CytoDyn Announces Significantly Improved Response Rate at Higher Dose of PRO 140 in HIV Phase 3 Monotherapy Trial
-- Response rate increases from 40% at 350 mg dose to approximately 70% at 525 mg -- IRB approves monotherapy protocol modified to include 700 mg dose -- PRO 140 monotherapy, if approved, will allow patients to self-administer once per week at home without need for daily pills
VANCOUVER, Washington, July 30, 2018 (GLOBE NEWSWIRE) -- CytoDyn Inc. (OTC.QB: CYDY), a biotechnology company developing a novel humanized CCR5 monoclonal antibody for multiple therapeutic indications, announces clearance from the independent Institutional Review Board (IRB) overseeing its CD03 Phase 3 investigative monotherapy trial to increase the weekly PRO 140 dose from 525 mg to 700 mg for newly enrolled patients. Current participants in the trial who failed to maintain suppressed HIV viral load on a lower dose of PRO 140 will be permitted to continue in the trial with a higher dose. The objective of this trial is to assess the efficacy, safety and tolerability of PRO 140 as a long-acting, single-agent maintenance therapy for the chronic suppression of HIV.
“This IRB decision is exciting for patients, our Company and our shareholders, given the potential for a higher patient response rate with PRO 140 as a single agent at the 700 mg dose level,” said Nader Pourhassan, Ph.D., CytoDyn’s president and chief executive officer. “Approximately 70% of trial participants who started with PRO 140 at the 525 mg dose and have been treated between one and nine months are achieving HIV viral load suppression. This response rate is very promising and we are excited to evaluate PRO 140 at an even a higher dose.”
Dr. Pourhassan noted that the exact response rates for PRO 140 at 525 mg could vary as the trial progresses. To date, there has been a clear distinction between patient response rates with PRO 140 at the lower 350 mg and higher 525 mg doses. CytoDyn believes that dosing PRO 140 at the 700 mg dose has the potential to achieve an even higher response rate than the approximate 70% currently observed at the 525 mg dose.
“We are able to increase the dose of PRO 140 due to its positive safety profile in prior clinical trials,” Dr. Pourhassan commented. “That was among the important factors considered by the IRB in providing this clearance.”
Patients enrolled in the Phase 3 monotherapy trial were prescreened for CCR5-tropic HIV-1 infection and suppressed HIV viral load under an existing highly active antiretroviral therapy (HAART) regimen. CytoDyn initiated the trial treating patients with weekly PRO 140 at 350 mg and found that approximately 40% were able to maintain suppressed HIV viral load. Following treatment of the first 150 patients, the protocol was revised to increase the weekly dose of PRO 140 to 525 mg. Patients who were non-responders to PRO 140 at the 350 mg dose were given the opportunity to switch to the higher 525 mg dose, and a majority were able to re-suppress with the higher dose.
“We were pleased that more than 20 patients achieved re-suppressed HIV viral load on PRO 140 525 mg dose after failing the lower PRO 140 350 mg dose and were able to continue in the trial,” said Dr. Pourhassan. “Also of note, patients who achieve suppressed HIV viral load after 10 weeks tend to maintain suppressed viral load. Interestingly, some patients in our Phase 2b extension study are now achieving suppressed HIV viral load for nearly four years with PRO 140 as a single agent.”
“Of key importance in the Phase 3 monotherapy trial, all non-responders to PRO 140 have safely achieved suppressed HIV viral load upon returning to their prior HAART regimens before PRO 140 monotherapy,” said Jacob Lalezari, M.D., Director of Quest Clinical Research, Assistant Clinical Professor of Medicine at UCSF/Mount Zion Hospital and principal investigator of CytoDyn’s Phase 2 monotherapy trial. “This is a major achievement as patients continue to have options for maintaining HIV viral load suppression.”
About CytoDynCytoDyn is a biotechnology company focused on the clinical development and potential commercialization of humanized monoclonal antibodies for the treatment and prevention of HIV infection. The Company has one of the leading monoclonal antibodies under development for HIV infection, PRO 140, which has completed Phase 2 clinical trials with demonstrated antiviral activity in humans and is currently in Phase 3 development. PRO 140 blocks the HIV co-receptor CCR5 on T cells, which prevents viral entry. Clinical trial results thus far indicate that PRO 140 does not negatively affect the normal immune functions that are mediated by CCR5. Results from seven Phase 1 and Phase 2 human clinical trials have shown that PRO 140 can significantly reduce viral burden in people infected with HIV. A recent Phase 2b clinical trial demonstrated that PRO 140 can prevent viral escape in patients during several months of interruption from conventional drug therapy. CytoDyn intends to continue to develop PRO 140 as a therapeutic anti-viral agent in persons infected with HIV and to pursue non-HIV, inflammatory indications where CCR5 and its ligand CCL5 may be involved. For more information on the Company, please visit http://www.cytodyn.com.
About PRO 140PRO 140 is a humanized IgG4 monoclonal antibody that blocks CCR5, a cellular receptor that plays multiple roles with implications in HIV infection, tumor metastasis, and immune signaling.
In the setting of HIV/AIDS, PRO 140 belongs to a new class of therapeutics called viral-entry inhibitors; it masks CCR5, thus protecting healthy T cells from viral infection by blocking the predominant HIV (R5) subtype from entering those cells. At the same time, PRO 140 does not appear to interfere with the normal function of CCR5 in mediating immune responses. PRO 140 has been the subject of seven clinical trials, each demonstrating efficacy by significantly reducing or controlling HIV viral load in human test subjects. PRO 140 has been designated a “fast track” product by the FDA. The PRO 140 antibody appears to be a powerful antiviral agent leading to potentially fewer side effects and less frequent dosing requirements compared with daily drug therapies currently in use.
In the setting of cancer, research has shown that CCR5 plays a central role in tumor invasion and metastasis, and that an increased CCR5 is an indicator of disease status in several cancers. Moreover, researchers have shown that drugs that block CCR5, including PRO 140, can block tumor metastases in laboratory and animal models of aggressive breast and prostate cancer. CytoDyn is conducting additional research with PRO 140 in the cancer setting and plans to initiate Phase 2 human clinical trials when appropriate.
The CCR5 receptor also plays a central role in modulating immune cell trafficking to sites of inflammation, and it is crucial for the development of acute graft-versus-host disease (GvHD) and other inflammatory conditions. Clinical studies by others have shown that blocking CCR5 using a chemical inhibitor can reduce the clinical impact of acute GvHD without significantly affecting the engraftment of transplanted bone marrow stem cells. CytoDyn is currently conducting a Phase 2 clinical study with PRO 140 to further support the concept that the CCR5 receptor on engrafted cells is critical for the development of acute GvHD, and that blocking this receptor from recognizing certain immune signaling molecules is a viable approach to mitigating acute GvHD. The FDA has granted orphan drug designation to PRO 140 for the prevention of graft-versus-host disease (GvHD).
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