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MEI Pharma and Kyowa Kirin Report New Clinical Data on Zandelisib at American Society of Clinical Oncology Annual Meeting 2022

– Zandelisib Demonstrated 70.3% Objective Response Rate and 35.2% Complete Response Rate –

– 87.5% of Responses Achieved in First Two Cycles of Therapy, 75% of CRs in First Four Cycles

– 9.9% of Patients Discontinued Therapy Due to a Drug Related Adverse Event –

– 83% Reported Grade 3 Adverse Events of Special Interest in Cycles 1-3

MEI Pharma, Inc. (NASDAQ: MEIP), a late-stage pharmaceutical company focused on advancing new therapies for cancer, and Kyowa Kirin Co., Ltd. (Kyowa Kirin, TSE: 4151), a global specialty pharmaceutical company creating innovative medical solutions utilizing the latest biotechnology, today announced data from the ongoing Phase 2 TIDAL study evaluating the intermittent dosing of zandelisib, an orally administered investigational phosphatidylinositol 3-kinase delta ("PI3Kδ") inhibitor in clinical development for the treatment of B-cell malignancies, is highlighted in a poster and oral discussion session at the American Society of Clinical Oncology (ASCO) 2022 Annual Meeting.

This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20220604005001/en/

(Graphic: Business Wire)

(Graphic: Business Wire)

“The Phase 2 TIDAL data generated to date continue to highlight zandelisib's therapeutic profile and the potential to benefit patients, supporting our commitment to advancing the program and our already ongoing randomized Phase 3 COASTAL study with our partner, Kyowa Kirin," said Richard Ghalie, M.D., chief medical officer of MEI Pharma. "In light of the promising results from TIDAL to date, we remain committed to the zandelisib program with our primary focus being on COASTAL, our ongoing Phase 3, randomized, study evaluating zandelisib in combination with rituximab in follicular and marginal zone lymphoma patients with at least one prior line of therapy.”

“We are very pleased to present data from Phase 2 TIDAL study in ASCO meeting,” said Yoshifumi Torii, Ph.D., Executive Officer, Vice President, Head of R&D Division of Kyowa Kirin. “We continue to see favorable profile of zandelisib that balances efficacy and safety. We remain committed to maximizing the value of zandelisib in B-cell malignancies with our partner MEI Pharma.”

Clinical Data from the Phase 2 TIDAL Study Evaluating Zandelisib in Patients with Relapsed or Refractory Follicular Lymphoma

  • Presentation Title: Efficacy and safety of zandelisib administered by intermittent dosing (ID) in patients with relapsed or refractory (R/R) follicular lymphoma (FL): Primary analysis of the global phase 2 study TIDAL
  • Session Title: Hematologic Malignancies—Lymphoma and Chronic Lymphocytic Leukemia
  • Presenter: Andrew David Zelenetz, Ph.D., M.D.
  • Date and Time: Saturday, June 4, 2022, at 3:00 Central Time
  • Poster ID: 7511 / 165

Study Details

The ongoing TIDAL study (NCT03768505) is a global, open-label Phase 2 trial evaluating zandelisib as a single agent in two disease cohorts: one in relapsed or refractory (r/r) follicular lymphoma (FL) and one for r/r marginal zone lymphoma (MZL), in both cases after failure of at least two prior systemic therapies, including chemotherapy and an anti-CD20 antibody. Patients were administered zandelisib once daily for two 28-day cycles as response induction therapy, followed thereafter by once daily dosing for the first seven days of each subsequent 28-day cycle, a schedule called Intermittent Dosing (ID). Enrollment in the FL cohort is complete; enrollment in the MZL cohort is ongoing.

The FL cohort enrolled a total of 121 patients, with the first 91 consisting of the primary efficacy population (PEP) for the evaluation of overall response rate (ORR) and duration of response (DOR).

The median age of patients enrolled with FL was 64 years old. Enrolled patients were generally heavily pretreated; the median number of prior therapies was 3 (range 2-8) and 96% of patients had received prior chemoimmunotherapy. Further, 28 patients (23%) received prior stem cell transplant, 50 patients (41%) were refractory to last therapy, 41 patients (34%) had tumors ≥5 cm, and 68 patients (56%) were POD24 (progression of disease within 24 months of prior chemoimmunotherapy).

The primary efficacy endpoint is ORR as assessed by independent review committee (IRC) using a modified Lugano criteria. The data cutoff date is September 30, 2021, approximately 6 months after the last patient in the PEP received their first dose of zandelisib. Data from the enrolling MZL cohort is not reported.

Efficacy

The primary endpoint of ORR of zandelisib as a single agent in the PEP was 70.3% (N=64), 95% CI=59.8, 79.5, as assessed by IRC; the complete response rate was 35.2% (N=32), 95% CI=25.4, 45.9. Responses across sub-groups (i.e. response to last treatment, number of prior therapies and POD24) were all >63%.

Response Rates by Independent Review Committee in All PEP Patients and by Subgroup

 

Response to Last

Treatment

Number of Prior

Therapies

POD24

n(%)

Efficacy

Population

(n=91)

Relapsed

(n=49)

Refractory

(n=42)

2 (n=42)

>2 (n=49)

Yes (n=51)

No (n=40)

ORR (CR or PR)

64 (70.3)

37 (75.5)

27 (64.3)

33 (78.6)

31 (63.3)

34 (66.7)

30 (75.0)

CR

32 (35.2)

20 (40.8)

12 (28.6)

18 (42.9)

14 (28.6)

16 (31.4)

16 (40.0)

CR, complete response; PEP, primary efficacy population; POD24 progression of disease within 24 months; PR, partial response.

Responses were first observed in the first two cycles of therapy in 87.5% of all responses (N=56) and 75% of all CRs (N=24) were observed in the first four cycles. As of the data cutoff date, the data are not sufficiently mature to accurately estimate the final DOR in the PEP.

Safety and Tolerability

With a median follow-up of 9.4 months (range 0.8-24) in the safety population of 121 patients, 9.9% (N=12) of patients had discontinued therapy due to any drug-related adverse event. Grade 3 adverse events of special interest (AESI) were diarrhea in 5% (N=6), colitis in 1.7% (N=2), cutaneous rash in 3.3% (N=4), stomatitis in 2.5% (N=3), and 0.8% (N=1) each for AST and ALT elevation, and non-infectious pneumonitis. Grade 3 AESIs primarily (83%, 15 of 18) occurred in cycles 1-3, with only 3 cases reported on ID in Cycles ≥4. No Grade 4 or Grade 5 AESI were recorded.

Treatment-emergent COVID-19 infections were reported in 8.3% (N=10) of patients, and 8.3% (N=10) of patients reported other Grade 3 infections. Four COVID infections were fatal, as were 1 case each of pneumonia and Tumor Lysis Syndrome.

About Zandelisib

Zandelisib, a selective PI3Kδ inhibitor, is an investigational cancer treatment being developed as an oral, once-daily, treatment for patients with B-cell malignancies. Clinical trials are investigating the efficacy and safety of zandelisib as a single agent and in combination with other modalities while administered on an Intermittent Dosing Regimen (ID) and in a time-limited manner when dosed in combination. The ID leverages molecular and biologic properties specific to zandelisib.

In November 2021, MEI Pharma and Kyowa Kirin announced topline data from ongoing Phase 2 TIDAL study (NCT03768505) evaluating zandelisib as a single agent for follicular lymphoma (FL) patients who received at least two prior systemic therapies. Zandelisib demonstrated a 70.3% objective response rate (ORR) as determined by an Independent Review Committee (IRC) assessment in the primary efficacy population (n=91). In addition, 35.2% of patients achieved a complete response. At the time of the data cutoff, the data were insufficiently mature to accurately estimate duration of response (DOR). In line with previously reported data from the Phase 1B study, zandelisib was generally well tolerated. With 9.4 months (range: 0.8-24) median duration of follow-up in the total study population (n=121), interim data demonstrated a discontinuation rate due to any drug related adverse event of 9.9%. Patients enrolled in the study will continue to be followed for safety and DOR.

Ongoing zandelisib studies include the cohort in TIDAL evaluating patients with r/r marginal zone lymphoma (MZL) and continuing evaluation of the cohort of patients in the study with r/r FL. Also ongoing is the Phase 3 COASTAL study (NCT04745832), comparing zandelisib plus rituximab to standard of care chemotherapy plus rituximab in patients with r/r FL or MZL who received more than one prior line of therapy, which must have included an anti-CD20 antibody in combination with chemotherapy or lenalidomide. COASTAL, which is also evaluating time-limited intermittent administration of zandelisib, is intended to support marketing applications in the U.S. and globally.

Other ongoing studies include a Phase 2 pivotal study in Japan (NCT04533581) in patients with indolent B-cell non-Hodgkin's lymphoma (iB-NHL) without small lymphocytic lymphoma (SLL), lymphoplasmacytic lymphoma (LPL), and Waldenström's macroglobulinemia (WM) conducted by Kyowa Kirin.

In March 2020, the FDA granted zandelisib Fast Track designation for the treatment of adult patients with r/r follicular lymphoma who have received at least two prior systemic therapies. In November 2021, the FDA granted zandelisib Orphan Drug designation for the treatment of patients with follicular lymphoma.

In April 2020, MEI and Kyowa Kirin entered a global license, development, and commercialization agreement to further develop and commercialize zandelisib. MEI and Kyowa Kirin will co-develop and co-promote zandelisib in the U.S., with MEI booking all revenue from the U.S. sales. Kyowa Kirin has exclusive commercialization rights outside of the U.S.

About Follicular Lymphoma

Follicular lymphoma (FL) is the most common indolent lymphoma, comprising about 20-30% of all non-Hodgkin lymphomas (NHL). The disease also develops in B lymphocytes, is chronic in most cases and tends to progress slowly. Most people diagnosed with FL are over 65 years of age. Sometimes follicular lymphomas can transform into a more aggressive form of large B-cell lymphoma, a fast-growing (aggressive) type of NHL.

About MEI Pharma

MEI Pharma, Inc. (Nasdaq: MEIP) is a late-stage pharmaceutical company focused on developing potential new therapies for cancer. MEI Pharma's portfolio of drug candidates contains multiple clinical-stage assets, including zandelisib, currently in ongoing clinical trials which may support marketing approvals with the U.S. Food and Drug Administration and other regulatory authorities globally. Each of MEI Pharma's pipeline candidates leverages a different mechanism of action with the objective of developing therapeutic options that are: (1) differentiated, (2) address unmet medical needs and (3) deliver improved benefit to patients either as standalone treatments or in combination with other therapeutic options. For more information, please visit www.meipharma.com. Follow us on Twitter @MEI_Pharma and on LinkedIn.

About Kyowa Kirin

Kyowa Kirin strives to create and deliver novel medicines with life-changing value. As a Japan-based global specialty pharmaceutical company with a heritage of more than 70 years, the company applies cutting-edge science, including expertise in antibody research and engineering, to address the needs of patients across multiple therapeutic areas such as nephrology, oncology, immunology/allergy and neurology. Across its four regions – Japan, Asia Pacific, North America and EMEA/International – Kyowa Kirin focuses on its purpose, to make people smile, and is united by its shared values of commitment to life, teamwork, innovation and integrity. Learn more about the Company at www.kyowakirin.com and on Twitter @KyowaKirin_US and LinkedIn.

Forward-Looking Statements

Under U.S. law, a new drug cannot be marketed until it has been investigated in clinical studies and approved by the FDA as being safe and effective for the intended use. Statements included in this press release that are not historical in nature are "forward-looking statements" within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, including statements regarding the results of our clinical trials of zandelisib, the anticipated timing of our submission of an FDA marketing application for zandelisib, the anticipated timing of the disclosure of the final study data for our Phase 2 TIDAL trial, the timing and success of enrollment for our Phase 3 COASTAL trial, our projected financial position and our expected cash runway, the overall advancement of our product candidates in clinical trials and our plans to continue development of our product candidates. We may in some cases use terms such as “predicts,” “believes,” “potential,” “continue,” “anticipates,” “estimates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “likely,” “will,” “should” or other words that convey uncertainty of the future events or outcomes to identify these forward-looking statements. You should be aware that our actual results could differ materially from those contained in the forward-looking statements, which are based on management's current expectations and are subject to a number of risks and uncertainties, including, but not limited to, our failure to successfully commercialize our product candidates; the availability or appropriateness of utilizing the FDA’s accelerated approval pathway for our product candidates; final data from our pre-clinical studies and completed clinical trials may differ materially from reported interim data from ongoing studies and trials; costs and delays in the development and/ or FDA approval of our product candidates, or the failure to obtain such approval, of our product candidates; uncertainties or differences in interpretation in clinical trial results; the risk that our clinical trials are discontinued or delayed for any reason, including for safety, tolerability, enrollment, manufacturing or economic reasons; the impact of the COVID-19 pandemic on our industry and individual companies, including on our counterparties, the supply chain, the execution of our clinical development programs, our access to financing and the allocation of government resources; our inability to maintain or enter into, and the risks resulting from our dependence upon, collaboration or contractual arrangements necessary for the development, manufacture, commercialization, marketing, sales and distribution of any products; competitive factors; our inability to protect our patents or proprietary rights and obtain necessary rights to third party patents and intellectual property to operate our business; our inability to operate our business without infringing the patents and proprietary rights of others; general economic conditions; the failure of any products to gain market acceptance; our inability to obtain any additional required financing; technological changes; government regulation; changes in industry practice; and one-time events. We do not intend to update any of these factors or to publicly announce the results of any revisions to these forward-looking statements.

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