In the randomized, parallel group, double-blind trials, RE-COVER and RE-COVER II, patients with deep vein thrombosis and pulmonary embolism received dabigatran etexilate capsules 150 mg twice daily or warfarin (dosed to target INR of 2 to 3) following initial treatment with an approved parenteral anticoagulant for 5 to 10 days.
In RE-COVER, the median treatment duration during the oral only treatment period was 174 days. A total of 2,539 patients (30.9% patients with symptomatic PE with or without DVT and 68.9% with symptomatic DVT only) were treated with a mean age of 54.7 years. The patient population was 58.4% male, 94.8% white, 2.6% Asian, and 2.6% black. The concomitant diseases of patients in this trial included hypertension (35.9%), diabetes mellitus (8.3%), coronary artery disease (6.5%), active cancer (4.8%), and gastric or duodenal ulcer (4.4%). Concomitant medications included agents acting on renin-angiotensin system (25.2%), vasodilators (28.4%), serum lipid-reducing agents (18.2%), NSAIDs (21%), beta-blockers (14.8%), calcium channel blockers (8.5%), ASA (8.6%), and platelet inhibitors excluding ASA (0.6%). Patients randomized to warfarin had a mean percentage of time in the INR target range of 2.0 to 3.0 of 60% in RE-COVER study.
In RE-COVER II, the median treatment duration during the oral only treatment period was 174 days. A total of 2,568 patients (31.8% patients with symptomatic PE with or without DVT and 68.1% with symptomatic DVT only) were treated with a mean age of 54.9 years. The patient population was 60.6% male, 77.6% white, 20.9% Asian, and 1.5% black. The concomitant diseases of patients in this trial included hypertension (35.1%), diabetes mellitus (9.8%), coronary artery disease (7.1%), active cancer (3.9%), and gastric or duodenal ulcer (3.8%). Concomitant medications included agents acting on renin-angiotensin system (24.2%), vasodilators (28.6%), serum lipid-reducing agents (20%), NSAIDs (22.3%), beta-blockers (14.8%), calcium channel blockers (10.8%), ASA (9.8%), and platelet inhibitors excluding ASA (0.8%). Patients randomized to warfarin had a mean percentage of time in the INR target range of 2.0 to 3.0 of 57% in RE-COVER II study.
In studies RE-COVER and RE-COVER II, the protocol specified non-inferiority margin (2.75) for the hazard ratio was derived based on the upper limit of the 95% confidence interval of the historical warfarin effect. Dabigatran etexilate capsules was demonstrated to be non-inferior to warfarin (dosed to target INR of 2 to 3) (Table 13) based on the primary composite endpoint (fatal PE or symptomatic non-fatal PE and/or DVT) and retains at least 66.9% (RE-COVER) and 63.9% (RE-COVER II) of the historical warfarin effect, respectively.
Table 13 Primary Efficacy Endpoint for RE-COVER and RE-COVER II – Modified ITTa Population
| | Dabigatran etexilate capsules 150 mg twice daily N (%) | Warfarin N (%) | Hazard ratio vs warfarin (95% CI) |
| RE-COVER | N=1,274 | N=1,265 | |
| Primary Composite Endpointb | 34 (2.7) | 32 (2.5) | 1.05 (0.65, 1.70) |
| Fatal PEc | 1 (0.1) | 3 (0.2) | |
| Symptomatic non-fatal PEc | 16 (1.3) | 8 (0.6) | |
| Symptomatic recurrent DVTc | 17 (1.3) | 23 (1.8) | |
| RE-COVER II | N=1,279 | N=1,289 | |
| Primary Composite Endpointb | 34 (2.7) | 30 (2.3) | 1.13 (0.69, 1.85) |
| Fatal PEc | 3 (0.2) | 0 | |
| Symptomatic non-fatal PEc | 9 (0.7) | 15 (1.2) | |
| Symptomatic recurrent DVTc | 30 (2.3) | 17 (1.3) | |
aModified ITT analyses population consists of all randomized patients who received at least one dose of study medication.
bNumber of patients with one or more event.
cNumber of events. For patients with multiple events each event is counted independently.
In the randomized, parallel-group, double-blind, pivotal trial, RE-MEDY, patients received dabigatran etexilate capsules 150 mg twice daily or warfarin (dosed to target INR of 2 to 3) following 3 to 12 months of treatment with anticoagulation therapy for an acute VTE. The median treatment duration during the treatment period was 534 days. A total of 2,856 patients were treated with a mean age of 54.6 years. The patient population was 61% male, and 90.1% white, 7.9% Asian and 2% black. The concomitant diseases of patients in this trial included hypertension (38.6%), diabetes mellitus (9%), coronary artery disease (7.2%), active cancer (4.2%), and gastric or duodenal ulcer (3.8%). Concomitant medications included agents acting on renin-angiotensin system (27.9%), vasodilators (26.7%), serum lipid reducing agents (20.6%), NSAIDs (18.3%), beta-blockers (16.3%), calcium channel blockers (11.1%), aspirin (7.7%), and platelet inhibitors excluding ASA (0.9%). Patients randomized to warfarin had a mean percentage of time in the INR target range of 2.0 to 3.0 of 62% in the study.
In study RE-MEDY, the protocol specified non-inferiority margin (2.85) for the hazard ratio was derived based on the point estimate of the historical warfarin effect. Dabigatran etexilate capsules were demonstrated to be non-inferior to warfarin (dosed to target INR of 2 to 3) (Table 14) based on the primary composite endpoint (fatal PE or symptomatic non-fatal PE and/or DVT) and retains at least 63% of the historical warfarin effect. If the non-inferiority margin was derived based on the 50% retention of the upper limit of the 95% confidence interval, dabigatran etexilate capsules was demonstrated to retain at least 33.4% of the historical warfarin effect based on the composite primary endpoint.
Table 14 Primary Efficacy Endpoint for RE-MEDY – Modified ITTa Population
| | Dabigatran etexilate capsules 150 mg twice daily N=1,430 N (%) | Warfarin N=1,426 N (%) | Hazard ratio vs warfarin (95% CI) |
| Primary Composite Endpointb | 26 (1.8) | 18 (1.3) | 1.44 (0.78, 2.64) |
| Fatal PEc | 1 (0.07) | 1 (0.07) | |
| Symptomatic non-fatal PEc | 10 (0.7) | 5 (0.4) | |
| Symptomatic recurrent DVTc | 17 (1.2) | 13 (0.9) | |
aModified ITT analyses population consists of all randomized patients who received at least one dose of study medication.
bNumber of patients with one or more event.
cNumber of events. For patients with multiple events each event is counted independently.
In a randomized, parallel-group, double-blind, pivotal trial, RE-SONATE, patients received dabigatran etexilate capsules 150 mg twice daily or placebo following 6 to 18 months of treatment with anticoagulation therapy for an acute VTE. The median treatment duration was 182 days. A total of 1,343 patients were treated with a mean age of 55.8 years. The patient population was 55.5% male, 89% white, 9.3% Asian, and 1.7% black. The concomitant diseases of patients in this trial included hypertension (38.8%), diabetes mellitus (8%), coronary artery disease (6%), history of cancer (6%), gastric or duodenal ulcer (4.5%), and heart failure (4.6%). Concomitant medications included agents acting on renin-angiotensin system (28.7%), vasodilators (19.4%), beta-blockers (18.5%), serum lipid reducing agents (17.9%), NSAIDs (12.1%), calcium channel blockers (8.9%), aspirin (8.3%), and platelet inhibitors excluding ASA (0.7%). Based on the outcome of the primary composite endpoint (fatal PE, unexplained death, or symptomatic non-fatal PE and/or DVT), dabigatran etexilate capsules was superior to placebo (Table 15).
Table 15 Primary Efficacy Endpoint for RE-SONATE – Modified ITTa Population
| | Dabigatran etexilate capsules 150 mg twice daily N=681 N (%) | Placebo N=662 N (%) | Hazard ratio vs placebo (95% CI) |
| Primary Composite Endpointb | 3 (0.4) | 37 (5.6) | 0.08 (0.02, 0.25) p-value <0.0001 |
| Fatal PE and unexplained deathc | 0 | 2 (0.3) | |
| Symptomatic non-fatal PEc | 1 (0.1) | 14 (2.1) | |
| Symptomatic recurrent DVTc | 2 (0.3) | 23 (3.5) | |
aModified ITT analyses population consists of all randomized patients who received at least one dose of study medication.
bNumber of patients with one or more events.
cNumber of events. For patients with multiple events each event is counted independently.