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Press release content from Globe Newswire. The AP news staff was not involved in its creation.

CytoDyn Reports Early Results from First Patient in its Phase 1b/2 CCR5+ Metastatic Triple-Negative Breast Cancer Trial

December 3, 2019

First metastatic triple-negative breast cancer patient showed no detectable circulating tumor cells (CTC) or putative metastatic tumor cells (EMTs) in the peripheral blood. Further, a significant reduction in CCR5 expression was demonstrated on cancer-associated cells after eight weeks of treatment with leronlimab

A second patient with metastatic breast cancer has been enrolled under an emergency use investigational new drug

VANCOUVER, Washington, Dec. 03, 2019 (GLOBE NEWSWIRE) -- 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 additional early Phase 1b/2 clinical trial results evaluating leronlimab (PRO 140) patients with CCR5+ metastatic triple-negative breast cancer (mTNBC). Data from the first patient enrolled show no detectable circulating tumor cells (CTC) or EMTs in the peripheral blood and additional reductions in CCR5 expression on cancer-associated cells at eight weeks. A second patient with metastatic breast cancer has been enrolled in the trial under an emergency use investigational new drug (IND).

The first patient in the open label study was given a weekly injection of leronlimab at 700mg along with carboplatin. The patient was enrolled in the trial with CCR5-positive, mTNBC and naïve to chemotherapy in metastatic setting. The patient was previously exposed to anthracyclines and taxane in neoadjuvant and adjuvant settings.

“The fourth blood sample from the mTNBC patient, drawn following eight weeks of treatment, demonstrates a notably sustained response to leronlimab,” said Bruce Patterson, M.D., chief executive officer of IncellDx. “Other cancer-associated macrophage-like (CAML) cells in the blood sample were found at the lower limits of detection and were also decreased in size. Most importantly, the CAML cells had reduced CCR5 staining compared to samples taken from the patient three weeks earlier, reflecting an ongoing blockade of the CCR5 receptor by leronlimab.”

Nader Pourhassan, Ph.D., president and chief executive officer of CytoDyn, stated: “It is very exciting to see additional preliminary results that demonstrate leronlimab’s potential as a therapeutic option to treat mTNBC. We are also pleased to have enrolled a second patient with metastatic breast cancer under an emergency IND. If the results of the second patient are similarly impressive, we plan to file for Breakthrough Therapy designation before the end of January 2020. We have had many patients contact us for treatment under our expanded access protocol and another hospital has opened enrollment for our mTNBC trial. We look forward continuing our research in furtherance of this clinical development plan.”

About Triple-Negative Breast CancerTriple-negative breast cancer (TNBC) is a type of breast cancer characterized by the absence of the three most common types of receptors in the cancer tumor known to fuel most breast cancer growth–estrogen receptors (ER), progesterone receptors (PR) and the hormone epidermal growth factor receptor 2 (HER-2) gene.1 TNBC cancer occurs in about 10 to 20 percent of diagnosed breast cancers and can be more aggressive and more likely to spread and recur.2,3 Since the triple negative tumor cells lack these receptors, common treatments for breast cancer such as hormone therapy and drugs that target estrogen, progesterone, and HER-2 are ineffective.4 Currently, there are no targeted therapies approved to treat triple negative breast cancer.5

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 more than 98 percent 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 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 www.cytodyn.com.

Forward-Looking Statements This press release contains certain forward-looking statements that involve risks, uncertainties, and assumptions that are difficult to predict. Words and expressions reflecting optimism, satisfaction or disappointment with current prospects, as well as words such as “believes,” “hopes,” “intends,” “estimates,” “expects,” “projects,” “plans,” “anticipates” and variations thereof, or the use of future tense, identify forward-looking statements, but their absence does not mean that a statement is not forward-looking. The Company’s forward-looking statements are not guarantees of performance, and actual results could vary materially from those contained in or expressed by such statements due to risks and uncertainties including: (i) the sufficiency of the Company’s cash position, (ii) the Company’s ability to raise additional capital to fund its operations, (iii) the Company’s ability to meet its debt obligations, if any, (iv) the Company’s ability to enter into partnership or licensing arrangements with third parties, (v) the Company’s ability to identify patients to enroll in its clinical trials in a timely fashion, (vi) the Company’s ability to achieve approval of a marketable product, (vii) the design, implementation and conduct of the Company’s clinical trials, (viii) the results of the Company’s clinical trials, including the possibility of unfavorable clinical trial results, (ix) the market for, and marketability of, any product that is approved, (x) the existence or development of vaccines, drugs, or other treatments that are viewed by medical professionals or patients as superior to the Company’s products, (xi) regulatory initiatives, compliance with governmental regulations and the regulatory approval process, (xii) general economic and business conditions, (xiii) changes in foreign, political, and social conditions, and (xiv) various other matters, many of which are beyond the Company’s control. The Company urges investors to consider specifically the various risk factors identified in its most recent Form 10-K, and any risk factors or cautionary statements included in any subsequent Form 10-Q or Form 8-K, filed with the Securities and Exchange Commission. Except as required by law, the Company does not undertake any responsibility to update any forward-looking statements to take into account events or circumstances that occur after the date of this press release.

CONTACTS For more information, visit www.cytodyn.com or contact:

Media: Grace Fotiades LifeSci Public Relations gfotiades@lifescipublicrelations.com (646) 876-5026

Investors: Nader Pourhassan, Ph.D. President & CEO npourhassan@cytodyn.com

1. Triple Negative Breast Cancer. (n.d.). Retrieved from https://www.nationalbreastcancer.org/triple-negative-breast-cancer. 2. Triple Negative Breast Cancer. (n.d.). Retrieved from https://www.nationalbreastcancer.org/triple-negative-breast-cancer. 3. Triple Negative Breast Cancer. (n.d.). Retrieved from https://www.nationalbreastcancer.org/triple-negative-breast-cancer. 4. Triple Negative Breast Cancer. (n.d.). Retrieved from https://www.nationalbreastcancer.org/triple-negative-breast-cancer. 5. Bernstein, L. (2019, February 25). Triple-Negative Breast Cancer: Symptoms, Causes, Treatment, Recurrence. Retrieved from https://www.webmd.com/breast-cancer/triple-negative-breast-cancer#1.