QLT announces positive FDA action on Aczone(TM)

    FDA Removes Blood Testing Requirements

    VANCOUVER, March 17 /CNW/ - QLT Inc. (NASDAQ:   QLTI; TSX: QLT) announced
today that the U.S. Food and Drug Administration (FDA) has completed its
review of QLT USA, Inc.'s labeling supplement (sNDA) for Aczone(TM) and has
removed the glucose-6-phosphate dehydrogenase (G6PD) screening and blood
monitoring requirements.
    "We are extremely pleased to report the FDA decision to change the Aczone
label as it validates QLT's clinical, regulatory and commercialization
strategy for this product. Management believed in the product and took the
necessary steps to address the FDA's needs, ultimately dramatically enhancing
the value of Aczone," said Bob Butchofsky, President and Chief Executive
Officer of QLT. "Aczone represents an important clinical advance in the
treatment of acne and demonstrated safety and efficacy in over 4,000 patients.
We can now focus on the divestment of this asset."
    The sNDA submitted at the end of May 2007 was primarily based on the
Phase IV clinical trial completed in 56 safety-evaluable G6PD-deficient
patients (see the related press release issued November 7, 2006). This study
demonstrated no clinical evidence of hemolytic anemia in this patient
    Aczone was originally approved for sale on July 7, 2005. The Phase IV
clinical trial of the product was performed to meet a post-approval commitment
requested by the FDA. The purpose of this study was to gather more information
about the safety of Aczone, a prescription topical medicine, in treating
patients with acne who have G6PD deficiency. During a six-month period,
patients were treated with both Aczone and the Aczone-vehicle (control group)
in a cross-over design. Data was analyzed by third party clinical experts in
dermatology and hematology who concluded that no clinically meaningful changes
in safety-related parameters were observed in the trial.
    Aczone is the only acne treatment to harness the potential of dapsone in
a topical formulation to provide patients with a convenient and effective
therapy. QLT USA owns worldwide marketing rights to Aczone.

    About Aczone(TM)

    ACZONE is an aqueous topical gel containing 5% dapsone. Combining dapsone
in QLT USA's proprietary Solvent Microparticulate (SMP(TM)) gel enables
dapsone to be applied topically and safely. In two randomized double-blind,
vehicle-controlled clinical studies in 3,000 acne patients, ACZONE Gel
achieved statistically significant percent reduction in the number of acne
lesions and better success rate on the Global Acne Assessment Score. The most
common adverse events reported from controlled clinical trials include
oiliness/peeling, dryness, and erythema. There were no significant differences
in the adverse event rates between ACZONE Gel and vehicle control treated
    QLT Inc. is a global biopharmaceutical company dedicated to the
discovery, development and commercialization of innovative therapies. Our
research and development efforts are focused on pharmaceutical products in the
fields of ophthalmology and dermatology. In addition, we utilize three unique
technology platforms, photodynamic therapy, Atrigel(R) and punctal plugs with
drugs, to create products such as Visudyne(R) and Eligard(R) and future
product opportunities. For more information, visit our web site at

    Atrigel is a registered trademark of QLT USA, Inc.
    Visudyne is a registered trademark of Novartis AG.
    Eligard is a registered trademark of Sanofi-aventis.

    QLT Inc. is listed on The NASDAQ Stock Market under the trading symbol
"QLTI" and on The Toronto Stock Exchange under the trading symbol "QLT."

    Certain statements contained in this press release, which are not
historical facts, are "forward-looking statements," as the term is defined in
the Private Securities Litigation Reform Act of 1995 and constitute
"forward-looking information" within the meaning of applicable Canadian
securities laws. You can identify these forward-looking statements by QLT's
use of words such as "expects," "will", "plans," "estimates," "intends,"
"believes" and similar expressions that do not relate to historical matters.
Such forward-looking statements are subject to risks and uncertainties which
can cause actual results to differ materially from those currently anticipated
due to a number of factors, which include, but are not limited to: QLT's
ability, and the time period necessary to complete any divestment of Aczone is
uncertain, and other factors as described in detail in QLT's Annual
Information Form and Annual Report on Form 10-K, quarterly reports on Form
10-Q and other filings with the U.S. Securities and Exchange Commission and
Canadian securities regulatory authorities. Forward-looking statements are
based on the current expectations of QLT and QLT does not assume any
obligation to update such information to reflect later events or developments
except as required by law.

For further information:

For further information: QLT Inc.: Vancouver, Canada, Therese Hayes,
Telephone: (604) 707-7000 or 1-800-663-5486, Fax: (604) 707-7001

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