Primary Risk Drivers
Below is a snapshot of domains that materially influence the MARA Rating.
Clinical effectiveness
The evidence from the ROCKET-AF trial demonstrates moderate benefit of rivaroxaban over warfarin, showing non-inferiority in preventing stroke and systemic embolism. The hazard ratios indicate a significant reduction in risk, particularly in certain subgroups, although superiority was not consistently demonstrated across all analyses. The trial’s design and results support a moderate therapeutic advantage.
Cost effectiveness
The base-case ICER of £18,883 per QALY gained indicates that rivaroxaban is cost-effective compared to warfarin, particularly in populations with poorly controlled INR. The probabilistic sensitivity analysis suggests a high probability of cost-effectiveness under common thresholds, supporting its economic value.
Quality of life
While the ROCKET-AF trial did not include a generic measure of HRQoL, the evidence suggests that rivaroxaban may improve quality of life by reducing the burdens associated with warfarin, such as frequent monitoring and dietary restrictions. The potential for improved adherence and patient satisfaction supports a moderate gain in HRQoL.
Supporting Domains
Safety and Adverse Effects
Rivaroxaban has a comparable safety profile to warfarin, with no significant differences in major bleeding events. The trial indicated a lower rate of intracranial hemorrhage, which is a critical safety consideration. While gastrointestinal bleeding was higher, the overall safety profile is acceptable.
Comparator Selection
The ROCKET-AF trial compared rivaroxaban directly with warfarin, which is the standard of care for atrial fibrillation. Additionally, the manufacturer conducted a network meta-analysis including relevant comparators like dabigatran and aspirin, enhancing the robustness of the evidence.
Patient Population and Subgroups
The trial population is broadly representative of patients with atrial fibrillation, including various risk factors. Subgroup analyses were conducted, providing insights into different demographics, although the very small number of patients with lower CHADS2 scores raises some concerns about generalizability.
Care Pathway Integration
Rivaroxaban can be integrated into existing care pathways with minimal disruption, as it does not require the same level of monitoring as warfarin. This ease of integration supports its adoption in clinical practice, particularly for patients who struggle with warfarin management.
Resource Use and Cost Implications
The economic analysis indicates that rivaroxaban may lead to lower overall healthcare costs due to reduced monitoring needs and potential for better adherence. The cost implications are manageable and align with the expected benefits, supporting its use in practice.
Evidence Quality and Robustness
The evidence is derived from a well-conducted Phase III RCT (ROCKET-AF) with a large sample size and robust design. While there are some limitations regarding generalizability and the use of safety-on-treatment populations, the overall quality of evidence is strong.
Uncertainty, Sensitivity, and Broader Impacts
While there are uncertainties regarding the generalizability of trial results to the broader UK population, the context of unmet need and the potential for improved quality of life mitigate some of these concerns. The analysis indicates manageable uncertainty.
