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Ninety-Six Week Data on Tibotec Investigational NNRTI, TMC278, Presented at AIDS 2008

- Phase IIb study examines efficacy and safety of once-daily TMC278 in

treatment-naive adults with HIV-1 -

MEXICO CITY, Aug. 5 /PRNewswire/ -- New phase IIb data from Tibotec Pharmaceuticals Ltd. provides additional information on the safety and efficacy of TMC278, the company's once-daily, investigational non-nucleoside reverse transcriptase inhibitor (NNRTI), as part of HIV combination therapy in treatment-naive adults. These findings were presented today at the International AIDS Conference (AIDS 2008) in Mexico City.

Seventy-six percent of patients receiving the 25 mg dose of TMC278, which is being studied in phase III trials, achieved an undetectable viral load (<50 HIV-1 RNA copies/mL) at week 96 compared with 71 percent of patients receiving efavirenz (EFV). Of patients receiving the 75 mg and 150 mg doses of TMC278, 72 percent and 71 percent achieved an undetectable viral load, respectively.

"NNRTIs have been an integral part of combination antiretroviral therapy for over a decade," said clinical trial investigator Peter Shalit, M.D. Swedish Medical Center, Seattle, WA. "The phase IIb data show potential for TMC278 as a once-daily treatment option for patients who have not previously taken anti-HIV medications."

TMC278 is an investigational product, and the safety and efficacy of it, in combination with other antiretroviral agents, has not been established. Two major phase III trials for TMC278 are being conducted in Africa, Asia, Europe, North America and South America, and are currently recruiting treatment-naive adult patients.

Study Design

The phase IIb dose-finding study (TMC278-C204) evaluated the efficacy, tolerability and safety of once-daily TMC278 at three blinded doses (25 mg, 75 mg, and 150 mg) and included an open label EFV 600 mg arm. A total of 368 patients were randomised to receive one of the three doses of TMC278 or EFV, and all patients received a background regimen of two nucleoside reverse transcriptase inhibitors (NRTIs), zidovudine + lamivudine (AZT/3TC) or tenofovir + emtricitabine (TDF/FTC).

Safety Results

Of patients in the TMC278 combined group compared with EFV, 9 percent vs. 21 percent experienced rash, 31 percent vs. 48 percent experienced nervous system adverse events and 16 percent vs. 21 percent experienced psychiatric events.

Overall, patients in the TMC278 combined group (all doses) vs. the EFV group experienced similar incidences and types of serious adverse events (SAEs) (12 percent vs. 15 percent), grade 3 or 4 adverse events (AEs), (27 percent vs. 21 percent) and grade 3 or 4 laboratory abnormalities (26 percent vs. 24 percent).

TMC278 is the third anti-HIV compound to be developed by Tibotec Pharmaceuticals, which is also developing investigational compounds for the treatment of hepatitis C and tuberculosis.

About Tibotec Pharmaceuticals Ltd.

Tibotec Pharmaceuticals Ltd., based in Cork, Ireland, is a pharmaceutical research and development company. The Company's main research and development facilities are in Mechelen, Belgium with offices in Yardley, PA. Tibotec is dedicated to the discovery and development of innovative HIV/AIDS drugs and anti-infectives for diseases of high unmet medical need.

Media Contacts:

Karen Manson - 32-479-89-47-99

Pam Van Houten - 908-295-7367

Investor Relations Contacts:

Lesley Fishman - 732-542-3922

Louise Mehrota - 732-524-6491

SOURCE Tibotec Pharmaceuticals Ltd.
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