Kakkar 2010.

Methods	RCT, double‐blinded, placebo‐controlled, venography.
Participants	Patients undergoing elective, open, curative or palliative surgery for malignant disease of the gastrointestinal (excluding esophagus) tract, genitourinary tract or female reproductive organs.
Interventions	LMWH (bemiparin 3500 IU, total treatment period of 24 to 32 days), or placebo.
Outcomes	LMWH 248 Placebo 240
Notes	CANBESURE trial. Follow‐up 74 to 90 days after randomization. Follow‐up complete. All patients were scheduled for bilateral venography. Adequate definitions of VTE and bleeding complications were described in the paper. Venography performed on day 18 to 22, two days before the last LMWH injection.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated allocation.
Allocation concealment (selection bias)	Unclear risk	Not described in the manuscript.
Blinding (performance bias and detection bias) All outcomes	Low risk	Double‐blind, placebo‐controlled. All deaths and symptomatic VTE events centrally evaluated by independent blinded committee. Venograms blinded and centrally evaluated by independent committee. Bleeding events adjudicated by an independent data safety monitoring board.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Placebo injection 0.9% sodium chloride, 0.2 mL.
Incomplete outcome data (attrition bias) All outcomes	High risk	Sixty‐seven (21.3%) patients in experimental group, 70 (22.6%) patients excluded due to inadequate venography.
Selective reporting (reporting bias)	Unclear risk	Modified intention‐to‐treat population, included all randomized patients who received at least one dose of randomized treatment and had an assessable venogram, or documented symptomatic VTE, or died during the double‐blind period.
Other bias	Low risk	The study appears to be free of other sources of bias.