Allergy Thera. Regulatory News (AGY)

Allergy Therapeutics plc

("Allergy Therapeutics" or the "Group")

Allergy Therapeutics announces publication of data demonstrating long-lasting efficacy of Pollinex Quattro Grass vaccine in Immunotherapy

25 June 2018 Allergy Therapeutics plc (AIM: AGY), the fully integrated commercial biotechnology company specialising in allergy vaccines, today announces the publication of positive data in the journal Immunotherapy, demonstrating long-lasting efficacy of Pollinex Quattro Grass in patients with grass pollen allergy. Zielen et al., Long-term effect of monophosphoryl lipid A adjuvanted specific immunotherapy in patients with grass pollen allergy. doi; 10.2217/imt-2018-0004 (ePub ahead of print).

The observational study, led by Professor Stefan Zielen of the Goethe University, Germany, focused on the long-term efficacy of Pollinex Quattro Grass. Each of the clinical symptoms (runny nose, sneezing and conjunctivitis) were statistically significantly reduced in treated patients compared with controls without allergen-specific immunotherapy. The study concluded that patients treated with Pollinex Quattro Grass vaccine exhibited significant and long-lasting symptom improvements 3-6 years after cessation of treatment.

Professor Stefan Zielen, author of the paper commented; "We are delighted with the publication of our observational study that demonstrates the long-term effects of Pollinex Quattro Grass immunotherapy. Our paper highlights the benefits that this allergen-specific immunotherapy can offer allergy sufferers, in terms of patient convenience, as well as the potential for positive and long-lasting effects."

Manuel Llobet, CEO at Allergy Therapeutics, said: "This paper validates earlier studies indicating Pollinex Quattro is disease modifying for the many patients affected by grass allergy. Together with the recently announced positive data from our Phase Grass G205 clinical study, we believe that we have a robust data set for our suite of novel allergy product candidates. We look forward to commencing further studies with the goal of developing a strong allergy portfolio to patients globally, including in the significant US market."

The data presented supports earlier studies investigating Pollinex Quattro, Zielen et al., 20071 and Rabe et al 20172. Sustained efficacy according to European Medicine Agency criteria in 3114 patients was shown in the 2007 Zielen paper1, where after 3 years, improvement of symptoms was reported in more than 93% of patients and the consumption of anti-allergic medication decreased in more than 75% of patients.

- ENDS -

For further information, please contact:

Allergy Therapeutics

+44 (0) 1903 845 820

Manuel Llobet, Chief Executive Officer

Nick Wykeman, Chief Financial Officer

Panmure Gordon

+44 (0) 20 7886 2500

Freddy Crossley, Emma Earl, Corporate Finance

Consilium Strategic Communications

+44 20 3709 5700

Mary-Jane Elliott / Ivar Milligan / David Daley

allergytherapeutics@consilium-comms.com

Stern Investor Relations, Inc.

+1 212 362 1200

Christina Tartaglia

christina@sternir.com

Notes for editors:

About Allergy Therapeutics

Allergy Therapeutics is an international commercial biotechnology company focussed on the treatment and diagnosis of allergic disorders, including immunotherapy vaccines that have the potential to cure disease. The Group sells proprietary and third party products from its subsidiaries in nine major European countries and via distribution agreements in an additional ten countries. Its broad pipeline of products in clinical development include vaccines for grass, tree and house dust mite, and peanut allergy vaccine in pre-clinical development. Adjuvant systems to boost performance of vaccines outside allergy are also in development.

Formed in 1999 out of Smith Kline Beecham, Allergy Therapeutics is headquartered in Worthing, UK with more than 11,000m2 of state-of-the-art MHRA-approved manufacturing facilities and laboratories. The Group, which has achieved double digit compound annual growth since formation, employs c.500 employees and is listed on the London Stock Exchange (AIM:AGY). For more information, please see www.allergytherapeutics.com.

About Pollinex Quattro Grass

Pollinex Quattro Grass contains three distinct components: allergoids, micro-crystalline tyrosine (MCT) and monophosphoryl lipid A (MPL®). Allergoids (natural allergens chemically modified to form allergoids) exhibit reduced allergenicity that improves safety and allows for delivery of higher doses. These are combined with the depot adjuvant technology MCT to provide enhanced immune exposure and further improved tolerability.

Finally, the immune response is enhanced and directed by the adjuvant MPL®. MPL is a toll-like 4 receptor (TLR4) agonist which is extensively used in the Group's allergy vaccine portfolio and in infectious disease vaccines registered in the USA.

About US allergy market

The US allergy immunotherapy market, which is anticipated to be the main market for this product, is estimated by the Group to be worth $2 billion with potential peak grass vaccine sales of $300-400 million per annum.

1- Zielan et al., Aller gologie, Jahrgang 30, Suppl. 1/2007, S1-S8.

2- Rabe, U et al. Allergo J Int (2017) 26: 147.