title: Symptomatic venous thromboembolism in cancer patients treated with chemotherapy: an underestimated phenomenon.
abstract: BACKGROUND
  The exact incidence of venous thromboembolism (VTE) in cancer patients is unknown, partly because of confounding factors. Prophylactic treatment is warranted in surgical patients with cancer because of a high incidence of VTE. We performed a retrospective study to evaluate if the same applies for cancer patients treated with chemotherapy.
  
  
  METHODS
  The medical records of 206 consecutive patients with malignancy, treated with chemotherapy, were identified. The kind of malignancy and chemotherapeutic treatment were recorded, as was the date of treatment. The records were reviewed for other risk factors for VTE, and were searched for proved deep venous thrombosis or pulmonary embolism.
  
  
  RESULTS
  Of those 206 patients, 15 (7.3%) had proved VTE during or within 3 months after chemotherapeutic treatment. The annual incidence was 10.9%. The incidence of VTE was specifically high in the 39 patients treated with a combination of fluorouracil and leucovorin calcium because of colorectal cancer (6 [15%] of the patients were affected). The occurrence of VTE in the latter group of patients was not influenced by factors such as surgery, central venous catheters, or tumor load.
  
  
  CONCLUSIONS
  The annual incidence of VTE in patients treated with chemotherapy was high, specifically in patients with colorectal cancer treated with fluorouracil-leucovorin. If these observations are confirmed, trials to evaluate the use of prophylactic anticoagulant treatment should be conducted.
authors.affiliation: Department of Medical Oncology, Academic Medical Center, Amsterdam, The Netherlands. j.m.otten@amc.uva.nl
authors.forename: Hans-Martin M B
authors.initials: HM
authors.lastname: Otten
authors.forename: Joost
authors.initials: J
authors.lastname: Mathijssen
authors.forename: Hugo
authors.initials: H
authors.lastname: ten Cate
authors.forename: Marcel
authors.initials: M
authors.lastname: Soesan
authors.forename: Marijke
authors.initials: M
authors.lastname: Inghels
authors.forename: Dick J
authors.initials: DJ
authors.lastname: Richel
authors.forename: Martin H
authors.initials: MH
authors.lastname: Prins
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects*; D001132:Arm / Q000098:blood supply; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D007866:Leg / Q000098:blood supply; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications / Q000188:drug therapy*; D009426:Netherlands / Q000453:epidemiology; D011655:Pulmonary Embolism / Q000139:chemically induced / Q000453:epidemiology; D012042:Registries; D012170:Retinal Vein Occlusion / Q000139:chemically induced / Q000453:epidemiology; D012189:Retrospective Studies; D020246:Venous Thrombosis / Q000139:chemically induced* / Q000453:epidemiology*