Rivaroxaban
SAN DIEGO—In the phase 3 CASSINI trial, prophylaxis with rivaroxaban reduced the rate of venous thromboembolism (VTE) and VTE-related death in high-risk ambulatory cancer patients receiving systemic therapy.
The reduction in VTE and related death was not statistically significant in the primary analysis, which included a period of time after treatment had stopped.
However, the reduction in VTE and related death was significant in a prespecified secondary analysis limited to the on-treatment period.
Alok A. Khorana, MD, of the Cleveland Clinic in Ohio, presented these results at the 2018 ASH Annual Meeting (abstract LBA-1).
The trial (NCT02555878) included 841 patients enrolled at 143 centers in 11 countries. The patients had solid tumor malignancies or lymphomas and a high risk of VTE (Khorana score of 2 or greater).
The patients were randomized to either rivaroxaban at 10 mg once daily (n=420) or placebo once daily (n=421).
In the primary analysis period of 180 days, the composite endpoint of VTE or VTE-related death occurred in 5.95% of the rivaroxaban-treated group and 8.79% of the placebo group (hazard ratio [HR]=0.66; 95% confidence interval [CI], 0.40-1.09; P=0.101).
However, 177 patients (43.7%) in the rivaroxaban group stopped treatment before the 180-day mark, as did 203 patients (50.2%) in the placebo group.
In a prespecified secondary analysis looking only at the treatment period, rivaroxaban did significantly reduce the risk of VTE and VTE-related death, Dr. Khorana said. The composite endpoint occurred in 2.62% of rivaroxaban-treated patients and 6.41% of placebo-treated patients in that analysis (HR=0.40; 95% CI, 0.20-0.80; P=0.007).
Rates of major bleeding and clinically relevant nonmajor bleeding were not significantly different between the groups.
Major bleeding occurred in 1.98% (n=8) of rivaroxaban-treated patients and 0.99% (n=4) of placebo-treated patients (HR=1.96, 0.59-6.49; P=0.265).
Clinically relevant nonmajor bleeding occurred in 2.72% (n=11) and 1.98% (n=8), respectively (HR=1.34, 95% CI, 0.54-3.32; P=0.532).
CASSINI was sponsored by Bayer and Janssen. Dr. Khorana reported relationships with Janssen, Pharmacyclics, PharmaCyte, TriSalus Life Sciences, PAREXEL, Pfizer, Sanofi, Halozyme, Seattle Genetics, AngioDynamics, LEO Pharma, Medscape/WebMD, and Bayer.