-- MEI Begins Third Fiscal Quarter with $124 Million in Cash --

MEI Pharma, Inc. (Nasdaq: MEIP), a clinical-stage pharmaceutical company focused on advancing new therapies for cancer, today reported results for the quarter ended December 31, 2022, and highlighted recent corporate events.

“MEI anticipates reporting key clinical data readouts on two clinical-stage oncology candidates, voruciclib and ME-344, around the end of the calendar year for each program,” said Daniel P. Gold, Ph.D., president and chief executive officer of MEI Pharma. “These clinical data will inform future plans in two promising areas of oncology drug development: CDK9 inhibition and mitochondrial inhibition, respectively. With approximately $124 million at the end of the quarter, we remain well capitalized to pursue these objectives and estimate that we will be able to fund operations for two years based upon our current development plans.”

Second Quarter Fiscal Year 2023 Recent Developments

• In December 2022, MEI Pharma and Kyowa Kirin announced that after receiving the most recent guidance in a late November meeting with the U.S. Food and Drug Administration, the companies jointly decided to discontinue global development of zandelisib, an orally administered investigational phosphatidylinositol 3-kinase delta ("PI3Kδ") inhibitor, outside of Japan for B-cell malignancies. Kyowa Kirin is continuing the Phase 2 MIRAGE study evaluating Japanese patients with relapsed or refractory indolent B-cell non-Hodgkin lymphomas, and will explore the potential for a marketing authorization submission to Japanese health authorities based on data from the MIRAGE and TIDAL clinical trials.
• In December 2022, MEI announced that it is realigning its clinical development efforts following the discontinuation of global development outside Japan of zandelisib. As part of the announced program realignment and workforce reduction, the company is resizing its organization to support continued development of voruciclib and ME-344, while concurrently supporting the winding down of the zandelisib program outside of Japan. The company additionally announced that it had engaged Torreya Partners as financial advisor to help explore additional strategic opportunities.
• In December 2022, MEI received notice from the U.S. Food and Drug Administration that it may proceed to initiate the Phase 1 study evaluating ME-344 plus Avastin®(bevacizumab) in relapsed colorectal cancer patients. The study is expected to dose the first patient in the first half of calendar year 2023.
• In November 2022, MEI dosed the first patient in the Phase 1b study evaluating voruciclib in combination with Venclexta® (venetoclax), a BCL2 inhibitor. Initially the study is evaluating patients with acute myeloid leukemia (AML) after failure of prior standard therapies to assess safety and possible synergies for the combination treatment. Pending results from this ongoing study, the company may also evaluate the combination in patients across multiple indications with relapsed and refractory B-cell malignancies.
• In November 2022, MEI and Kyowa Kirin announced topline data from the Phase 2 MIRAGE study evaluating zandelisib in Japanese patients with indolent B-cell Non-Hodgkin’s Lymphoma without small lymphocytic lymphoma, lymphoplasmacytic lymphoma, and Waldenström's macroglobulinemia in Japan. The data demonstrated a 75.4% objective response rate and 24.6% of patients achieved a complete response as determined by Independent Review Committee assessment. Additionally, 14.8% of patients discontinued therapy due to any treatment emergent adverse event.

Expected Drug Candidate Pipeline Developments

Voruciclib – Oral CDK9 inhibitor for the treatment of B-cell malignancies and acute myeloid leukemia

• Report key clinical data from the ongoing Phase 1b trial evaluating voruciclib plus Venclexta® (venetoclax) in patients with acute myeloid leukemia around calendar year-end 2023.

ME-344 – Tumor selective mitochondrial inhibitor

• Initiate a Phase 1b clinical trial evaluating ME-344 plus Avastin® in relapsed colorectal cancer patients in the first half of calendar year 2023.
• Report key clinical data from the Phase 1b clinical trial evaluating ME-344 plus Avastin in patients with relapsed colorectal cancer around calendar year-end 2023.

Zandelisib – Oral PI3K delta inhibitor for the treatment of indolent B-cell Non-Hodgkin’s Lymphoma without small lymphocytic lymphoma, lymphoplasmacytic lymphoma, and Waldenström's macroglobulinemia in Japan

• Provide an update on Kyowa Kirin’s plans for continued zandelisib development in Japan for patients with relapsed or refractory indolent B-cell non-Hodgkin lymphomas.

Second Quarter Fiscal Year 2023 Financial Results

• As of December 31, 2022, MEI had $124.2 million in cash, cash equivalents, and short-term investments with no outstanding debt.
• For the quarter ended December 31, 2022, cash used in operations was $14.3 million, compared to $18.6 million used in operations (after adjusting for the receipt of a $10.0 million milestone payment from Kyowa Kirin during the quarter ended December 31, 2021). The decrease in cash used in operations is due to a reduction in zandelisib costs as we discontinued the program and initiated the close down of development activities and changes in working capital.
• Research and development expenses were $15.3 million for the quarter ended December 31, 2022, compared to $21.5 million for the quarter ended December 31, 2021. The decrease was primarily related to a reduction in zandelisib costs as we discontinued the program and initiated the closing down of development activities during the quarter ended December 31, 2022.
• General and administrative expenses were $8.5 million for the quarter ended December 31, 2022, compared to $7.9 million for the quarter ended December 31, 2021. The increase primarily relates to personnel costs, including costs related to severance from a workforce reduction, professional services and general corporate expenses.
• MEI recognized revenue of $32.7 million for the quarter ended December 31, 2022, compared to $11.8 million for the quarter ended December 31, 2021. As a result of the discontinuation of the zandelisib program, we updated our estimated costs to complete each development performance obligation under the license agreement with Kyowa Kirin. This resulted in a higher progress towards completion and revenue for performance obligations that will not commence.
• Net income was $10.3 million, or $0.08 per share, for the quarter ended December 31, 2022, compared to net loss of $12.2 million, or $0.10 per share for the quarter ended December 31, 2021. The Company had 133,260,865 shares of common stock outstanding as of December 31, 2022, compared with 132,904,545 shares as of December 31, 2021.
• The adjusted net income (a non-GAAP measure) for the quarter ended December 31, 2022, excluding non-cash expenses related to changes in the fair value of the warrants, was $9.8 million, compared to an adjusted net loss of $17.6 million for the quarter ended December 31, 2021.

About MEI Pharma

MEI Pharma, Inc. (Nasdaq: MEIP) is a clinical-stage pharmaceutical company focused on developing potential new therapies for cancer. MEI Pharma's portfolio of drug candidates includes clinical stage candidates with differentiated or novel mechanisms of action intended to address unmet medical needs and 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.

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, without limitation, statements regarding: the potential, safety, efficacy, and regulatory and clinical progress of zandelisib and our other product candidates, including the anticipated timing for initiation of clinical trials and release of clinical trial data and our expectations surrounding potential regulatory submissions, approvals and timing thereof, our business strategy and plans; and the sufficiency of our cash, cash equivalents and short-term investments to fund our operations. 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, or the failure to obtain such approval, of our product candidates; uncertainties or differences in interpretation in clinical trial results; adverse effects on the Company's business as a result of the restatement of our previously issued financial statements; uncertainty regarding the impact of rising inflation and the increase in interest rates as a result; 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.

Non-GAAP Financial Measures

To supplement our financial statements, which are prepared and presented in accordance with generally accepted accounting principles in the United States ("GAAP"), we provide investors with a non-GAAP financial measure, adjusted net income (loss), which we believe is helpful to our investors. We use adjusted net income (loss) for financial and operational decision-making purposes and as a means to evaluate period-to-period comparisons. We believe this non-GAAP financial measure provides useful information about our operating results, enhances the overall understanding of past financial performance and future prospects and allows for greater transparency with respect to metrics used by our management in its financial and operational decision-making.

The presentation of adjusted net income (loss) is not meant to be considered in isolation or as a substitute for net loss, the directly comparable financial measure prepared in accordance with GAAP. While we believe adjusted net income (loss) is an important tool for financial and operational decision-making and for evaluating our own operating results over different periods of time, we urge investors to review the reconciliation of this financial measures to the comparable GAAP financial measures included below, and not to rely on any single financial measure to evaluate our business.

We define adjusted net income (loss) as net income (loss), adjusted to exclude non-cash expenses related to changes in the fair value of the warrants. We have presented adjusted net income (loss) because we believe excluding the non-cash expenses related to changes in the fair value of warrants can produce a useful measure for period-to-period comparisons of our business.

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