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Quest PharmaTech Announces Positive Results from Phase I Clinical Trial of its Photodynamic Therapy for Actinic Keratosis

TSX Venture: QPT

EDMONTON, June 2 /PRNewswire-FirstCall/ - Quest PharmaTech Inc. (TSX-V: QPT), ("Quest" or the "Company"), today announced that its 12-patient, Phase I clinical study entitled "ACP-SL017 Topical Gel: A Phase I Study for the Photodynamic Therapy of Actinic Keratosis" has met both its primary and exploratory objectives.

"We are delighted to have received, for the first time, clinical validation for our SonoLight Technology in a dermatological application," said Madi R. Madiyalakan, CEO of Quest. "Actinic Keratosis is a pre-cancerous skin condition usually caused by prolonged accumulated sun exposure which can progress to squamous cell carcinoma, a potentially life-threatening form of skin cancer, unless treated by a dermatologist or other physician. This trial successfully demonstrated that cutaneous photodynamic therapy (PDT) with SL017 appears safe and is well tolerated. In addition, our unique approach is designed to overcome some of the limitations associated with other commercially available PDT treatments for Actinic Keratosis."

Actinic Keratosis has a global incidence of approximately 10 to 15% in the Caucasian population and the American Medical Association estimates the U.S. market for the treatment of Actinic Keratosis to be about US $250 million.

The primary objective of the Phase I study, which was conducted in Canada, was to determine the cutaneous and systemic toxicity of the topically-applied photoactive drug, SL017, with and without photoactivation. The exploratory objective was to evaluate the efficacy of SL017 with and without photoactivation in the treatment of Actinic Keratosis. The study parameters employed included physician clinical assessment, patient symptomatic assessment, skin photography, blood chemistry, urinalysis, electrocardiogram and skin biopsy. The study was conducted at clinical sites in Edmonton and Montreal.

The study met all the objectives addressing the clinical safety endpoints. There were no observed clinically relevant adverse events associated with the treatment at all the concentrations (0 to 40 mg of SL017) and light doses (10 to 20 joules/cm(2)) administered. The light treatment, conveniently administered in a dermatology clinic, was well tolerated. The therapeutic potential of SL017 was evidenced by the expected (PDT) effects, such as redness, edema, occasional blisters, stinging and burning. The clinical correlates of dyskeratosis and inflammation were likewise appropriately noted on skin biopsy. Clinical and pathological results correlated very well, and conformed not only to the expected effects of PDT but also to the dosage of the drug and light energy administered. The study suggests that a 2% topical formulation of SL017 and a fluence of 20 joules/cm (2) provide expected PDT outcomes. Importantly, this Phase I study did not identify any safety concerns with respect to the parameters evaluated at the dosages of drug and light employed.

"I am encouraged by the confirmation of the topical PDT effects of SL017 and its potential for future applications in a variety of dermatological conditions including Actinic Keratosis," commented Dr. Gilles Lauzon, former Director, Division of Dermatology, University of Alberta and one of the investigators of the study.

The potential applications of cutaneous PDT also include acne, rosacea, superficial skin cancers, cutaneous T-cell lymphoma, localized scleroderma, warts, leishmaniasis and skin rejuvenation. Quest has already shown the follicular uptake of SL017 in humans; and is currently conducting a 90-patient trial addressing potential hair removal applications with results anticipated by end of this year. The Company is also evaluating the utility of SL017 for the treatment of acne in a preclinical model.

Paramount Biosciences, a global pharmaceutical and healthcare investment firm, has exclusive rights to develop and commercialize SL017 for dermatology-related applications outside Canada. Paramount Biosciences is conducting Investigational New Drug-enabling pre-clinical studies to initiate a clinical trial for dermatology applications that will meet U.S. Food and Drug Administration requirements for one or more indications. Quest will coordinate with Paramount Biosciences for the further development of SL017.

Quest is also pleased to announce that it has retained The Equicom Group Inc. (Equicom) to provide the Company with strategic investor relations and corporate communications services. Under the terms of the agreement, Quest will pay Equicom a monthly retainer fee of $5,000 for professional services. The initial contract term is 12 months. Neither Equicom nor any of its principals has an ownership interest, directly or indirectly, in Quest or its securities, and Quest has not granted Equicom or its principals any right to acquire such an interest. Equicom is a wholly-owned subsidiary of TSX Group Inc. Equicom provides strategic communications services to more than 100 public companies across a diverse range of industries. For further information about Equicom, please visit

About Quest PharmaTech Inc.

Quest PharmaTech is a publicly traded (TSX Venture Exchange: QPT), Alberta-based pharmaceutical company committed to the development and commercialization of new pharmaceutical products. It is developing a series of products for the treatment of cancer and dermatological conditions based on its unique SonoLight photodynamic and sonodynamic therapy platform.

TSX Venture Exchange has neither approved nor disapproved of the

information contained herein.

SOURCE Quest PharmaTech Inc.
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