Patient Treated with Leronlimab (PRO 140) for Metastatic Triple-Negative Breast Cancer under Emergency IND, Launching CytoDyn into Oncology

In Clinical Studies News by Barbara Jacoby

Source: CytoDyn Inc.


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 with metastatic triple-negative breast cancer (“mTNBC”).  The patient will be treated with leronlimab by Jacob Lalezari, M.D., currently Chief Executive Officer of Quest Clinical Research. Dr. Lalezari is also a principal investigator in CytoDyn’s HIV clinical trials with leronlimab.

“This patient has a particularly aggressive type of mTNBC and is being treated under emergency IND regulations of the FDA,” stated Dr. Lalezari.  “With the exciting preclinical studies in cancer metastasis completed by the Company, I believe that leronlimab represents a new potentially therapeutic modality in mTNBC.” Dr. Lalezari has authored more than 75 peer-reviewed articles and been a principal investigator in over 200 clinical trials with a particular focus on first-in-man and proof of concept studies.

The use of leronlimab for mTNBC under the emergency IND by Dr. Lalezari is in addition to the Phase 1b/2 trial with leronlimab for treatment-naïve mTNBC patients under the supervision of Massimo Cristofanilli, M.D., who is an expert in translational research treatment of patients with mTNBC and professor of Medicine in the Division of Hematology/Oncology at Northwestern University Feinberg School of Medicine.  Results from the Phase 1b/2 trial for 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.

“Today marks a milestone in our Company’s history, a first step into the oncology space,” stated CytoDyn President and CEO, Nader Pourhassan, Ph.D.  “It is equally important to note that leronlimab has already completed eight successful clinical trials and has been dosed in over 800 patients in our HIV programs, without any drug-related serious adverse events (SAEs),” he continued.  “With results from multiple preclinical studies in various cancer indications, including mTNBC, we are optimistic about the potential of leronlimab to provide a new therapeutic option to many patients.”

About Leronlimab (PRO 140)
The U.S. Food and Drug Administration (FDA) has granted a “Fast Track” designation to CytoDyn for two potential indications of leronlimab for deadly diseases. The first as a combination therapy with HAART for HIV-infected patients and the second is for metastatic triple-negative breast cancer (mTNBC).  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   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 >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 graft-versus-host disease (GvHD).

About CytoDyn
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 graft-vs-host disease (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 (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 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