Dynavax Phase 3 Demonstrates Superiority and Safety of HEPLISAV(TM) vs.
Engerix-B(R)
BERKELEY, CA, Jul 20, 2011 (MARKETWIRE via COMTEX) -- Dynavax Technologies
Corporation (DVAX) today said that top-line data from its Phase 3 trial comparing
HEPLISAV, an investigational hepatitis B virus (HBV) vaccine, to a currently
marketed HBV vaccine, Engerix-B, demonstrated non-inferiority, superiority and
the safety of HEPLISAV. The study evaluated a two-dose regimen of HEPLISAV
administered at 0 and 1 month compared to a three-dose regimen of Engerix-B
administered at 0, 1 and 6 months. The trial studied 2,449 healthy adults 40 to
70 years of age, randomized to HEPLISAV or Engerix-B in a 4:1 ratio. Data
supporting the consistency of three consecutively manufactured lots of HEPLISAV
have been submitted to the Food and Drug Administration (FDA), and Dynavax
expects confirmation of its analysis shortly.
Immunogenicity data demonstrated:
--At the primary endpoint, 8 weeks post the last dose of vaccine, 12
weeks for HEPLISAV and 32 weeks for Engerix-B, the seroprotection rate
(SPR) was 90% for HEPLISAV and 70% for Engerix-B, demonstrating the
non-inferiority and superiority of HEPLISAV to Engerix-B.
--The peak SPR for HEPLISAV occurred at 24 weeks and was 95%. The peak
SPR for Engerix-B occurred at 28 weeks and was 73%.
--At the final visit, week 52, 48 weeks after the last dose of HEPLISAV
and 28 weeks after the last dose of Engerix-B, the SPRs were 92% for
HEPLISAV and 59% for Engerix-B.
Dynavax also reported that the trial's safety data showed HEPLISAV to be safe and
well tolerated, and similar to Engerix-B. Careful safety evaluation over the 12
month duration of trial demonstrated:
--50% of HEPLISAV subjects and 53% of Engerix-B subjects experienced an
adverse event.
--7% of HEPLISAV subjects and 6% of Engerix-B subjects experienced
possibly related adverse events.
--4% of HEPLISAV subjects and 5% of Engerix-B subjects experienced a
serious adverse event.
--3 new onset autoimmune adverse events were confirmed by the Safety
Evaluation and Adjudication Committee (SEAC), none of which were
serious adverse events. All three occurred in the HEPLISAV group,
consistent with the 4:1 randomization.
--There were no cases of ANCA-associated vasculitis or Wegener's
Granulomatosis.
With respect to the consistency analysis of three consecutively manufactured lots
of HEPLISAV, Dynavax concluded that the study had demonstrated consistency based
on the complete immunogenicity data demonstrated by the three vaccine lots over
the six months following second immunization.
--By Geometric Mean Antibody Concentration (GMC), the results met the
pre-specified consistency criteria at 12, 18, 24 and 28 weeks, but not
at 8 weeks, the pre-specified primary endpoint. The GMC of one
HEPLISAV lot was slightly higher than the other two lots, which
resulted in not meeting the consistency criteria at week 8.
--By SPR, the results met the pre-specified consistency criteria at 12,
18, 24 and 28 weeks, but not at 8 weeks.
--At all of these timepoints, each lot of HEPLISAV was superior to
Engerix-B.
Dynavax said it had submitted these data and its analysis supporting lot-to-lot
consistency to the FDA and expects confirmation from the agency in the near
future.
"These results confirm and expand the superiority of HEPLISAV vs. Engerix-B in
this hyporesponsive population of persons age 40 and above. HEPLISAV again
demonstrated the rapid onset of seroprotection and superior peak protection
compared to Engerix-B. A new finding in this trial is the superior duration of
HEPLISAV to Engerix-B. Based on the results of intensive safety monitoring over
12 months, we have again demonstrated that HEPLISAV has a similar safety profile
to Engerix-B, generally considered to be a very safe vaccine. Finally, we believe
the consistency of the peak immune response of three lots of HEPLISAV was clearly
demonstrated in this trial," commented Tyler Martin, M.D., President and Chief
Medical Officer.
Dynavax said it will present complete results from the Phase 3 trial in an oral
presentation at the 51st Interscience Conference on Antimicrobial Agents and
Chemotherapy (ICAAC) on Sunday, September 18, 2011 in Chicago, IL.
Webcast and Conference Call Today
Dynavax will host a conference call and webcast a discussion of the HEPLISAV
Phase 3 top-line data along with the company's second quarter 2011 financial
results on Wednesday, July 20, 2011 at 9:00 a.m. Eastern Daylight Time / 6:00
a.m. Pacific Daylight Time. To join the Conference Call, please dial
1-877-280-7280. International callers can dial 1-707-287-9365. A telephonic
replay of the discussion will be available 90 minutes after its conclusion and
through August 3, 2011 by dialing 1-855-859-2056, access code: 85190076.
International callers can dial 1-404-537-3406, access code: 85190076. The webcast
can be accessed on Dynavax's website at investors.dynavax.com.
A webcast replay of the discussion will be available on Dynavax's website, 90
minutes after its conclusion and through August 3, 2011.
About HEPLISAV
HEPLISAV is an investigational adult hepatitis B vaccine. In an earlier completed
pivotal Phase 3 trial, HEPLISAV demonstrated increased, rapid protection with
fewer doses than current licensed vaccines. Dynavax has worldwide commercial
rights to HEPLISAV and is developing the vaccine for large, high-value
populations that are less responsive to current licensed vaccines, including
individuals with chronic kidney disease. HEPLISAV combines hepatitis B surface
antigen with a proprietary Toll-like Receptor 9 agonist known as ISS to enhance
the immune response.
About Dynavax
Dynavax Technologies Corporation, a clinical-stage biopharmaceutical company,
discovers and develops novel products to prevent and treat infectious and
inflammatory diseases. The Company's lead product candidate is HEPLISAV, a Phase
3 investigational adult hepatitis B vaccine designed to provide rapid and
superior protection with fewer doses than current licensed vaccines. For more
information visit dynavax.com. |
