Circassia Limited Announces Successful Results From Phase II Clinical Study of ToleroMune(R) Cat Allergy Therapy Study Identifies Optimal Treatment Approach for Late-Stage Development

OXFORD, England, November 20 /PRNewswire/ -- Circassia Ltd, a specialty biopharmaceutical company focused on allergy, today announced positive results from a recently completed phase II clinical study of its ToleroMune(R) cat allergy therapy, which successfully identified the optimal dosing regimens to progress into late-stage development. The clinical trial, which was the first of its kind in the field of cat allergy immunotherapy, showed that Circassia's ToleroMune treatment was extremely well tolerated and greatly reduced sufferers' symptoms.

Circassia conducted the double-blind study in Canada, where 121 subjects with confirmed cat allergies were randomised to receive placebo or one of four different treatment regimes with standardised doses of ToleroMune. The volunteers were exposed to cat allergens (aerosolised dander) in an environmental exposure chamber for 3 hours each day on four consecutive days, both before and after treatment. At set time points the subjects scored their ocular and nasal symptoms to allow investigators to measure the effect of the ToleroMune treatment. This is the first trial of a cat allergy immunotherapy to use this validated approach.

The study's results demonstrate that ToleroMune therapy can dramatically reduce both nasal and ocular allergy symptom levels, and that the treatment effect grows as the duration of exposure increases and symptoms are at their greatest. The optimal regimen decreased total symptom scores by 67% compared with placebo. Throughout the study ToleroMune treatment was extremely well tolerated, with a safety profile similar to placebo. This contrasts with many traditional immunotherapies, which are associated with a range of local tolerability issues and sometimes severe and even life-threatening adverse events.

"These positive phase II results are extremely important for Circassia as they identify the optimal treatment regime to move into the final stages of development for our cat allergy therapy, and will prove invaluable as we progress our broader portfolio of ToleroMune products," said Steve Harris, Circassia's CEO. "We are particularly pleased that the ToleroMune treatment achieved such a marked improvement in ocular symptoms, which can be a particular problem in cat allergy. As well as benefiting patients, this effect scientifically validates the ToleroMune approach and its novel focus on generating regulatory T cells to shut down this type of IgE-mediated allergic response."

About Circassia

Circassia is a specialty biopharmaceutical company focused on the field of allergy. The company's range of allergy therapeutics utilises its proprietary T-cell epitope desensitisation technology, ToleroMune, in a short treatment regime without the need for adjuvants or other immune stimulators. Circassia's products offer potential major clinical benefits compared with existing therapies, and consequently have significant market opportunities. Over 150 million people suffer from allergic rhinitis in the US and Europe, and the current treatment market is approximately $12 billion per year.

ToleroMune technology has additional potential regulatory and supply chain benefits. The short peptides utilised in Circassia's products are manufactured chemically, in contrast to existing allergen immunotherapies, which are purified from natural sources. Circassia's approach applies the chemistry, manufacturing and control standards associated with conventional pharmaceuticals to immunotherapy. This fits with changes in the European regulatory environment, where authorities are increasingly treating allergen immunotherapies as pharmaceutical products, and requiring elimination of the batch-to-batch potency variability that is an intrinsic feature of many currrent treatments.

Circassia has a highly experienced management team with a proven track record in product development and commercialisation. Having successfully completed two fundraising rounds the company is backed by a syndicate of world-class venture capital and institutional investors, including Imperial Innovations, Lansdowne Partners, Goldman Sachs and Invesco Perpetual.

CONTACT: Contacts: Steve Harris, CEO, Circassia, Tel: +44-(0)1865-784574.
Rob Budge, RJB Communications, Tel: +44-(0)1865-760969, Mobile:
+44-(0)7710-741241