Summary
After a proximal deep-vein thrombosis (P-DVT), the risk of diagnosis of a previously
unsuspected cancer is high. Isolated distal DVT (iDDVT; i.e. infra-popliteal DVT without
pulmonary embolism [PE]) and isolated superficial-vein thrombosis (iSVT; i.e. without
concomitant DVT and PE) are at least as frequent as P-DVT but their association with
subsequent cancer is uncertain. We exploited data from the OPTIMEV prospective, observational,
multicentre study to i) compare the risk of subsequent cancer three years after a
first objectively confirmed iSVT, iD-DVT and iP-DVT in patients without a prior history
of cancer or of venous thromboembolism, ii) assess predictors of subsequent cancer
in cases of iD-DVT. The overall cumulative rates of cancer among the 304 patients
with iSVT, 536 patients with iD-DVT, and 327 patients with iP-DVT were similar (3.4%
95% confidence interval [1.8–6.2], 3.9% [2.5–5.9] and 3.9% [2.3–6.8], respectively),
regardless of whether the index venous thromboembolic event was unprovoked or associated
with a major transient risk factor. Neither anatomical (muscular vs deep-calf DVT)
nor ultrasound scan characteristics (number of thrombosed veins, clot diameter under
compression) seemed strongly associated with the risk of cancer in cases of iD-DVT.
In patients managed in routine practice, all the different clinical expressions of
lower limb venous thromboembolism are associated with a similar risk of subsequent
cancer. From a clinical practice point of view, this suggests that cancer screening,
without discussing the necessity, or not, of such screening, should not differ between
a deepproximal, deep-distal or superficial location of thrombosis.
Note: Part of this study was presented as an oral presentation at the 54th American
Society of Hematology Annual Meeting, 8 to 11 December 2012, Atlanta, GA, USA.
Keywords
Epidemiological studies - cancer - venous thrombosis - risk factors - ultrasound analysis