PLEXOVAL exosome wound healing human study starts – Exopharm Limited

26 August 2019

Melbourne, Australia: Regenerative medicine company Exopharm Limited (ASX:EX1) announces the start of the PLEXOVAL Phase 1 study, the first human clinical trial using exosomes for wound healing.

This is an important step forward as a clinical stage company and world leader in exosome therapeutics for regenerative medicine.

All regulatory and site approvals have been obtained and sites are currently preparing for the initiation of recruitment and dosing.

Exopharm was recently granted Human Research Ethics Committee approval to commence the PLEXOVAL wound healing study with its Plexaris™ (exosomes from platelets) product. The trial is approved under the Australian Clinical Trials Notification (CTN) scheme. This first-in-human clinical trial will investigate autologous (from the same person) Plexaris (exosomes from blood platelets) administered once by local injection. The study will track participants over 42 days from dosing. Cohort 1 involves up to 15 participants and Cohort 2 involves up to 5 participants.

The main readouts of the PLEXOVAL study will be safety, wound closure and scarring.

The PLEXOVAL study involves two sites; the Royal Melbourne Hospital and the Australian Red Cross Blood Service.

The principal investigator of the study is Associate Professor Johannes Kern MD, PhD, FEBDV, FACD of the Dermatology Department, Royal Melbourne Hospital. The principal investigator is a practicing dermatologist and dermatopathologist and a Fellow of Australasian College of Dermatologists.

The study is being facilitated by Accelagen, a Melbourne based Contract Research Organisation (CRO).

Dr Ian Dixon, Exopharm’s Founder CEO and Managing Director said “Wounds and poor wound healing are medical problems affecting thousands of Australians every year. As we age our ability to heal declines and the prevalence of chronic wounds increases. Exosomes from platelets have been shown in animal studies to improve wound closure and reduce scarring. This human study is looking at whether our Plexaris product might become a useful improved treatment option.”

“This PLEXOVAL study positions Exopharm as a leader in the cell-free exosome field of regenerative medicine world-wide. Our LEAP Technology allows us to manufacture an exosome product that has the properties a pharmaceutical company would look for. The main purpose of this small study is to demonstrate safety of the product and potentially show signs of efficacy.”

Exopharm is manufacturing the Plexaris product at its Fitzroy manufacturing facility.

PLEXOVAL study outline:

The PLEXOVAL study is a first-in-human prospective open-label, single dose study to evaluate the safety, tolerability and biological activity of platelet-derived extracellular vesicles for the augmentation of wound healing.

The PLEXOVAL study is a Phase 1 study and is primarily assessing the safety of Plexaris. Secondary outcomes will investigate signals of benefits in wound closure, wound strength, wound histology and scar formation.

PLEXOVAL stands for Prospective open-Label, single dose proof of concept study to Evaluate the safety, tolerability and biological activity of Platelet-derived EXtracellular Vesicles, on the augmentation of wOund healing rate and effect on scar formation following skin punch biopsy in healthy Volunteer AduLts.

Exopharm has contracted the Australian Red Cross Blood Service to collect platelets from the study participants at a regular Donor Centre. The platelets will be tested at the Blood Service’s Melbourne Processing centre and transferred to the Exopharm Manufacturing site. Exopharm will process them using the LEAP Technology in a sterile biologics manufacturing facility to produce each patient’s individual (autologous) Plexaris product. Participants will then visit the Royal Melbourne Hospital and have Plexaris administered by injection under oversight by the principal investigator Associate Professor Johannes Kern. Following treatment, participants will be assessed over a 42-day period and study results will be entered into a data management system for later analysis.

A study report will be provided to Exopharm, expected sometime before mid CY ’20.

Further details of the PLEXOVAL study can be found in Appendix A here.

Company and Media Enquiries:

Dr Ian Dixon, MBA
Founder and Managing Director
P: +61 (0)3 9111 0026

Join our mailing list to receive updates:
P: +61 (0)3 9111 0026

Rudi Michelson
Monsoon Communications
Tel: +61 (0)3 9620 3333


Exopharm Limited (“Exopharm” or the “Company”) (ASX:EX1) is a clinical stage Australian regenerative medicine biopharmaceutical company seeking to develop and commercialise exosomes as therapeutic agents – initially a product called Plexaris™ and later a product called Exomeres™.

These products are exosomes that are derived from human platelets in relation to Plexaris, and adult stem cells in relation to Exomeres, and purified using the LEAP Technology and referred to as biologic products.

As its primary focus, Exopharm aims to be a leader in the field of human therapeutics using exosomes as regenerative medicine products for heath span related conditions.

The Development Program: The Company’s main objectives for the next 12 months are to complete the following stages of its Development Program:

  1. manufacturing – make and supply clinical grade autologous Plexaris product and development of the Exomere manufacturing process;
  2. clinical use – initial small-scale human clinical studies of autologous Plexaris in wound healing;
  3. supporting research and development activities – conducting research activities to support the ongoing Development Program and the development of related intellectual property; and
  4. to also investigate other LEAP Technology Opportunities.


This announcement contains forward-looking statements which incorporate an element of uncertainty or risk, such as ‘intends’, ‘may’, ‘could’, ‘believes’, ‘estimates’, ‘targets’, ‘aims’, ‘plans’ or ‘expects’. These statements are based on an evaluation of current corporate estimates, economic and operating conditions, as well as assumptions regarding future events. These events are, as at the date of this announcement, expected to take place, but there cannot be any guarantee that such events will occur as anticipated or at all given that many of the events are outside of Exopharm’s control or subject to the success of the Development Program. Furthermore, the Company is subject to several risks as disclosed in the Prospectus dated 6 November 2018.

Inherent risks of Investment in Biotechnology Companies

There are a number of inherent risks associated with the development of biopharmaceutical products to a marketable stage. The lengthy clinical trial process is designed to assess the safety and efficacy of a drug prior to commercialisation and a significant proportion of drugs fail one or both of these criteria. Other risks include uncertainty of patent protection and proprietary rights, whether patent applications and issued patents will offer adequate protection to enable product development, the obtaining of necessary drug regulatory authority approvals and difficulties caused by the rapid advancements in technology. Companies such as Exopharm are dependent on the success of their research and development projects and on the ability to attract funding to support these activities. Investment in research and development projects cannot be assessed on the same fundamentals as trading and manufacturing enterprises. Therefore, investment in companies specialising in drug development must be regarded as highly speculative. Exopharm strongly recommends that professional investment advice be sought prior to such investments.

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