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PROVECTUS ANNOUNCES RESULTS FROM MECHANISM OF ACTION STUDY OF TOPICAL PH-10 FOR THE TREATMENT OF PSORIASIS

- Responses mediated by multiple pathways, including IL-17, IL-22 and interferons -
- Down-regulation of more than 500 disease-related genes; wide range of central "psoriasis-related" genes effectively normalized -

Thursday November 30, 2017

KNOXVILLE, TN., /Globe Newswire/ -- Provectus Biopharmaceuticals, Inc. (OTCQB: PVCT, www.provectusbio.com), ("Provectus" or the "Company"), a clinical-stage biotechnology company developing a novel therapeutic platform based on halogenated xanthenes for the treatment of multiple diseases, including cancer and inflammatory dermatoses, today announced that results from the Company’s mechanism of action ("MOA") study of PH-10 were presented at the 8th International Congress of Psoriasis: from gene to clinic ("Psoriasis G2C"), held in London, England from November 30th to December 2nd. This MOA work was undertaken by James Krueger, MD, PhD and other members of the Laboratory for Investigative Dermatology at The Rockefeller University. PH-10 is a topical hydrogel formulation that yields selective delivery of rose bengal disodium to epithelial tissues.

The MOA work used tissue biopsy specimens collected from participants in a multicenter study of subjects with mild to moderate psoriasis (NCT02322086). Patients applied a vehicle treatment each day for 28 consecutive days to plaque psoriasis on the central part of their bodies or extremities, and then applied PH-10 each day for 28 consecutive days to these same areas. Biopsies of one target plaque were collected at baseline (at least 7 days prior to first study treatment on Day 1), and then at Days 29 and 64 (with a 7-day interval between the biopsy at Day 29 and the commencement of PH-10 application on Day 36). Study data from each subject served as an internal control (i.e., non-lesional skin and plaque skin assessment at baseline and serial biopsies at the end of the applications of the vehicle and PH-10, respectively) to assess patients' clinical and cellular responses to PH-10.

Topical PH-10 Results from MOA Study Presented at Psoriasis G2C:

The vehicle treatment did not significantly alter the expression of core IL-17- or IL-23-modulated genes, or the overall disease transcriptome.
PH-10 treatment significantly down-regulated IL-17A, IL-22, IL-26, IL-36 and keratin 16 genes.
Pathways significantly improved by PH-10 treatment included published psoriasis transcriptomes and cellular responses mediated by IL-17, IL-22 and interferons.
PH-10 treatment also resulted in the downregulation of more than 500 disease-related genes. The expression of a wide-range of central "psoriasis-related" genes including IL-23, IL-17, IL-22, S100A7, IL-19, IL-36 and CXCL1 were effectively normalized to levels consistent with non-lesional skin.

Dominic Rodrigues, Chairman of the Company's Board of Directors, said, "This study has elucidated PH-10's novel mechanism of action for psoriasis and, combined with Provectus' prior clinical work in inflammatory dermatoses, reaffirmed our belief that the Company's therapeutic platform may now encompass psoriasis and also extend to other skin disorders. The immunologic response outcome that four weeks of topical PH-10 achieved in this study occurs with other topical or systemic drugs approved for psoriasis."

Mr. Rodrigues added, "We believe Dr. Krueger's foundational analysis of immune and psoriasis-related gene modulation by PH-10 confirms its clinical relevancy, albeit in a brief, four-week treatment regimen. This prior regimen was studied by Provectus in multiple Phase 1 and 2 clinical studies of psoriasis and atopic dermatitis comprising more than 200 patients; minimal adverse effects were observed and efficacy was evident in all metrics, such as psoriasis severity index, plaque response assessment, pruritus self-assessment, eczema area severity index, and investigator's global assessment."

Mr. Rodrigues concluded, "Provectus is now in the position to establish the full efficacy potential of topical PH-10. We are refining our clinical development program for dermatology to include longer administration of PH-10 that would allow for its direct comparison with both topical and systemic approved drugs."

A copy of the poster presentation is available on Provectus' website at http://www.provectusbio.com/media/docs/publications/PVCT_PG2C2017.pdf

The complete press release is available at http://www.provectusbio.com/news/press-releases/provectus-pr-20171130-1 on the Provectus website.