Provectus Pharmaceuticals, Inc. (OTCBB:PVCT,http://www.pvct.com), a development-stage oncology and dermatology biopharmaceutical company, announced top-line data for the company's randomized controlled trial (RCT) of PH-10 for mild-to-moderate plaque psoriasis.
The Phase 2 trial (protocol PH-10-PS-23) compared safety and efficacy of three dose levels of PH-10 (0.002% Rose Bengal, 0.005% Rose Bengal and 0.01% Rose Bengal) against vehicle. Ninety-nine subjects with mild-to-moderate plaque psoriasis of the trunk and/or extremities were randomized to one of the four study arms and applied their assigned test article once daily for 28 consecutive days. Subjects were assessed weekly during the treatment interval, and returned one week and four weeks after their final application for final assessment of safety and efficacy. Efficacy was assessed using the Psoriasis Severity Index (PSI), the Plaque Response Assessment scale, and the Pruritus (itching) Self Assessment scale. Similarity of the patient population, study events schedule and study assessments allows results from the randomized trial to be compared side-by-side with those of a prior single-arm trial of PH-10 using a lower dose level (protocol PH-10-PS-22, which used PH-10 at 0.001% Rose Bengal). The study began in December 2010 and was completed in August 2011, with final data collection for primary outcome completed in February 2012.
Results for all three efficacy parameters showed improvement in psoriasis symptoms over the treatment interval, with the low dose of PH-10 (0.002%) providing uniformly consistent improvement, while reduced therapeutic activity was observed at the two higher doses. Response for PH-10 at 0.002% Rose Bengal was comparable to that observed previously using PH-10 at 0.001% Rose Bengal. After 28 days of treatment with PH-10 (all strengths), 23-29% of subjects achieved complete or nearly complete resolution of all PSI component symptoms (erythema, induration and desquamation), compared to no subjects in the vehicle arm. Thirty eight percent of subjects receiving the low dose of PH-10 reported no itching after 28 days compared with 14% of those receiving vehicle (45% of subjects receiving 0.001% Rose Bengal in the earlier study reported no itching after 28 days). PH-10 at 0.002% and 0.005% (along with 0.001% in the prior study) exhibited maximum improvement in Plaque Response Assessment, with the improvements for 0.002% achieving high significance (p < 0.001) after two weeks of treatment; all strengths proved superior to vehicle after 28 days, with the highest strength exhibiting the least activity. As noted in prior studies, PH-10 was generally well tolerated with only transient mild to occasionally moderate adverse experiences limited to the application site.
Dr. Craig Dees, Ph.D., CEO of Provectus said, "We are excited by the positive data reported for this randomized trial of PH-10. Despite the complexity of this four-arm study, we are pleased that it clearly showed that the low dose level was optimal of the three doses tested, with similar activity to that seen in our earlier single-arm trial, and that it was superior to vehicle. These important results provide us with powerful data to guide us as we ramp up our development efforts. We expect the data from this randomized study will eventually lead to a term sheet for a proposed licensing agreement which will trigger the engagement of a financial advisor to assist us with that transaction."
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