for colon cancer associated with immunosuppression.

2017 Magruder JT, Crawford TC, Grimm JC, Shah AS, Bush EL, Higgins RS, Merlo CA. Risk Factors for De Novo Malignancy Following Lung Transplantation. Am J Transplant. 2017 Jan;17(1):227-238.[Pubmed]
Risk factors for non-skin cancer de novo malignancy (DNM) after lung transplantation have yet to be identified. The authors queried the United Network for Organ Sharing database for all adult lung transplant patients between 1989 and 2012. Standardised incidence ratios (SIRs) were computed by comparing the data to Surveillance, Epidemiology, and End Results Program data after excluding skin squamous/basal cell carcinomas. They identified 18,093 adult lung transplant patients; median follow-up time was 1086 days (interquartile range 436-2070).
De novo malignancy occurred in 1306 patients, with incidences of 1.4%, 4.6%, and 7.9% at 1, 3, and 5 years, respectively. The overall cancer incidence was elevated compared with that of the general US population (SIR 3.26, 95% confidence interval [CI]: 2.95-3.60). The most common cancer types were lung cancer (26.2% of all malignancies, SIR 6.49, 95% CI: 5.04-8.45) and lymphoproliferative disease (20.0%, SIR 14.14, 95% CI: 9.45-22.04). Predictors of DNM following lung transplantation were age (hazard ratio [HR] 1.03, 95% CI: 1.02-1.05, p < 0.001), male gender (HR 1.20, 95% CI: 1.02-1.42, p = 0.03), disease etiology (not cystic fibrosis, idiopathic pulmonary fibrosis or interstitial lung disease, HR 0.59, 95% CI 0.37-0.97, p = 0.04) and single-lung transplantation (HR 1.64, 95% CI: 1.34-2.01, p < 0.001). Significant interactions between donor or recipient smoking and single-lung transplantation were noted. On multivariable survival analysis, DNMs were associated with an increased risk of mortality (HR 1.44, 95% CI: 1.10-1.88, p = 0.009).

–    These figures do not indicate a particular risk for people with CF?

Hadjiliadis DKhoruts AZauber AGHempstead SEMaisonneuve PLowenfels ABCystic Fibrosis Colorectal Cancer Screening Task Force. Cystic Fibrosis Colorectal Cancer Screening Consensus Recommendations.Gastroenterology. 2018 Feb;154(3):736-745.e14. doi: 10.1053/j.gastro.2017.12.012. Epub 2017 Dec 29.[Pubmed]

   Denis Hadjiliadis

The risk of colorectal cancer (CRC) in adults with CF is 5-10 times greater compared to the general population, and 25-30 times greater in CF patients after an organ transplantation. To address this risk, the CF Foundation convened a multi-stakeholder task force to develop CRC screening recommendations.  The task force made 10 CRC screening recommendations. They  recommend colonoscopy as the preferred screening method, initiation of screening at age 40 years, 5-year re-screening and 3-year surveillance intervals (unless shorter interval is indicated by individual findings), and a CF-specific intensive bowel preparation. Organ transplant recipients with CF should initiate CRC screening at age 30 years within 2 years of the transplantation because of the additional risk for colon cancer associated with immunosuppression. These recommendations aim to help CF adults, families, primary care physicians, gastroenterologists, and CF and transplantation centres address the issue of CRC screening.

Dr. Denis Hadjiliadis (figure) is a pulmonologist in Philadelphia, Pennsylvania and is affiliated with multiple hospitals in the area, including Hospitals of the University of Pennsylvania-Penn Presbyterian and Penn Presbyterian Medical Center and oversees one of the largest adult CF clinics in N America.

Vipul PatelTilottama MajumdarIsha SamreenHarpreet GrewalThomas Kaleekal.   Primary lung carcinoma in cystic fibrosis: A case report and literature review. Case Reports  Respir Med Case Rep   2020 Oct 10;31:101242.doi: 10.1016/j.rmcr.2020.101242. eCollection 2020. FREE [Pubmed]

Vipul Patel

Patients with cystic fibrosis (CF) have increased life span because of improved care over last 50 years. With increasing survival, predisposition of cancer may become evident. We have observed increase risk of gastrointestinal tract cancer, testicular cancer and lymphoid leukemia. Lung cancer in patients with CF is rare. Our patient developed chronic respiratory failure due to CF related bronchiectasis. Patient had progressive disease despite optimum treatment, requiring lung transplantation. Pathology of explant lung showed focus of invasive adenocarcinoma of lung origin. Patient had no evidence of lung carcinoma recurrence in one year. To our knowledge this is the fourth reported lung cancer case in a patient with CF.

Dr Vipul Patel is a critical care specialist in the Division of Pulmonary and Critical Care Medicine, Department of Medicine, Newark Beth Israel Medical Center, New Jersey USA.

Patricia Scott, Kyle AndersonMekhla SinghaniaRobert Cormier. Cystic Fibrosis, CFTR, and Colorectal Cancer. Int J Mol Sci.2020 Apr 21;21(8):E2891. doi: 10.3390/ijms21082891.[Pubmed]

     Patricia Scott

Cystic fibrosis (CF), caused by biallelic inactivating mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, has recently been categorized as a familial colorectal cancer (CRC) syndrome. CF patients are highly susceptible to early, aggressive colorectal tumor development. Endoscopic screening studies have revealed that by the age of forty 50% of CF patients will develop adenomas, with 25% developing aggressive advanced adenomas, some of which will have already advanced to adenocarcinomas. This enhanced risk has led to new CF colorectal cancer screening recommendations, lowering the initiation of endoscopic screening to age forty in CF patients, and to age thirty in organ transplant recipients.

The enhanced risk for CRC also extends to the millions of people (more than 10 million in the US) who are heterozygous carriers of CFTR gene mutations. Further, lowered expression of CFTR is reported in sporadic CRC, where downregulation of CFTR is associated with poor survival. Mechanisms underlying the actions of CFTR as a tumor suppressor are not clearly understood. Dysregulation of Wnt/β-catenin signaling and disruption of intestinal stem cell homeostasis and intestinal barrier integrity, as well as intestinal dysbiosis, immune cell infiltration, stress responses, and intestinal inflammation have all been reported in human CF patients and in animal models. Notably, the development of new drug modalities to treat non-gastrointestinal pathologies in CF patients, especially pulmonary disease, offers hope that these drugs could be repurposed for gastrointestinal cancers.

Dr Patricia Scott is Assistant Professor in the Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN 55812, USA.

Zhuqing ShiJun WeiRong NaW Kyle ResurreccionS Lilly ZhengPeter J HulickBrian T Helfand Mark S Talamonti Jianfeng Xu.  Cystic Fibrosis F508del Carriers and Cancer Risk: Results from the UK Biobank. Int J Cancer 2020 Dec 10. doi: 10.1002/ijc.33431. Online ahead of print. [Pubmed]

     Zhuqing Shi

Cystic fibrosis (CF) carriers carrying one defective copy of a CFTR germline mutation are common in the general population. A recent study reported associations of CF carriers with risk for cancers of digestive organs and pancreatic cancer.  In the current study, we assessed associations of CFTR F508del carriers with the risk for 54 types of cancers in the UK Biobank, a large population-based study.  In Caucasians, compared to the carrier rate of 3.15% (12,357/392,274) in non-cancer subjects, the rate was significantly higher in cancer patients overall (2,621/79,619=3.29%), especially in patients with colorectal cancer (247/6,667=3.70%), cancers of gallbladder and biliary tract (21/351=5.98%), thyroid cancer (30/665=4.51%), and unspecified non-Hodgkin’s lymphoma (74/1,805=4.10%), all P<=0.05. In contrast, the carrier rate in patients with cancers of lung and bronchus was significantly lower (89/3,463=2.57%), P=0.05. The association of CFTR F508del carriers with these types of cancer remained significant after adjusting for respective cancer-specific risk factors. For pancreatic cancer, although a higher carrier rate (38/1,004=3.78%) was found in patients with this cancer, the difference was not statistically significant (P=0.26). This null association was unlikely due to lack of statistical power; the large sample size of our study had >80% power, at a significance level of 0.05, to detect an association of >1.5-fold increased risk.
In conclusion, the identified associations of CFTR F508del carriers with multiple types of cancer may have potential biological and clinical implications if confirmed in independent study populations.

Dr Zhuqing Shi is from the Program for Personalized Cancer Care, NorthShore University Health System, Evanston, IL.

Olga ArchangelidiPaul CullinanNicholas J SimmondsEmmanouil MentzakisDaniel PeckhamDiana BiltonSiobhán B Carr. Incidence and risk factors of cancer in individuals with cystic fibrosis in the UK; a case-control study. J Cyst Fibros 2021 Aug 1;S1569-1993(21)01302-3.doi: 10.1016/j.jcf.2021.07.004.Online ahead of print.     [Pubmed]

      Olga Archangelidi

To assess cancer incidence in the UK cystic fibrosis (CF) population and determine the associated risk factors, we undertook a nested case-control study of patients with CF, registered with the UK CF Registry. Each case with a first reported cancer between 1999 and 2017 was matched with up to 4 controls: by age (±2-years) and year of cancer diagnosis.

From 12,886 registered patients, 146 (1.1%) cases of malignancy were identified with 14.3% of cases occurring post solid organ transplant. Site of primary cancer was available for 98 patients: 22% were gastro-intestinal in origin (77% lower, 23% upper GI), 13% skin, 13% breast and 11% lymphomas/leukaemia. In univariable analysis, transplantation increased the odds of reporting any cancer by 2.46 times (95%CI: 1.3-4.6). CFRD also increased the odds of reporting any cancer (OR 2.35; CI: 1.37-4.0) and PPI use (OR 2.0; CI 1.28-3.19). In the multivariable models significant associations with CFRD and transplant remained, while PA infection, PPI use and being overweight showed increased, but statistically insignificant risks. The incidence of GI cancer was strongly associated with CFRD (OR=4.04; 1.47-11.1).

Conclusions: We observed a high incidence of lower GI cancers in our cohort which was significantly affected by the presence of CFRD. Screening for gastrointestinal cancers could benefit patients at higher risk.

Dr Olga Archangelidi a post-doctoral research associate at the National Heart and Lung Institute, Imperial College, London; Amgem Ltd.

Patrick MaisonneuveAlbert B Lowenfels.   Cancer in Cystic Fibrosis: A Narrative Review of Prevalence, Risk Factors, Screening and Treatment ChallengesChest 2021 Sep 15;S0012-3692(21)03858-7.doi: 10.1016/j.chest.2021.09.003.Online ahead of print. [Pubmed]

   Patrick Maisonneuve

Cystic fibrosis is a progressive monogenetic disorder that causes persistent pulmonary disease, but also affects other organ systems including the digestive tract. Recent advances in treatment and care of CF patients including the use of new and highly effective CFTR modulators, have led to a dramatic increase in survival; young patients with CF can now expect to live to or beyond middle age, where cancer is more frequent. CF patients are now known to face an increased risk of digestive tract cancer-particularly cancer of the colon. The risk, which could be triggered by associated CF-related conditions or other genetic mechanisms, is even greater in patients who received a transplant. There is also some evidence that CF patients develop adenomatous polyps more frequently and at an earlier age than non-CF subjects. To reduce the excess risk of intestinal cancer in CF patients, the Cystic Fibrosis Foundation has developed colonoscopy-based guidelines. For non-transplanted patients, colonoscopy should commence at age 40, with rescreening at five-year intervals; the screening interval should be shortened to three years if adenomatous polyps are discovered. For transplanted patients, screening should start at age 30, or within two years of the transplant operation. Prior to colonoscopy, it is essential for CF patients to undergo a special, more intensive bowel preparation than normally used for non-CF persons. Whether the new drugs that have dramatically improved morbidity and mortality for CF patients will alter the risk of cancer is unknown and needs to be assessed in future studies.

Dr Patrick Maisonneuve is in the Division of Epidemiology and Biostatistics, IEO European Institute of Oncology IRCCS, Milan Italy.

Dorothea AppeltTeresa FuchsGratiana SteinkampHelmut Ellemunter. Malignancies in patients with cystic fibrosis: a case series J Med Case Rep 2022 Jan 19;16(1):27. doi: 10.1186/s13256-021-03234-1.  [Pubmed]
Background: Previous reports have shown an increased number of colorectal cancers in patients with cystic fibrosis. We assessed the database of our cystic fibrosis centre to identify patients with all kinds of cancer retrospectively. All patients visiting the Cystic Fibrosis Centre Innsbruck between 1995 and 2019 were included

Case presentation: Among 229 patients with cystic fibrosis treated at the Cystic Fibrosis Centre in Innsbruck between 1995 and 2019, 11 subjects were diagnosed with a malignant disease. The median age at diagnosis was 25.2 years (mean 24.3 years). There were four gynaecological malignancies (cervical intraepithelial neoplasia and cervical cancer), two haematological malignancies (acute lymphocytic leukemia), one gastrointestinal malignancy (peritoneal mesothelioma), and four malignancies from other origins (malignant melanoma, neuroblastoma, adrenocortical carcinoma, and thyroid cancer). One malignancy occurred after lung transplantation. There was a strong preponderance of females, with 10 of the 11 cases occurring in women. Six deaths were attributed to cancer.
Conclusions: Most diagnoses were made below 30 years of age, and half of the subjects died from the malignant disease.    Awareness of a possible malignancy is needed in patients with atypical symptoms. Regular screenings for cancer should also be considered, not only for gastrointestinal tumours.

Dr Dorothea Applelt is at the Medical University of Innsbruck, Cystic Fibrosis Centre Innsbruck, 6020, Innsbruck, Austria.