title: Venous thrombosis and risk of cancer in patients with arterial cardiovascular disease.
abstract: BACKGROUND
  Patients with acute myocardial infarction or stroke are at high risk of venous thromboembolism, which is traditionally considered a complication rather than a marker of occult cancer. We examined the association between venous thromboembolism and cancer in patients with acute myocardial infarction or stroke.
  
  
  METHODS
  We used medical databases to conduct a population-based cohort study including all patients with a first-time venous thromboembolism from 1978 through 2011 who also had a diagnosis of acute myocardial infarction (n=2,878) or stroke (n=1,971) recorded on the same day or within the previous 90days. We followed patients until a first-time cancer diagnosis, emigration, death, or December 31, 2011, whichever came first. We computed 1-year absolute risks and standardised incidence ratios for cancer based on national incidence rates.
  
  
  RESULTS
  The 1-year absolute cancer risk was 2.7% in the acute myocardial infarction cohort and 3.7% in the stroke cohort. The corresponding standardised incidence ratios were 3.22 (95% confidence interval [CI]: 2.54-4.03) and 3.76 (95% CI: 2.95-4.74), respectively. For cancers diagnosed in the first year, the estimated number of venous thromboembolism patients needed to examine to detect one excess cancer was 25 in the acute myocardial infarction cohort and 19 in the stroke cohort.
  
  
  CONCLUSIONS
  Among acute myocardial infarction and stroke patients, venous thromboembolism can be a marker of occult cancer. We suggest that current guidelines for cancer screening in patients with unprovoked venous thromboembolism could be applied to this group of patients.
authors.affiliation: Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark. Electronic address: saj@clin.au.dk.
authors.forename: Sigrun Alba Johannesdottir
authors.initials: SA
authors.lastname: Schmidt
authors.affiliation: Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
authors.forename: Dóra Körmendiné
authors.initials: DK
authors.lastname: Farkas
authors.affiliation: Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
authors.forename: Lars
authors.initials: L
authors.lastname: Pedersen
authors.affiliation: Department of Medicine, Vascular Medicine Unit, University Hospital of Padua, Padua, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Prandoni
authors.affiliation: Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
authors.forename: Henrik Toft
authors.initials: HT
authors.lastname: Sørensen
mesh_terms: D000368:Aged; D001158:Arteries / Q000503:physiopathology*; D015331:Cohort Studies; D016208:Databases, Factual; D003718:Denmark; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications*; D009369:Neoplasms / Q000150:complications*; D012042:Registries; D012307:Risk Factors; D020521:Stroke / Q000150:complications*; D020246:Venous Thrombosis / Q000150:complications* / Q000628:therapy*
keywords: Cancer; Epidemiology; Myocardial infarction; Stroke; Venous thrombosis