THOUSAND OAKS (dpa-AFX) - Amgen (AMGN) and AstraZeneca (AZN) announced that AMAGINE-2, a pivotal, multi-arm Phase 3 trial evaluating two doses of brodalumab in more than 1,800 patients with moderate-to-severe plaque psoriasis, met its primary endpoints when compared with both Stelara (ustekinumab) and placebo at week 12.
Brodalumab 210 mg given every two weeks and the brodalumab weight-based analysis group were each shown to be superior to Stelara on the primary endpoint of achieving total clearance of skin disease, as measured by the Psoriasis Area Severity Index (PASI 100). When compared with placebo, a significantly greater proportion of patients treated with brodalumab achieved at least a 75 percent improvement from baseline in disease severity at week 12, as measured by the Psoriasis Area Severity Index (PASI 75).
A significantly greater proportion of patients treated with brodalumab also achieved clear or almost clear skin at week 12 compared with placebo, according to the static Physician Global Assessment (sPGA 0 or 1).
Amgen noted that results showed that 44.4 percent of patients in the brodalumab 210 mg group, 33.6 percent of patients in the brodalumab weight-based group, 25.7 percent of patients in the brodalumab 140 mg group, 21.7 percent of patients in the Stelara group and 0.6 percent of patients in the placebo group achieved total clearance of skin disease (PASI 100).
In addition, 86.3 percent of patients in the brodalumab 210 mg group, 77.0 percent of patients in the brodalumab weight-based group, 66.6 percent of patients in the brodalumab 140 mg group, 70.0 percent of patients in the Stelara group and 8.1 percent of patients in the placebo group achieved PASI 75.
All key secondary endpoints comparing brodalumab with placebo were met. The first key secondary endpoint comparing PASI 100 for brodalumab (140 mg) with Stelara at week 12 was numerically greater but not statistically significant (p=0.078). The remaining secondary endpoints against Stelara were also numerically greater (all nominal p-values were less than 0.05), but could not be deemed statistically significant due to the sequential testing method.
Psoriasis is a serious, chronic inflammatory disease that causes raised, red, scaly patches to appear on the skin, typically affecting the outside of the elbows, knees or scalp, though it can appear on any location. Approximately 125 million people worldwide have psoriasis and 80 percent of those patients have plaque psoriasis.
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