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 announced today the injection of the first patient in a Phase 1b/2 clinical protocol with treatment-naïve metastatic triple-negative breast cancer (mTNBC).
The treatment of the first patient in mTNBC with leronlimab took place under the care of Dr. Jacob Lalezari, M.D. Dr Lalezari is a scientific advisor to CytoDyn and current Chief Executive Officer of Quest Clinical Research. Dr. Lalezari has authored more than 75 peer-reviewed articles and served as a principal investigator in over 200 clinical trials with a particular focus on first-in-man and proof of concept studies. Dr. Lalezari is also principle investigator for CytoDyn’s HIV monotherapy trial.
Results from this ongoing trial in mTNBC will dictate the Company’s regulatory pathway, including the potential to seek Breakthrough Therapy Designation and accelerated approval with the U.S. Food and Drug Administration (FDA) for the use of leronlimab in mTNBC. Leronlimab has been granted Fast Track designation for mTNBC by the FDA based on a greater than 98% reduction of metastatic tumor volume in a murine xenograft model. Circulating Tumor Cells (CTC) will be evaluated in each patient every three weeks.
“There is a growing body of evidence about the role of CCR5 in cancer and, in particular, how CCR5 blockade by a drug like leronlimab could have a multitude of anti-tumor effects including inhibition of immune inhibitory T-cells and promotion of anti-tumor activity by macrophages. These activities are synergistic with the exciting new class of immune-oncology drugs,” stated Bruce Patterson, M.D., CEO of IncellDX.
“Today marks a crucial milestone in our company’s history, launching CytoDyn into clinical development in the oncology space,” stated CytoDyn President and CEO, Nader Pourhassan, Ph.D. “It is important to note that leronlimab has completed nine successful clinical trials and has been dosed in over 800 patients in our HIV programs, without a single drug-related serious adverse event (SAE),” he continued. “With this safety record and results from multiple pre-clinical trials in various cancer indications, including mTNBC, and other indications like NASH and GvHD, we are optimistic about the potential of leronlimab to provide a new therapeutic option for the roughly 37,000 women that are diagnosed with triple-negative breast cancer each year in the United States. We wish to thank the women who have agreed to participate in our trials and endeavor to provide each of them with clinical benefit. Along with our current mTNBC trial, CytoDyn will continue to enroll cancer patients under the expanded access program.”
About Leronlimab (PRO 140)
The U.S. Food and Drug Administration (FDA) have granted a “Fast Track” designation to CytoDyn for two potential indications of leronlimab for deadly diseases. The first as a combination therapy with highly active antiretroviral therapy (HAART) for HIV-infected patients and the second is for metastatic triple-negative breast cancer. Leronlimab is an investigational humanized IgG4 mAb that blocks CCR5, a cellular receptor that is important in HIV infection, tumor metastases, and other diseases including non-alcoholic steatohepatitis (NASH). Leronlimab has successfully completed nine clinical trials in over 800 people, including meeting its primary endpoints in a pivotal Phase 3 trial (leronlimab in combination with standard anti-retroviral therapies in HIV-infected treatment-experienced patients).
In the setting of HIV/AIDS, leronlimab is a viral-entry inhibitor; it masks CCR5, thus protecting healthy T cells from viral infection by blocking the predominant HIV (R5) subtype from entering those cells. Leronlimab 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 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 an important role in tumor invasion and metastasis. Increased CCR5 expression is an indicator of disease status in several cancers. Published studies have shown that blocking CCR5 can reduce tumor metastases in laboratory and animal models of aggressive breast and prostate cancer. Leronlimab reduced human breast cancer metastasis by more than 98% in a murine xenograft model. CytoDyn is therefore conducting a Phase 2 human clinical trial in metastatic triple-negative breast cancer and was granted Fast Track designation in May 2019. Additional research is being conducted with leronlimab in the setting of cancer and NASH with plans to conduct additional clinical studies when appropriate.
The CCR5 receptor appears to play a central role in modulating immune cell trafficking to sites of inflammation and may be important in 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 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 for the prevention of GvHD.
CytoDyn is a biotechnology company developing innovative treatments for multiple therapeutic indications based on leronlimab, 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 GvHD and NASH. CytoDyn has successfully completed a Phase 3 pivotal trial with leronlimab in combination with standard anti-retroviral therapies in HIV-infected treatment-experienced patients. CytoDyn plans to seek FDA approval for leronlimab 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 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 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 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 for the prevention of GvHD and has received clearance to initiate a clinical trial with leronlimab in metastatic triple-negative breast cancer. More information is at www.cytodyn.com.
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