AMGN's Enbrel would be about 60% effective in psoriasis. <A HREF="http://www.psoriasis.org/research/biologics/enbrel.php" target="_new">http://www.psoriasis.org/research/biologics/enbrel.php</A> After six months (24 weeks) of the same treatment regimen, three out of five patients (59 percent) reached the 75 percent improvement mark.