title: Preoperative plasma D-dimer is a predictor of postoperative deep venous thrombosis in colorectal cancer patients: a clinical, prospective cohort study with one-year follow-up.
abstract: OBJECTIVE
  The study examined if preoperative plasma D-dimer level was associated with the postoperative cumulative incidence of deep venous thrombosis in patients with colorectal cancer admitted for intended curative surgery.
  
  
  METHODS
  In 176 consecutive patients with newly-diagnosed colorectal cancer and absence of preoperative deep venous thrombosis, we measured the preoperative plasma D-dimer levels and performed compression ultrasonography for deep venous thrombosis prior to surgery, as well as one week, one month, and one year after surgery.
  
  
  RESULTS
  The cumulative incidence of deep venous thrombosis up to one year after surgery was 20 percent (95 percent confidence interval, 12 to 31 percent) in the positive D-dimer group compared with 5 percent (95 percent confidence interval, 2 to 12 percent) in the negative D-dimer group. The adjusted hazard ratio of deep venous thrombosis in the positive vs. the negative D-dimer group was 6.53 (95 percent confidence interval, 1.58 to 27.0).
  
  
  CONCLUSIONS
  A positive preoperative D-dimer was associated with a higher cumulated incidence of postoperative deep venous thrombosis. D-dimer might be useful in identifying those colorectal cancer patients who fail to respond to standard prophylaxis for deep venous thrombosis.
authors.affiliation: Department of Surgical Gastroenterology A, Aalborg Hospital, Aarhus University Hospital, Aarhus, Denmark. mogens.stender@rn.dk
authors.forename: Mogens T
authors.initials: MT
authors.lastname: Stender
authors.forename: Jens B
authors.initials: JB
authors.lastname: Frøkjaer
authors.forename: Torben B
authors.initials: TB
authors.lastname: Larsen
authors.forename: Søren
authors.initials: S
authors.lastname: Lundbye-Christensen
authors.forename: Ole
authors.initials: O
authors.lastname: Thorlacius-Ussing