title: [Chron's disease and cancer].
abstract: BACKGROUND
  The patients with Crohn's disease (CD) have a greater risk of gastrointestinal and hemopoietic cancers compared with background population. Identify groups of people affected by CD with exposition to factors that play a role in the development of cancer could be useful to plan correct diagnostic and therapeutic methods.
  
  
  METHODS
  A reaserch on "pubmed" with "Risk factors for cancer in patients with Crohn's disease", "Cancer and Crohn's disease" Crohn's disease and cancer risk" as key-words was conducted. We identified 35 studies and analized also references reported inside each single work.
  
  
  RESULTS
  Patients with CD have a higher risk of colorectal cancer (CRC). The risk of colon cancer alone was found to be increased, with no significant increase in the risk of rectal cancer. Factors that play a role in the development of CRC are: diagnosis of CD before 25-years-old, duration of disease, severity of inflammation, habit to cigarette's smoke, a familial history of CRC and immunosuppressive therapies. The risk of small bowel cancer was found to be increased, even if overall risk remains low. Although the role of immunosuppressive therapies remain to clarify yet, patients with CD have a higher risk of development lymphoma compared with background population.
  
  
  CONCLUSIONS
  Patients with CD are at high risk of large bowel, small bowel, extraintestinal and hemopoietic cancers. Selected patients with extensive colonic disease, which has been present from a young age, are at high risk of cancer and should be candidates for colonscopic surveillance.
authors.affiliation: Università degli Studi di Genova, Dipartimento di Discipline Chirurgiche e Metodologie Integrate, Genova. rfornaro@unige.it
authors.forename: Rosario
authors.initials: R
authors.lastname: Fornaro
authors.forename: Marco
authors.initials: M
authors.lastname: Frascio
authors.forename: Andrea
authors.initials: A
authors.lastname: Denegri
authors.forename: Cesare
authors.initials: C
authors.lastname: Stabilini
authors.forename: Mikaela
authors.initials: M
authors.lastname: Impenatore
authors.forename: Francesca
authors.initials: F
authors.lastname: Mandolfino
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Lazzara
authors.forename: Ezio
authors.initials: E
authors.lastname: Gianetta
mesh_terms: D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000209:etiology*; D003424:Crohn Disease / Q000150:complications* / Q000175:diagnosis; D019317:Evidence-Based Medicine; D019337:Hematologic Neoplasms / Q000209:etiology; D006801:Humans; D007414:Intestinal Neoplasms / Q000209:etiology; D008223:Lymphoma / Q000209:etiology; D011159:Population Surveillance / Q000379:methods; D018570:Risk Assessment; D012307:Risk Factors; D012720:Severity of Illness Index; D012907:Smoking / Q000009:adverse effects; D013997:Time Factors