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SEBIVO(R) Demonstrated Better Antiviral Activity Compared to Adefovir in Patients With Chronic Hepatitis B; New Data Pre


-- Professor Thierry Poynard, Hopital Pitie-Salpetriere, University of
Paris VI, France, presented findings from a study that examined the
post-treatment response in HBeAg-positive patients from the GLOBE
study who were treated with telbivudine and lamivudine. After one
year, HBeAg-positive patients were eligible to discontinue treatment
for efficacy provided they had exhibited HBeAg loss and maintained HBV
DNA <5 log(10) copies/mL for at least six months; 39 out of the 134
eligible patients discontinued telbivudine treatment for efficacy. A
preliminary analysis of these patients showed that 80 percent or more
of the 39 patients who discontinued telbivudine treatment for efficacy
exhibited sustained HBeAg responses, demonstrating durability of
response when patients have come off treatment due to successful
treatment with telbivudine.(5)
-- Professor Jens Rasenack, Albert Ludwigs University, Freiburg, Germany
presented a preliminary analysis of the two-year GLOBE data, which
showed that telbivudine provided better treatment outcomes in those
patients who are eligible for treatment according to international
liver association treatment guidelines such as the Asian Pacific
Association for the Study of Liver (APASL) and American Association
for the Study of Liver Diseases (AASLD) guidelines. Those guidelines
recommend patients with elevated levels of HBV DNA and liver enzyme
levels (called ALT) that are two times higher than normal undergo
antiviral treatment to reduce viral levels in their bodies. In these
patients (n=588), telbivudine provided significantly greater HBeAg
seroconversion than lamivudine at two years (36 percent vs. 27
percent, respectively) as well as significantly better antiviral
efficacy (61 percent vs. 43 percent achieved undetectable virus
levels, respectively) and ALT normalization (72 percent vs. 63
percent, respectively) than lamivudine.(6)
-- Dr. Rifaat Safadi, Holy Family Hospital, Nazareth, Israel, presented
study findings that show that switching patients with inadequate
response to lamivudine (residual HBV DNA >3 log) to telbivudine
provided significantly improved viral suppression. Patients switched
from lamivudine to telbivudine at six months(n=122) experienced an
additional reduction of 1.90 log10 copies/mL compared to 0.90 log(10)
copies/mL for patients who continued lamivudine (n=124).(7)
-- Dr. Jia JiDong, Beijing Friendship Hospital, Beijing, discussed
findings from a study of 332 Chinese hepatitis B patients showing that
after two years of therapy, telbivudine achieved more profound,
sustained viral suppression than lamivudine (HBV DNA reduction of 5.48
vs. 4.00 mean log(10) copies/mL, respectively). In addition, more
patients treated with telbivudine achieved HBeAg seroconversion and
HBeAg loss at two years compared to patients taking lamivudine, (29
percent (40/138) vs. 20 percent (28/138) and 40 percent (55/138) vs.
28 percent (39/138), respectively).(8)

In clinical studies telbivudine was generally well tolerated with most adverse experiences classified as mild or moderate in severity. Common (>1/100, <1/10) adverse reactions in telbivudine-treated patients reported by one year in the GLOBE study were dizziness, headache, cough, diarrhea, nausea, abdominal pain, skin rash, fatigue and blood testing showing higher levels of liver enzymes, amylase, lipase or creatine kinase. Uncommon (>1/1,000, <1/100) adverse reactions included joint pain, persistent muscle weakness or muscle pain and malaise.

About Idenix/Novartis collaboration

Idenix and Novartis Pharma AG are co-promoting SEBIVO (telbivudine), for the treatment of hepatitis B, and co-developing valtorcitabine, a second hepatitis B compound, and valopicitabine, a hepatitis C compound, under a development and commercialization arrangement established in May 2003. Under this agreement, Novartis and Idenix will co-promote SEBIVO/TYZEKA, valtorcitabine and valopicitabine in the US, France, Germany, Italy, Spain and the UK. Novartis has the exclusive right to commercialize SEBIVO, valtorcitabine and valopicitabine in the rest of the world.

About Idenix

Idenix Pharmaceuticals, Inc., headquartered in Cambridge, MA, is a biopharmaceutical company engaged in the discovery and development of drugs for the treatment of human viral and other infectious diseases. Idenix's current focus is on the treatment of infections caused by hepatitis B virus, hepatitis C virus and human immunodeficiency virus (HIV). For further information about Idenix, please refer to http://www.idenix.com.

Forward-looking statements

This press release contains "forward-looking statements" within the meaning of The Private Securities Litigation Reform Act of 1995. Such forward-looking statements can be identified by the use of forward-looking terminology such as "potential," "committed," "anticipate," "expected," "will," or similar expressions, or by express or implied statements with respect to potential approvals of SEBIVO or other development product candidates by the European Commission or in additional markets, or potential future revenues from SEBIVO or other development product candidates. Such forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance or achievements expressed or implied by such statements. There can be no guarantees that SEBIVO or other development product candidates will be approved for sale by the European Commission or in any other markets, or that SEBIVO will achieve any particular levels of sales, or that our development product candidates will ever achieve any sales. In particular, management's expectations could be affected by unexpectedly unsuccessful efforts to commercialize SEBIVO; unexpected regulatory actions or delays; uncertainties relating to results of clinical trials, including additional data relating to the ongoing clinical trials evaluating its product candidates; the company's ability to obtain additional funding required to conduct its research, development and commercialization activities; the company's dependence on its collaboration with Novartis Pharma AG; the ability of the company to attract and retain qualified personnel; competition in general; and the company's ability to obtain, maintain and enforce patent and other intellectual property protection for its other product candidates and its discoveries. These and other risks which may impact management's expectations are described in greater detail under the caption "Risk Factors" in the company's annual report on Form 10-K for the year ended December 31, 2006 and filed with the Securities and Exchange Commission and other filings that the company makes with the Securities and Exchange Commission.

All forward-looking statements reflect the company's expectations only as of the date of this release and should not be relied upon as reflecting the company's views, expectations or beliefs at any date subsequent to the date of this release. Idenix anticipates that subsequent events and developments may cause these views, expectations and beliefs to change. However, while Idenix may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so.

[TAB]

References:

1. Marcellin P et al. 76 week follow-up of HBeAG-positive chronic

hepatitis B patients treated with telbivudine, adefovir or switched

from adefovir to telbivudine. Study abstract. EASL 2007.

2. Marcellin P et al. In hepatitis B patients treated with either

adefovir or telbivudine, maximal early HBV suppression at 24 weeks

predicts optimal one-year efficacy. Study abstract. EASL 2007

3. Van Damme P, et al. Hepatitis B prevention in Europe: a preliminary

economic evaluation. Vaccine, Vol. 13, Supplement 1, pp. S54-S57, 1995

International Journal of Epidemiology; V.32; 2003; p118

4. World Health Organization. Hepatitis B fact sheet number 204.

Available at http://www.who.int/mediacentre/factsheets/fs204/en/

Accessed 2/5/07

5. Poynard T. et al. Sustained off-treatment HBeAG response in

telbivudine and lamivudine treated HBeAG-positive patients from the

GLOBE study. Study abstract. EASL 2007.

6. Rasenack J. et al. Efficacy of telbivudine vs lamivudine at 2 years in

patients with HBeAG-positive chronic hepatitis B who are eligible for

treatment on guidelines. Study abstracts. EASL 2007.

7. Safadi R. et al. A randomized trial of switching to telbivudine versus

continued lamivudine in adults with chronic hepatitis B: results of

the primary analysis at week 24. Study abstracts. EASL 2007.

8. Jia JD. et al. Two-year results of a phase III comparative trial of

telbivudine vs lamivudine in Chinese patients. Study abstract. EASL

2007.

Idenix Pharmaceuticals' Contacts:

Media: Teri Dahlman +1-617-995-9905

Investors: Amy Sullivan +1-617-995-9838

[FTAB]

Web site: http://www.idenix.com

Teri Dahlman, +1-617-995-9905; or Amy Sullivan, +1-617-995-9838, both of Idenix Pharmaceuticals


References:
1. Marcellin P et al. 76 week follow-up of HBeAG-positive chronic
hepatitis B patients treated with telbivudine, adefovir or switched
from adefovir to telbivudine. Study abstract. EASL 2007.
2. Marcellin P et al. In hepatitis B patients treated with either
adefovir or telbivudine, maximal early HBV suppression at 24 weeks
predicts optimal one-year efficacy. Study abstract. EASL 2007
3. Van Damme P, et al. Hepatitis B prevention in Europe: a preliminary
economic evaluation. Vaccine, Vol. 13, Supplement 1, pp. S54-S57, 1995
International Journal of Epidemiology; V.32; 2003; p118
4. World Health Organization. Hepatitis B fact sheet number 204.
Available at http://www.who.int/mediacentre/factsheets/fs204/en/
Accessed 2/5/07
5. Poynard T. et al. Sustained off-treatment HBeAG response in
telbivudine and lamivudine treated HBeAG-positive patients from the
GLOBE study. Study abstract. EASL 2007.
6. Rasenack J. et al. Efficacy of telbivudine vs lamivudine at 2 years in
patients with HBeAG-positive chronic hepatitis B who are eligible for
treatment on guidelines. Study abstracts. EASL 2007.
7. Safadi R. et al. A randomized trial of switching to telbivudine versus
continued lamivudine in adults with chronic hepatitis B: results of
the primary analysis at week 24. Study abstracts. EASL 2007.
8. Jia JD. et al. Two-year results of a phase III comparative trial of
telbivudine vs lamivudine in Chinese patients. Study abstract. EASL
2007.

Idenix Pharmaceuticals' Contacts:
Media: Teri Dahlman +1-617-995-9905
Investors: Amy Sullivan +1-617-995-9838

Web site: http://www.idenix.com

Teri Dahlman, +1-617-995-9905; or Amy Sullivan, +1-617-995-9838, both of Idenix Pharmaceuticals