Summary
Already since the early 1800s, it has been recognised that malignancies may provoke
thromboembolic complications, and indeed cancer patients are at increased risk of
developing venous thrombosis. Interestingly, case control studies of deep-vein thrombosis
suggested that low-molecular-weight heparin (LMWH) improved survival of cancer patients.
This led to the hypothesis that cancer cells might ‘take advantage’ of a hypercoagulable
state to more efficiently metastasise. Initial randomised placebo control trials showed
that LMWH improve overall survival of cancer patients, especially in those patients
with a relatively good prognosis. The failure of recent phase III trials, however,
tempers enthusiasm for anticoagulant treatment in cancer patients despite an overwhelming
body of literature showing beneficial effects of anticoagulants in preclinical models.
Instead of discarding LMWH as potential (co)treatment modality in cancer patients,
these disappointing recent trials should guide future preclinical research on anticoagulants
in cancer biology. Most and for all, the underlying mechanisms by which coagulation
drives tumour progression need to be elucidated. This could ultimately allow selection
of cancer patients most likely to benefit from anticoagulant treatment and/or from
targeted therapy downstream of coagulation factor signalling.
Keywords
Blood coagulation - heparin - low-molecular-weight - patient selection - receptors
- proteinase-activated - neoplasms