Screening for Occult Malignancy in Patients With Idiopathic Venous Thromboembolism

Summary

Blood clots in leg veins (deep vein thrombosis) or lung arteries (pulmonary embolism) that happen for no reason (i.e. unexplained) are both called "unprovoked venous thromboembolism" (VTE). These unexplained blood clots can be the first symptom of cancer. Up to 10% of patients with unexplained blood clots will be diagnosed with cancer within one year of their blood clot diagnosis.

These cancers can be found anywhere in the body although the relationship appears stronger with the pancreas, ovary and liver. Cancer testing in patients with blood clots is controversial. There is presently a wide variety of expert opinions and practices. Previous studies showed that a limited cancer screen including a medical history, physical examination, basic blood work and chest X-ray, will find about 90% of cancers. More recent and better designed studies showed that the limited cancer screen misses many cancers and needs to be improved. More extensive cancer testing may find more cancers but is potentially uncomfortable for patients, costs a lot of money and involves a lot of people.

The "comprehensive computed tomography" is less uncomfortable, inexpensive, radiological test made to find many cancers at once. Thus, the scientific question to be asked is: Does a "comprehensive computed tomography" miss less cancers than a limited cancer screen in patients with blood clots?

The main goal of this study is to find out if a "comprehensive computed tomography" misses less cancers than a limited cancer screen in patients with unexplained blood clots.

The second goal of the study is 1) to find out if a "comprehensive computed tomography" finds more "curable" cancers than the limited cancer screen; 2) to find out if the patients diagnosed with cancer are still alive and cancer-free after one year (i.e. the patients with curable cancer were treated and are doing well); 3) to prove that a negative "comprehensive computed tomography" means that the patient will not have cancer and; 4) to find out if a "comprehensive computed tomography" is well tolerated and safe for patients.

Conditions

• Venous Thromboembolism
• Deep Vein Thrombosis
• Pulmonary Embolism

Interventions

DEVICE

Comprehensive computed tomography of the abdomen/pelvis

Virtual colonoscopy and gastroscopy, a biphasic enhanced CT for hepatoma and renal cell carcinoma, parenchymal pancreatogram with minimum intensity projection (MinIP) reformation for pancreatic carcinoma, and finally uniphasic enhanced CT of distended bladder for bladder and ovarian carcinomas.

OTHER

Limited Malignancy Screening

1\) A complete medical history and physical examination; 2) complete blood count; 3) liver function tests (AST, ALT, ALP, bilirubin, LDH); 4) renal function test (creatinine); 5) chest X-ray (if not performed in the past year) In women, a pap smear/pelvic examination (if \> 18 and \< 70 years old and not performed during the past year),a mammogram (\> 50 years old) will be performed if not conducted in last year. Similarly for men, prostate examination +/- PSA testing (\>40 years old) will be performed if not conducted in the past year.

Sponsors & Collaborators

• Ottawa Hospital Research Institute

  lead OTHER

Principal Investigators

• Marc Carrier, MD MSc FRCPC · The Ottawa Hospital Research Institute

Study Design

Allocation

RANDOMIZED

Purpose

SCREENING

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2008-09-30

Primary Completion

2015-04-30

Completion

2015-04-30

Countries

• Canada

Study Locations