Participants Demonstrating Neutralizing Activity that Blocks Infection
ATLANTA, Oct. 3, 2011 - GeoVax Labs, Inc. (OTCQB/OTCBB: GOVX), an
Atlanta-based biopharmaceutical firm developing vaccines to prevent and fight Human Immunodeficiency Virus (HIV) infections, announced
today the completion of enrollment for a Phase 2a clinical trial testing its HIV/AIDS vaccine. The vaccine is being developed for use
in uninfected people to prevent infection should they be exposed to the virus. The trial, designated HVTN 205, is being conducted
by the HIV Vaccines Trials Network (HVTN), which is funded by the National Institute of Allergy and Infectious Diseases, part
of the National Institutes of Health. A total of 299 participants are enrolled in HVTN 205.
GeoVax also announced the unblinding of data for neutralizing antibody (Ab) responses in part 1 of HVTN 205 - showing
elicitation of unexpectedly high response rates of neutralizing antibody for tier 2 isolates of HIV-1. Of 46 tested vaccine recipients, 50%
responded with neutralizing activity for tier 2 clade B isolate RHPA; and 26% with neutralizing antibody for tier 2 clade B isolate
SC22.3C2. Neutralizing antibodies can block virus from infecting cells by binding to regions of the virus that mediate entry into
cells. The elicitation of neutralizing antibody for tier 2 viruses is an important result because tier 2 viruses represent
viruses that undergo the most frequent transmission from an infected person to an uninfected person. A new highly
sensitive test was used for conducting neutralization tests, which were done at the HVTN laboratories at Duke University.
"Elicitation of neutralizing antibody is a much sought goal for an HIV/AIDS vaccine," said Harriet Robinson, Ph.D.,
Chief Scientific Officer of GeoVax. "The field has been trying to achieve this goal by re-engineering the HIV envelope protein that
mediates entry into cells. Our vaccines use natural forms of the HIV envelope to raise antibody. We are extremely pleased that our
natural form of the HIV envelope protein can elicit neutralizing Ab for tier 2 viruses."
"The completion of enrollment for our phase 2a trial is an important milestone," said Robert McNally, Ph.D.,
GeoVax's President and CEO. "We now look forward to completion of the inoculations and the unblinding of safety and immunogenicity
results for the entire trial."
Patient enrollment for HVTN 205 was conducted at 11 clinical sites in North America and two sites in South America.
About GeoVax Labs, Inc.
GeoVax is a biotechnology company developing human vaccines for diseases caused by HIV (Human Immunodeficiency Virus - that leads to AIDS) and
other infectious agents. Our goals include developing HIV/AIDS vaccines for global markets, overseeing the manufacture and testing of these
vaccines under GMP/GLP conditions (FDA guidelines), conducting clinical trials for vaccine safety and effectiveness, and obtaining
regulatory approvals to move the product forward. GeoVax's vaccines are unique in expressing virus like particles that display
the trimeric membrane bound form of the HIV-1 envelope glycoprotein. All preventative Phase 1 human clinical trials conducted
to date tested various combinations and doses of our DNA and MVA vaccines, their ability to raise anti-HIV humoral
(antibody) and cellular (cytotoxic T cell) immune responses, as well as, the vaccines' safety. Successful results
from Phase 1 testing supported the initiation of Phase 2 testing and the extension of clinical testing to
include a granulocyte macrophage-colony stimulating factor (GM-CSF) adjuvanted version of the vaccine.
GeoVax is also enrolling patients in a Phase 1 therapeutic trial for individuals already infected
with HIV. For more information, please visit www.geovax.com.
About the HVTN
The HIV Vaccine Trials Network (HVTN) is the largest worldwide clinical trials network dedicated to the development and testing
of HIV/AIDS vaccines. The HVTN is an international collaboration that conducts all phases of clinical trials, from evaluating experimental
vaccines for safety and the ability to stimulate immune responses, to testing vaccine efficacy. Support for the HVTN comes from the
National Institute of Allergy and Infectious Diseases (NIAID), part of the U.S. National Institutes of Health (NIH). The Network's
HIV Vaccine Trial Units are located at leading research institutions in 27 cities on four continents. The Network's headquarters
are at the Fred Hutchinson Cancer Research Center in Seattle, Washington. www.hvtn.org/
Certain statements in this document are "forward-looking statements" within the meaning of the Private
Securities Litigation Reform Act. These statements are based on management's current expectations and are
subject to uncertainty and changes in circumstances. Actual results may differ materially from those included in
these statements due to a variety of factors, including whether: GeoVax can develop and manufacture these
vaccines with the desired characteristics in a timely manner, GeoVax's vaccines will be safe for human use,
GeoVax's vaccines will effectively prevent AIDS in humans, vaccines will receive regulatory approvals necessary
to be licensed and marketed, GeoVax raises required capital to complete vaccine development, there is
development of competitive products that may be more effective or easier to use than GeoVax's products, GeoVax
will be able to enter into favorable manufacturing and distribution agreements, and other factors, over which
GeoVax has no control. GeoVax assumes no obligation to update these forward-looking statements, and does not
intend to do so. More information about these factors is contained in GeoVax's filings with the Securities and
Exchange Commission including those set forth at "Risk Factors" in GeoVax's Form 10-K.
The Investor Relations Group
Erika Moran, Investor Relations
Janet Vasquez, Public Relations
"Reproduced with permission - GeoVax Labs, Inc."
GeoVax Labs, Inc.