As of December 31, 2022, the Company had cash and cash equivalents of approximately $11.8 million. The Company’s activities since inception have consisted principally of acquiring product and technology rights, raising capital, and performing research and development. Successful completion of the Company’s development programs and, ultimately, the attainment of profitable operations are dependent on future events, including, among other things, its ability to access potential markets; secure financing; successfully progress its product candidates through preclinical and clinical development; obtain regulatory approval of one or more of its product candidates; maintain and enforce intellectual property rights; develop a customer base; attract, retain and motivate qualified personnel; and develop strategic alliances and collaborations. From inception, the Company has been funded by a combination of equity and debt financings.

On March 16, 2021, the Company issued an aggregate of 3,228,286 shares of its common stock, for net proceeds of $52.6 million.

In August 2021, the Company entered into a Controlled Equity Offering^SM Sales Agreement (the “ATM Agreement”) with Cantor Fitzgerald & Co. and RBC Capital Markets, LLC (the “Sales Agents”), pursuant to which the Company can offer and sell, from time to time at its sole discretion through the Sales Agents, shares of its common stock having an aggregate offering price of up to $75.0 million. Any shares of its common stock sold will be issued pursuant to the Company’s shelf registration statement on Form S-3 (File No. 333-258687), which the SEC declared effective on August 19, 2021; however, our use of the shelf registration statement on Form S-3 will be limited for so long as we are subject to General Instruction I.B.6 of Form S-3, which limits the amounts that we may sell under the registration statement and in accordance with the ATM agreement. The Sales Agents will be entitled to compensation under the Sales Agreement at a commission rate equal to 3.0% of the gross sales price per share sold under the ATM Agreement, and the Company has provided each of the Sales Agents with indemnification and contribution rights. During the year ended December 31, 2022, the Company sold 60,651 shares of its common stock under the ATM Agreement for net proceeds of $0.2 million.

In August 2021, the Company received notice of a Product Development Research award totaling approximately $13.1 million from the Cancer Prevention and Research Institute of Texas (“CPRIT”) to support the Company’s Phase 2 clinical trial of MT-401. The CPRIT award is intended to support the adjuvant arm of the Company’s Phase 2 clinical trial evaluating MT-401 when given as an adjuvant therapy to patients with acute myeloid leukemia following a hematopoietic stem cell transplant. The primary objectives of the adjuvant arm of the trial are to evaluate relapse-free survival after MT-401 treatment when compared with a randomized control group. Through

the date of this filing, the Company has received $4.8 million of funds from the CPRIT grant. The Company recorded $3.4 million of grant income related to the CPRIT grant as revenue for the year ended December 31, 2022.

On April 21, 2022, the Company entered into a binding services agreement (the “Services Agreement”), dated April 12, 2022 (see Note 9), with Wilson Wolf Manufacturing Corporation (“Wilson Wolf”). Mr. John Wilson is a member of the Company’s board of directors and is serving as the CEO of Wilson Wolf, therefore Wilson Wolf is a related party. Pursuant to the Services Agreement, Wilson Wolf made a cash payment to the Company in the amount of $8.0 million. For the year ending December 31, 2022, the Company recognized $5.5 million of revenue pursuant to this agreement and at December 31, 2022, the Company recorded $2.5 million of related party deferred revenue on its consolidated balance sheet.

On September 13, 2022, the Company received notice from the U.S. Food and Drug Administration (the “FDA”) that it had awarded the Company a $2.0 million grant from the FDA’s Orphan Products Grant program to support the Company’s Phase 2 clinical trial of MT-401 for the treatment of post-transplant AML. The Company recorded $0.1 million of grant income related to the FDA grant as revenue for the year ended December 31, 2022 and at December 31, 2022, the Company recorded $0.1 million of grant income receivable. On March 13, 2023, the Company received $0.1 million of funds from the FDA grant.

On December 12, 2022, the Company entered into a purchase agreement, or the Purchase Agreement, with Lincoln Park Capital Fund, LLC, or Lincoln Park, which provides that, upon the terms and subject to the conditions of the agreement, the Company has the right, but not the obligation, to sell to Lincoln Park up to $25,000,000 of shares of its common stock, or the Purchase Shares, from time to time over a 24-month term. For the year ended December 31, 2022, the Company did not sell any shares of its common stock under the Purchase Agreement. In January 2023, Lincoln Park was issued 180,410 shares of stock as a commitment fee at a value of $0.5 million.

The Company expects to continue to incur substantial losses over the next several years during its development phase. To fully execute its business plan, the Company will need to complete certain research and development activities and clinical trials. Further, the Company’s product candidates will require regulatory approval prior to commercialization. These activities will span many years and require substantial expenditures to complete and may ultimately be unsuccessful. Any delays in completing these activities could adversely impact the Company. The Company plans to meet its capital requirements primarily through issuances of debt and equity securities and, in the longer term, revenue from sales of its product candidates, if approved.

Based on the Company’s clinical and research and development plans and its timing expectations related to the progress of its programs, the Company expects that its cash and cash equivalents as of December 31, 2022 will enable the Company to fund its operating expenses and capital expenditure requirements into the third quarter of 2023, as such these factors raise substantial doubt regarding the Company’s ability to continue as a going concern. In an effort to further preserve the Company’s working capital, the Company’s employees took a portion of their 2022 earned bonus in the form of equity in lieu of cash.

The Company has based this estimate on assumptions that may prove to be wrong, and the Company could utilize its available capital resources sooner than it currently expects. Furthermore, the Company’s operating plan may change, and it may need additional funds sooner than planned in order to meet operational needs and capital requirements for product development and commercialization. Because of the numerous risks and uncertainties associated with the development and commercialization of the Company’s product candidates and the extent to which the Company may enter into additional collaborations with third parties to participate in their development and commercialization, the Company is unable to estimate the amounts of increased capital outlays and operating expenditures associated with its current and anticipated clinical trials. The Company’s future funding requirements will depend on many factors, as it:

These factors raise substantial doubt regarding the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. The accompanying consolidated financial statements have been prepared on a going concern basis, which implies that the Company will continue to realize its assets and discharge its liabilities in the normal course of business. The consolidated financial statements do not include any adjustments to the recoverability and classification of recorded asset amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern.

In addition to the foregoing, based on the Company’s current assessment, the Company does not expect any material impact on its long-term liquidity due to the COVID-19 pandemic. However, the Company will continue to assess the effect of the pandemic on its operations, including its clinical programs. Further, the COVID-19 pandemic, decades-high inflation and concerns about an economic recession in the United States or other major markets has resulted in, among other things, volatility in the capital markets that may have the effect of reducing the Company’s ability to access capital, which could in the future negatively affect the Company’s liquidity. In addition, a recession or market correction due to these factors could materially affect the Company’s business and the value of its common stock.