It’s a very rewarding trading day for investors in Inovio Pharmaceuticals Inc (NASDAQ:INO) with shares up over 35%, making the stock Wall Street’s bull of the day. The reason? The drug maker announced this morning that its HIV vaccine, PENNVAX®-GP, produced amongst the highest overall levels of immune response rates (cellular and humoral) ever demonstrated in a human study by an HIV vaccine. The vaccine candidate, PENNVAX-GP, consists of a combination of four HIV antigens designed to cover multiple global HIV strains and generate both an antibody (humoral) immune response as well as a T cell (cellular) immune response to both potentially prevent and treat HIV.

These preliminary results are from a study supported by the HIV Vaccine Trials Network (HVTN) and the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health (NIH) in collaboration with Inovio. The study evaluated a four-dose regimen of PENNVAX-GP DNA vaccine administered by intradermal (ID) or intramuscular (IM) administration in combination with a DNA encoded immune activator, IL-12 (INO-9012). Overall, 71 of 76 (93%) evaluable vaccinated participants showed a CD4+ or CD8+ cellular immune response to at least one of the vaccine antigens (env A, env C, gag, or pol). Similarly, 62 of 66 (94%) evaluated participants demonstrated an env specific antibody response. None of the placebo recipients (0 of 9; 0%) demonstrated either a cellular or an antibody response in the study. Notably, amongst the participants receiving PENNVAX-GP vaccine and IL-12 with intradermal immunization, 27 of 28 (96%) participants demonstrated a cellular response and 27 of 28 (96%) demonstrated an HIV env specific antibody response.

Amongst the evaluated participants receiving PENNVAX-GP and IL-12 via IM vaccination, 27 of 27 (100%) demonstrated a cellular response and 19 of 21 (90%) demonstrated an env specific antibody response. Similar immune responses and response rates were achieved via both ID and IM administration of the vaccine although participants vaccinated via intradermal vaccine administration received 1/5ththe dose of vaccine compared to those vaccinated via intramuscular administration.

This breakthrough data was presented at a plenary session at the 2017 HVTN Spring Full Group Meeting on May 23 in Washington, D.C. by the Protocol Co-Chair of the HVTN 098 study, Dr. Stephen De Rosa, Research Associate Professor, Laboratory Medicine at the University of Washington and Fred Hutchinson Cancer Research Center. The HVTN 098 trial was the first clinical study of PENNVAX-GP. The randomized, placebo-controlled multi-center study enrolled 94 subjects (85 vaccine and 9 placebo) to characterize and optimize PENNVAX-GP immunization regimens delivered through vaccinations using either intramuscular or intradermal delivery.

Dr. De Rosa, said, “The preliminary results of HVTN 098 are remarkable for a number of reasons. In HVTN 098, nearly all individuals vaccinated with the regimens including IL-12 had detectable CD4 responses and over half had CD8 T cell responses. Similarly, the antibody response rate was 100% or close to 100% for several of the env antigens tested in the assay. Thus, these high response rates are exceptional. Further studies will be needed to determine if this vaccine candidate can safely and effectively prevent HIV infection.”

Dr. J. Joseph Kim, Inovio’s President & CEO, said, “These results are among the highest ever  responses we’ve seen with an HIV vaccine, and they are remarkably consistent with our recent data reported from our Ebola, Zika and MERS clinical trials in terms of demonstrating nearly 100% vaccine response rates with very favorable safety profile. Furthermore, our newer and more tolerable intradermal vaccine delivery device showed that we can elicit very high immune responses at a much lower dose. We look forward to advancing PENNVAX-GP into later-stage clinical development with our partners and collaborators.”

Development of Inovio’s PENNVAX-GP immunotherapy, which widely targets multiple major clades of HIV — providing global coverage — has been funded through a $25 million NIAID contract previously awarded in 2009 to Inovio and its collaborators. In addition, Inovio and its collaborators were awarded an additional five-year $16 million Integrated Preclinical/Clinical AIDS Vaccine Development (IPCAVD) grant in 2015 from NIAID.

On the ratings front, INO has been the subject of a number of recent research reports. In a report issued on May 17, Aegis analyst Difei Yang reiterated a Buy rating on the stock, with a price target of $11, which implies an upside of 54% from current levels. On May 11, Maxim’s Jason McCarthy reiterated a Buy rating on the stock and has a price target of $10.

According to TipRanks.com, which ranks over 7,500 financial analysts and bloggers to gauge the performance of their past recommendations, Difei Yang and Jason McCarthy have a yearly average return of 5.9% and a loss of 12.6% respectively. Yang has a success rate of 44% and is ranked #738 out of 4560 analysts, while McCarthy has a success rate of 34% and is ranked #4494.

Overall, one research analyst has assigned a Hold rating and 4 research analysts have given a Buy rating to the stock. When considering if perhaps the stock is under or overvalued, the average price target is $11.00 which is 54.3% above where the stock closed yesterday.

Inovio Pharmaceuticals, Inc. is a bio pharmaceutical company. It develops active DNA immunotherapies for cancer and infectious diseases. The company’s portfolio of immune therapies includes SynCon immunotherapies and electroporation delivery systems. Its pipeline consists vgx-3100, ino-3122, ino-3106, pennvax-b and pennvax-g.