KemPharm Announces Top Line Results from KP415.E01 Efficacy and Safety Trial in Children With ADHD
Results from Single Classroom-Style Trial Met Pre-Specified Primary and Secondary Endpoints
Conference Call and Live Audio Webcast with Slide Presentation Scheduled for Today at
The trial was a multicenter, randomized, parallel, double-blind, placebo-controlled analog laboratory classroom clinical trial in 150 children aged 6-12 years old with a diagnosis of ADHD to assess the efficacy and safety of KP415. Subjects who received KP415 met the trial’s primary and secondary efficacy endpoint, showing statistically significant improvement on both the Swanson, Kotkin, Agler, M-Flynn, and Pelham Scale (SKAMP) and the Permanent Product Measure of Performance (PERMP) scale.
“We are pleased with these top line results from our pivotal trial of KP415. The trial met its pre-specified primary endpoint, which is the mean difference in the SKAMP-Combined score change from baseline across all post-dose time points,” said
“The SKAMP-C change from pre-randomization baseline was selected to mitigate a potential carryover effect related to the pharmacokinetics of KP415 and an assumption that placebo should have been more predictable, neither of which actually occurred,” added Mickle. “As a result, the endpoint analysis led to an inability to correct for a change of SKAMP-C scores in the placebo group across the analog classroom day. When this bias is accounted for, a similar statistical analysis (post-hoc) of SKAMP-C scores also supports efficacy of KP415 from 0.5 to 13 hours post-dose.”
“We anticipate developing additional clinical data for KP415 throughout 2018, including the completion of our ongoing oral and intranasal Human Abuse Potential studies,” Mickle concluded. “We believe that completing the analysis of the full data set from KP415.E01 trial and these other studies will allow us to submit our New Drug Application for KP415 with the
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About the KP415.E01 Trial
The KP415 capsules contain two active pharmaceutical ingredients: d-MPH hydrochloride as the immediate release (IR) d-MPH component, and serdexmethylphenidate (SDX), a prodrug of d-MPH that provides the extended duration component. In terms of d-MPH equivalent amounts, all capsule strengths contain 30% of d-MPH (IR component) and 70% of d-MPH from SDX. Subjects in this trial received daily oral doses (1 capsule/day) of either 28/6 mg SDX/d-MPH, 42/9 mg SDX/d-MPH, or 56/12 mg SDX/d-MPH, corresponding to equivalent d-MPH amounts of 20, 30 and 40 mg, respectively. The dose of KP415 was optimized during a 3-week dose optimization phase with open-label KP415 capsules. After completion of the dose optimization period, subjects were randomized to 7 days of double-blind treatment with their optimized dose of KP415 or matching placebo.
The efficacy evaluation was based on SKAMP and PERMP scores pre-dose, and at 0.5, 1, 2, 4, 8, 10, 12 and 13 hours post-dose during a full laboratory classroom day at Visit 6 (at the end of the seven-day treatment period). The baseline SKAMP score was measured pre-dose at Visit 5 (immediately prior to randomization and the first dose in the seven-day treatment period) due to potential concerns of carryover of methylphenidate into the Visit 6 classroom day which would have disadvantaged KP415, as well as an assumption that placebo would not significantly change from Visit 5 to Visit 6. A post-hoc analysis was conducted using the baseline SKAMP scores measured at pre-dose Visit 6. The SKAMP is a validated rating of classroom behaviors in children with ADHD; the PERMP is an adjusted math test designed to assess attention in children with ADHD through a subject’s ability to initiate, self-monitor, and complete the test.
The study met the primary endpoint of mean SKAMP-C change from baseline score (pre-dose Visit 5 as baseline) across all post-dose time points (Visit 6): The least-squares mean post-dose SKAMP-C difference from baseline (150 subjects) was higher for placebo than for KP415 (0.54 vs. -4.87, respectively; p<0.001), indicating fewer ADHD symptoms with KP415 therapy than with placebo.
Using pre-dose Visit 5 as baseline (pre-specified), the SKAMP-C change from baseline was statistically significantly better (p<0.001) with KP415 versus placebo from 1–10 hours post-dose; using pre-dose Visit 6 as baseline (post-hoc), the SKAMP-C change from baseline was statistically significantly better (p<0.01) with KP415 versus placebo from 0.5–13 hours post-dose.
The PERMP-A and PERMP-C scores (secondary endpoints) support the primary endpoint conclusion overall (mean changes; p<0.01) and showed statistically significantly better performance with KP415 versus placebo at each time point from 0.5-13 hours (p<0.05).
The observed AEs were mild to moderate in severity and were typical of those seen in other stimulant trials. No serious adverse events were reported.
KP415 – Prodrug Composition of d-MPH for ADHD
KP415 is KemPharm’s d-MPH prodrug composition product candidate designed for the broad treatment needs of the ADHD population.
Caution Concerning Forward Looking Statements
This press release may contain forward-looking statements made in reliance upon the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include all statements that do not relate solely to historical or current facts and can be identified by the use of words such as “may,” “will,” “expect,” “project,” “estimate,” “anticipate,” “plan,” “believe,” “potential,” “should,” “continue” or the negative versions of those words or other comparable words. These forward-looking statements include statements regarding the expected features and characteristics of KemPharm’s product candidates, including KP415, as well as the expected timing of the completion of any clinical trials or studies related to KP415 and the expected timing of the NDA submission for KP415. These forward-looking statements are not guarantees of future actions or performance. These forward-looking statements are based on information currently available to
|Investor Contacts:||Media Contact:|
|Jason Rando / Joshua Drumm, Ph.D.
Tiberend Strategic Advisors, Inc.
212-375-2665 / 2664
|Daniel L. Cohen
Executive VP, Government and Public Relations