- New data shows 525 mg dose achieves 95% response rate after the first 10 weeks of monotherapy with leronlimab
- Over 110 patients have reached almost one year of suppressed viral load with monotherapy on original dose of 350 mg or higher dosages
- Half-life of leronlimab is now confirmed at approximately 10 days versus the previous understanding of approximately 3 days
VANCOUVER, Washington, May 06, 2019– CytoDyn Inc. (otc.qb:CYDY), (“CytoDyn” or the “Company”) a late stage biotechnology company developing leronlimab (PRO 140), a CCR5 antagonist with the potential for multiple therapeutic indications, today provided an update on leronlimab (PRO140) as a single agent for maintenance of HIV viral load suppression (HIV-1 RNA < 50 copies/mL).
The latest investigative monotherapy trial has revealed sufficient data to more precisely design the pivotal Phase 3 monotherapy trial that CytoDyn plans to use as the basis for label expansion after the potential approval of leronlimab (PRO140) for HIV patients as a combination therapy with HAART. The longer half-life of leronlimab may help to reduce the number of non-responders in the first ten weeks of monotherapy, if the treatment overlaps with existing regimen of leronlimab for four weeks before initiating monotherapy. Under the current trial protocol, patients have 7 days of overlap with their HAART regimen and leronlimab before initiating monotherapy. Based upon these new findings, the overlap period will be 4 weeks for the pivotal trial protocol. In addition, the latest clinical data demonstrates that the 525 mg dose is no less efficacious than 700 mg, which may potentially offer significant value to patients, payors and providers.
“We are excited to now have this new clinical data that enables us to more precisely design the protocol for our planned pivotal monotherapy trial with leronlimab (PRO140),” said Dr. Nader Pourhassan, Ph.D., CytoDyn President and CEO. “If successful, the pivotal monotherapy trial with leronlimab (PRO140) will hopefully generate the high-quality clinical data needed to underpin a successful potential label expansion, should the FDA approve our first BLA for leronlimab (PRO140) as a combination therapy,” continued Dr. Pourhassan. “We have already filed the first of three parts of the BLA for leronlimab (PRO140) as a combination therapy with HAART for HIV,” concluded Dr. Pourhassan.
About Leronlimab (PRO 140)
The U.S. Food and Drug Administration (FDA) has granted a “Fast Track” designation to leronlimab (PRO 140) as a combination therapy with HAART for HIV-infected patients. Leronlimab (PRO 140) is an investigational humanized IgG4 mAb that blocks CCR5, a cellular receptor that appears to play multiple roles with implications in HIV infection, tumor metastases and immune signaling. Leronlimab (PRO 140) has successfully completed nine Phase 1/2/3 clinical trials in over 700 people, including a successful pivotal Phase 3 trial in combination with standard anti-retroviral therapies in HIV-infected treatment-experienced patients.
In the setting of HIV/AIDS, leronlimab (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. Leronlimab (PRO 140) has been the subject of nine clinical trials, each of which demonstrated that leronlimab can significantly reduce or control HIV viral load in humans. The leronlimab (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 likely plays a central role in tumor invasion and metastasis and that increased CCR5 expression is an indicator of disease status in several cancers. Moreover, research has shown that drugs that block CCR5 can block tumor metastases in laboratory and animal models of aggressive breast and prostate cancer. CytoDyn is conducting additional research with leronlimab (PRO 140) in the cancer setting and plans to initiate additional Phase 2 human clinical trials, in addition to triple-negative breast cancer, when appropriate.
The CCR5 receptor also appears to play a central role in modulating immune cell trafficking to sites of inflammation and may be crucial for the development of acute graft-versus-host disease (GvHD) and other inflammatory conditions. Clinical studies by others further support the concept 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 leronlimab (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 leronlimab (PRO 140) for the prevention of graft-versus-host disease (GvHD).
CytoDyn is a biotechnology company developing innovative treatments for multiple therapeutic indications based on leronlimab (PRO 140), a novel humanized monoclonal antibody targeting the CCR5 receptor. CCR5 appears to play a key role in the ability of HIV to enter and infect healthy T-cells. The CCR5 receptor also appears to be implicated in tumor metastasis and in immune-mediated illnesses, such as graft-vs-host disease (GvHD) and NASH. CytoDyn has successfully completed a Phase 3 pivotal trial with leronlimab (PRO 140) in combination with standard anti-retroviral therapies in HIV-infected treatment-experienced patients. CytoDyn plans to seek FDA approval for leronlimab (PRO 140) in combination therapy and plans to complete the filing of a Biologics License Application (BLA) in 2019 for that indication. CytoDyn is also conducting a Phase 3 investigative trial with leronlimab (PRO 140) as a once-weekly monotherapy for HIV-infected patients and, plans to initiate a registration-directed study of leronlimab monotherapy indication, which if successful, could support a label extension. Clinical results to date from multiple trials have shown that leronlimab (PRO 140) can significantly reduce viral burden in people infected with HIV with no reported drug-related serious adverse events (SAEs). Moreover, results from a Phase 2b clinical trial demonstrated that leronlimab (PRO 140) monotherapy can prevent viral escape in HIV-infected patients, with some patients on leronlimab monotherapy remaining virally suppressed for more than four years. CytoDyn is also conducting a Phase 2 trial to evaluate leronlimab (PRO 140) for the prevention of GvHD and has received clearance to initiate a clinical trial with leronlimab (PRO 140) in metastatic triple-negative breast cancer. More information is at www.cytodyn.com.
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