Shire's Investigational Nonstimulant ADHD Treatment INTUNIV(TM) (Guanfacine Extended Release) Demonstrated Significant Efficacy in Reducing ADHD Symptoms at All Measured Time Points Up to 24 Hour...( WASHINGTON May 7 /- Shire plc (LS...),Health

WASHINGTON, May 7 /PRNewswire-FirstCall/ -- Shire plc (LSE: SHP, Nasdaq: SHPGY), the global specialty biopharmaceutical company, presented today at a major scientific meeting findings from analyses of pivotal trial results of INTUNIV, a selective alpha-2A-agonist. This compound is an investigational once-daily medication, which is being evaluated for the treatment of the symptoms of Attention Deficit Hyperactivity Disorder (ADHD). The data demonstrated that INTUNIV showed significant efficacy in reducing ADHD symptoms for patients taking the medication when compared to patients taking placebo at all measured time points up to 24 hours postdose.

The U.S. Food and Drug Administration (FDA) issued an approvable letter on June 20, 2007, regarding INTUNIV. Shire is conducting additional clinical work which is designed to enhance the label. Upon approval, INTUNIV will be the first selective alpha-2A receptor agonist indicated for the treatment of ADHD that may provide an important treatment option for patients and physicians.

Summary of Analyses

The pooled analysis evaluated results from these patients on a weight adjusted mg/kg basis from two similarly designed, randomized, double-blind, forced-dose titration, multicenter phase III trials. The primary efficacy measure for both studies was change in the ADHD Rating Scale (ADHD-RS-IV) total score from baseline to endpoint. All patient groups treated with INTUNIV showed significantly greater improvement in ADHD-RS-IV total score from baseline to endpoint than the placebo group (P<.001). The ADHD-RS-IV is a standardized, validated test for assessing symptoms of ADHD and for assessing their response to treatment.

The analysis also studied duration of effect using the Conners' Parent Rating Scale-Revised Short Form (CPRS-R), which is a comprehensive scale that used observer and self-report ratings to help assess ADHD and evaluate behavioral issues in children and adolescents. The CPRS-R asses
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