Thromboprophylaxis for Patients Undergoing Surgical Resection for Colon Cancer

Inclusion Criteria:

* Males or females aged 18 years or older with a pathologically confirmed localized invasive colorectal cancer and no evidence of metastatic disease who are scheduled to undergo surgical resection will be eligible.
* All study patients must be enrolled at least two weeks prior to scheduled surgery and provide written informed consent.
* All the following criteria must be met to be eligible:

  1. Pathological confirmation of an invasive adenocarcinoma of the colon;
  2. No evidence of metastatic disease by Computed Tomography (CT) scan of the abdomen and pelvis or chest X-ray (CXR). A Magnetic Resonance Imaging (MRI) of the abdomen and pelvis will be used if the patient has a documented contrast allergy or to verify a questionable finding on the CT scan. Any abnormal findings on CXR will be investigated with a CT scan of the chest. Imaging must be performed within 2 months of randomization;
  3. a scheduled surgical operation for resection of the colon cancer; and
  4. ECOG performance status 0 or 1.

Exclusion Criteria:

* Subjects cannot be included in this study if any of the following criteria apply:

  1. rectal adenocarcinoma (defined as tumor below the peritoneal reflection or within 12 cm of the anal verge by rigid sigmoidoscopy);
  2. prior VTE including deep vein thrombosis (DVT) or pulmonary embolism (PE);
  3. requirement for full dose perioperative anticoagulation;
  4. requirement for anti-platelet or anti-inflammatory therapy that cannot be discontinued;
  5. contraindication to heparin therapy \*\*;
  6. geographic inaccessibility (less likely to comply with required follow-up visits and care);
  7. participating in another interventional trial that may result in co-intervention or contamination (to be determined by PI);
  8. \< 18 years of age;
  9. history of other malignancies (except for adequately treated basal or squamous cell carcinoma or carcinoma in situ) within 5 years of the colorectal cancer diagnosis;
  10. treatment, including radiation therapy, chemotherapy or targeted therapy, administered for the currently diagnosed colon cancer prior to randomization;
  11. pregnant or lactating; and
  12. unable/unwilling to providing informed consent.