The positive opinion relates to the use of enzalutamide for the treatment of adult men with metastatic castrate-resistant prostate cancer (mCRPC) who are asymptomatic or mildly symptomatic after failure of androgen-deprivation therapy in whom chemotherapy is not yet clinically indicated.
“For us urologists treating patients with mCRPC, this positive opinion from the CHMP is an important milestone towards making enzalutamide available across Europe. Enzalutamide marks a significant step for many patients who live with mCRPC as encouraging, it demonstrates benefits in overall survival, has a positive impact on quality of life and has been shown to be well tolerated”, said Professor Bertrand Tombal, European Principal Investigator for PREVAIL.
“As well as clear efficacy and safety benefits over placebo, enzalutamide has the additional advantage of not requiring steroids to be taken concomitantly and requires only basic monitoring, making it a simple option for both healthcare professionals and patients. It is my hope that the European Commission follows this opinion, providing us with a viable new treatment option for those patients not suitable for chemotherapy.”
The positive CHMP opinion is based on results from the phase III PREVAIL study which showed that men treated with enzalutamide demonstrated a statistically significant reduction both in the risk of death and a delay in cancer progression and the time to initiation of chemotherapy as compared to those treated with placebo.
Enzalutamide reduced the risk of death by 29% (HR=0.71; p<0.001), compared with placebo. In addition, treatment with enzalutamide significantly reduced the risk of radiographic progression or death by 81% compared with placebo treatment (HR=0.19; p<0.001). Men taking enzalutamide experienced a 17-month delay in the time to initiation of chemotherapy compared with men taking placebo (28.0 months versus 10.8 months; HR=0.35; p<0.0001).
The most common clinically relevant adverse events among the enzalutamide population as compared with placebo-treated patients in the PREVAIL trial included fatigue, hot flush and hypertension. Hypertension was observed in 13% of enzalutamide versus 4% of placebo-treated patients. Grade 3 or higher cardiac adverse events were reported in 3% of enzalutamide versus 2% of placebo-treated patients. One patient (0.1%) out of the 871 patients treated with enzalutamide, and one patient (0.1%) receiving placebo experienced a seizure.
XTANDI is currently licensed in Europe for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy.3 Marketing authorisation was granted by the European Commission in June 2013.