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Medicago and GSK Announce Positive Interim Phase 2 Results for Adjuvanted COVID-19 Vaccine Candidate

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Medicago, a biopharmaceutical company headquartered in Quebec City, and GlaxoSmithKline (GSK) are pleased to report positive interim Phase 2 clinical trial safety and immunogenicity data for Medicago’s plant-derived COVID-19 vaccine candidate, which has been tested in combination with GSK’s pandemic adjuvant. These results are part of the ongoing Phase 2/3 study and reiterate the promising profile observed during Phase 1 testing. Immunogenicity, as measured by the neutralizing antibody titer, was high - about 10 times higher than those in a panel of sera from patients recovering from COVID-19. No related severe adverse events were reported and reactogenicity was generally mild to moderate and short in duration.

“We are very excited to see such positive results from the Phase 2 data. After two doses, the adjuvanted vaccine candidate induced robust neutralizing antibody and cellular immune responses in all subjects, irrespectively of age,” said Nathalie Landry, Executive Vice President, Scientific and Medical Affairs at Medicago. “These results give us confidence as we continue to move forward with our Phase 3 clinical trial. We hope to add another tool in the global fight against COVID-19, particularly as cross-protection emerges as an important consideration in vaccination efforts worldwide.”

Thomas Breuer, Chief Medical Officer, GSK Vaccines said, “We are delighted to see that the results suggest a very strong immune response. Medicago’s COVID-19 vaccine candidate, combined with GSK’s pandemic adjuvant, was also well tolerated, reinforcing its potential benefits. We now look forward to the outcome of the ongoing Phase 3 trial of the refrigerator-stable vaccine candidate as the next step forward in our contribution to the global response to the pandemic.”

The Phase 3 trial of the vaccine candidate launched on March 16, 2021. Trial sites are currently enrolling subjects in Canada, the United States, the United Kingdom, and Brazil, with additional sites expected to be added in the coming weeks. The vaccine candidate has received Fast Track designation by the FDA in the United States, and Health Canada has initiated a review of Medicago’s COVID-19 rolling submission under the Interim Order.

About Phase 2: Results Summary

The interim data from the Phase 2 trial in adults and in the elderly have been published on an online preprint server at MedRxiv.

  • This publication focuses on presenting safety and tolerability results, and immunogenicity, as measured by neutralizing antibody (NAb) and cell mediated immunity (IFN-γ and IL-4 ELISpot) responses, in Adults aged 18-64 (Adults) and Older Adults aged 65+ (Older Adults).
  • Medicago’s vaccine candidate with GSK’s pandemic adjuvant exhibited an acceptable safety profile and adverse events (AE) were primarily mild or moderate and of transient duration.
  • AEs in Older Adults were more limited than those observed in the Adult population.
  • Medicago’s vaccine candidate with GSK’s pandemic adjuvant induced a significant humoral immune response of similar strength in both age cohorts after two doses.
  • The vaccine candidate induced a greater humoral response in Adults than Older Adults after a single dose but after the second dose both age cohorts responded with NAb titers that were about 10 times higher than those in a panel of sera from patients recovering from COVID-19.

About the Phase 2/3 study

The Phase 2/3 study is a multi-portion design to confirm that the chosen formulation and dosing regimen of CoVLP (two doses of 3.75 µg CoVLP combined with GSK's pandemic adjuvant given 21 days apart) has an acceptable immunogenicity and safety profile in healthy adults 18-64 years of age, elderly subjects aged 65 and over and adults with comorbidities.

The Phase 2 portion of the trial was a randomized, observer-blind, placebo-controlled study to evaluate the safety and immunogenicity of the adjuvanted recombinant COVID-19 plant-derived vaccine candidate in subjects aged 18 and above. It was conducted in multiples sites in Canada and the United States on a population composed of healthy adults (18-64y), elderly adults (over 65y) and adults with comorbidities. Each age group enrolled up to 306 subjects randomized 5:1 to receive the adjuvanted CoVLP vaccine candidate: placebo and with 2:1 stratification in older adults (65-74 and ≥75). All subjects will be followed for a period of 12 months after the last vaccination for the assessment of safety and durability of the immune responses to the vaccine candidate which will be the final analysis.

The Phase 3 portion is an event-driven, randomized, observer-blinded, crossover placebo-controlled design that will evaluate the efficacy and safety of the CoVLP formulation, compared to placebo, in up to 30,000 subjects in North America, Latin America and Europe and within the same population.

About Medicago

Medicago is on a mission to improve global public health using the power of plants. Founded in 1999 with the belief that innovative approaches and rigorous research would bring new solutions in healthcare, Medicago is a pioneer in plant-derived therapeutics. We are proudly rooted in Quebec, with manufacturing capacity in both Canada and the US. Our passionate and curious team of over 500 scientific experts and employees are dedicated to using our technology to provide rapid responses to emerging global health challenges, and to advancing therapeutics against life-threatening diseases worldwide.

For more information: www.medicago.com

About GSK and its commitment to tackling COVID-19

GSK is a science-led global healthcare company with a special purpose: to help people do more, feel better, live longer. For further information please visit www.gsk.com/about-us.

GSK is collaborating with companies and research groups across the world working on promising COVID-19 vaccine candidates through the use of our innovative vaccine adjuvant technology. The use of an adjuvant is of particular importance in a pandemic situation since it may reduce the amount of vaccine protein required per dose, allowing more vaccine doses to be produced and therefore contributing to protecting more people. GSK does not expect to profit from COVID-19 vaccines during the pandemic phase and will invest any short-term profit in coronavirus related research and long-term pandemic preparedness, either through GSK internal investments or with external partners.

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Contact information

Medicago media contact (English):
Alissa Von Bargen (North America)
+1 647 234 5975 (Toronto)
medicago.media@gcicanada.com

Gabby Koumis (UK/Global)
+44 (0) 78 3328 6784 (London)
gabby.koumis@gcihealth.com

GSK enquiries:
Media enquiries:
Simon Steel +44 (0) 20 8047 5502 (London)
Simon Moore +44 (0) 20 8047 5502 (London)
Kathleen Quinn +1 202 603 5003 (Washington DC)

Analyst/Investor enquiries:
Sarah Elton-Farr +44 (0) 20 8047 5194 (London)
James Dodwell +44 (0) 20 8047 2406 (London)
Jeff McLaughlin +1 215 751 7002 (Philadelphia)

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