TScan Therapeutics Reports Second Quarter 2025 Financial Results and Provides Corporate Update

Two-year relapse data from ALLOHA™ Phase 1 heme trial to be presented by end of year Expects to dose first solid tumor patients with multiplex TCR-T in the third quarter of 2025 Cash, cash equivalents, and marketable securities continue to fund operations into the first quarter of 2027 WALTHAM, Mass., Aug. 12, 2025 (GLOBE NEWSWIRE) -- TScan Therapeutics, Inc. (Nasdaq: TCRX), a clinical-stage biotechnology company focused on the development of T cell receptor (TCR)-engineered T cell (TCR-T) therapies for the treatment of patients with cancer, today reported financial results for the second quarter ended June 30, 2025, and provided a corporate update. “We expect to dose our first solid tumor patients with multiplex TCR-T in the third quarter of this year,” said Gavin MacBeath, Ph.D., Chief Executive Officer. “We are currently enrolling into three different multiplex cohorts in our PLEXI-T trial and plan to share safety and preliminary response data in the first quarter of 2026. In parallel, we are finalizing our commercial-ready process for our heme program, which results in shorter manufacturing times and substantially lower cost of goods, and look forward to presenting updated data on our ALLOHA study by the end of the year.” Upcoming Anticipated Milestones Heme Malignancies Program: TScan’s lead TCR-T therapy candidate, TSC-101, is designed to treat residual disease and prevent relapse in patients with acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), or myelodysplastic syndrome (MDS) undergoing allogeneic hematopoietic cell transplantation (HCT) (the ALLOHA trial, NCT05473910). Plans to initiate a registrational trial for TSC-101, pending further feedback from regulatory authorities, in the second half of 2025.Expects to file an investigational new drug (IND) application for TSC-102-A0301, a TCR-T targeting an HLA-A*03:01-restricted epitope on CD45, in the second half of 2025.Plans to present additional data from the ALLOHA Phase 1 trial, including two-year relapse data on the initial patients treated with TSC-101, by the end of the year. Solid Tumor Program: TScan continues to develop the ImmunoBank, a collection of TCR-T therapy candidates that target different cancer-associated antigens presented on diverse HLA types. TScan’s strategy is to treat patients with multiple TCR-T therapy candidates to overcome tumor heterogeneity and resistance that may arise from either target or HLA loss (the PLEXI-T trial, NCT05973487). Expects to dose first patients with multiplex TCR-T in the third quarter of 2025.Plans to share initial safety and response data in the first quarter of 2026. Second Quarter 2025 Financial Results Revenue: Revenue for the second quarter of 2025 was $3.1 million, compared to $0.5 million for the second quarter of 2024. The increase was primarily due to timing of research activities pursuant to the Company’s collaboration agreement with Amgen. R&D Expenses: Research and development (R&D) expenses for the second quarter of 2025 were $32.6 million, compared to $26.9 million for the second quarter of 2024. The increase of $5.8 million was primarily driven by an increase in laboratory supplies, research materials and studies expenses due to ongoing activities with a global contract development and manufacturing organization, as well as an increase in facility-related and personnel expenses associated with continued expansion of internal manufacturing capabilities. R&D expenses included non-cash stock compensation expense of $1.7 million and $1.2 million for the second quarter of 2025 and 2024, respectively. G&A Expenses: General and administrative (G&A) expenses for the second quarter of 2025 were $9.1 million, compared to $7.8 million for the second quarter of 2024. The increase of $1.3 million was primarily driven by an increase in personnel expenses due to increased headcount to support business activities. G&A expenses included non-cash stock compensation expense of $1.6 million and $1.1 million for the second quarter of 2025 and 2024, respectively. Net Loss: Net loss was $37.0 million for the second quarter of 2025, compared to $31.7 million for the second quarter of 2024, and included net interest income of $1.7 million and $2.5 million, respectively. Cash Position: Cash, cash equivalents, and marketable securities as of June 30, 2025, were $218.0 million, excluding $5.0 million of restricted cash. The Company believes that its existing cash resources will be sufficient to fund its current operating plan into the first quarter of 2027. Share Count: As of June 30, 2025, the Company had 56,747,993 shares of common stock outstanding, consisting of 52,471,405 shares of voting common stock and 4,276,588 shares of non-voting common stock. In addition, the Company had 73,087,945 of pre-funded warrants outstanding to purchase shares of voting common stock at an exercise price of $0.0001 per share. Pro forma outstanding shares as of June 30, 2025, inclusive of both common stock and pre-funded warrants, were 129,835,938. About TScan Therapeutics, Inc. TScan is a clinical-stage biotechnology company focused on the development of T cell receptor (TCR)-engineered T cell (TCR-T) therapies for the treatment of patients with cancer. The Company’s lead TCR-T therapy candidates are in development for the treatment of patients with hematologic malignancies to prevent relapse following allogeneic hematopoietic cell transplantation (the ALLOHA™ Phase 1 heme trial). The Company has developed and continues to expand its ImmunoBank, the Company’s repository of therapeutic TCRs that recognize diverse targets and are associated with multiple HLA types, to provide customized multiplex TCR-T therapies for patients with a variety of cancers (the PLEXI-T™ Phase 1 solid tumor trial). The Company is currently enrolling patients into both clinical programs. Forward-Looking Statements This release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including, but not limited to, express or implied statements regarding the Company’s plans, progress, expectations, and timing relating to the Company’s hematologic malignancies program, including clinical updates of the ALLOHA Phase 1 heme trial, presentation of data, opening of expansion cohorts, filing of an IND for TSC-102-A0301, and initiation of a registrational trial for TSC-101; the Company’s plans, progress, expectations and timing relating to the Company’s solid tumor program, including clinical updates of the PLEXI-T Phase 1 solid tumor trial, enrolling and dosing multiplex patients, and presentation of data; the progress of the hematologic malignancies and solid tumor programs being indicative or predictive of the success of each program; the Company’s current and future research and development plans or expectations; the structure, timing and success of the Company’s planned preclinical development, submission of INDs, and clinical trials; the potential benefits of any of the Company’s proprietary platforms, multiplexing, or current or future product candidates in treating patients; the Company’s ability to fund its operating plan into the first quarter of 2027 with its existing cash, cash equivalents, and marketable securities; and the Company’s goals, strategy and anticipated financial performance. TScan intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. In some cases, you can identify forward-looking statements by terms such as, but not limited to, “may,” “might,” “will,” “objective,” “intend,” “should,” “could,” “can,” “would,” “expect,” “believe,” “anticipate,” “project,” “target,” “design,” “estimate,” “predict,” “potential,” “plan,” “on track,” or similar expressions or the negative of those terms. Such forward-looking statements are based upon current expectations that involve risks, changes in circumstances, assumptions, and uncertainties. The express or implied forward-looking statements included in this release are only predictions and are subject to a number of risks, uncertainties and assumptions, including, without limitation: the beneficial characteristics, safety, efficacy, therapeutic effects and potential advantages of TScan’s TCR-T therapy product candidates; TScan’s expectations regarding its preclinical studies being predictive of clinical trial results; TScan’s approved INDs being indicative or predictive of bringing TScan closer to its goal of providing customized TCR-T therapies to treat patients with cancer; the timing of the launch, initiation, progress, expected results and announcements of TScan’s preclinical studies, clinical trials and its research and development programs; TScan’s ability to enroll patients for its clinical trials within its expected timeline; TScan’s plans relating to developing and commercializing its TCR-T therapy product candidates, if approved, including sales strategy; estimates of the size of the addressable market for TScan’s TCR-T therapy product candidates; TScan’s manufacturing capabilities and the scalable nature of its manufacturing process; TScan’s estimates regarding expenses, future milestone payments and revenue, capital requirements and needs for additional financing; TScan’s expectations regarding competition; TScan’s anticipated growth strategies; TScan’s ability to attract or retain key personnel; TScan’s ability to establish and maintain development partnerships and collaborations; TScan’s expectations regarding federal, state and foreign regulatory requirements; TScan’s ability to obtain and maintain intellectual property protection for its proprietary platform technology and our product candidates; the sufficiency of TScan’s existing capital resources to fund its future operating expenses and capital expenditure requirements; and other factors that are described in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of TScan’s most recent Annual Report on Form 10-K and any other filings that TScan has made or may make with the SEC in the future. Any forward-looking statements contained in this release represent TScan’s views only as of the date hereof and should not be relied upon as representing its views as of any subsequent date. Except as required by law, TScan explicitly disclaims any obligation to update any forward-looking statements. Contacts Heather Savelle TScan Therapeutics, Inc. VP, Investor Relations 857-399-9840 hsavelle@tscan.com Melissa Forst Argot Partners 212-600-1902 TScan@argotpartners.com TScan Therapeutics, Inc.Condensed Consolidated Balance Sheet Data(unaudited, in thousands, except share amount) June 30, 2025 December 31, 2024 Assets Cash and cash equivalents$169,394 $178,689 Other assets 129,167 192,429 Total assets$298,561 $371,118 Liabilities and Stockholders' Equity Total liabilities$121,847 $130,148 Total stockholders' equity 176,714 240,970 Total liabilities and stockholders' deficit$298,561 $371,118 Common stock and pre-funded warrants outstanding (1) 129,835,938 129,678,572 (1) Includes at June 30, 2025 and December 31, 2024, 73,087,945 issued and outstanding pre-funded warrants to purchase shares of voting common stock at an exercise price of $0.0001 per share. TScan Therapeutics, Inc.Condensed Consolidated Statements of Operations(unaudited, in thousands, except share and per share amounts) Three Months EndedJune 30, 2025 2024 Revenue: Collaboration and license revenue$3,076 $536 Operating expenses: Research and development 32,634 26,877 General and administrative 9,095 7,773 Total operating expenses 41,729 34,650 Loss from operations (38,653) (34,114)Interest and other income, net 2,390 3,405 Interest expense (689) (952)Net loss$(36,952) $(31,661)Net loss per share, basic and diluted$(0.28) $(0.28)Weighted average common shares outstanding—basic and diluted (2) 129,730,451 113,425,357 (2) For the three months ended June 30, 2025 and 2024, 73,087,945 and 65,587,945 shares of the Company's voting common stock issuable upon exercise of pre-funded warrants are included as outstanding common stock in the calculation of basic and diluted net loss per share.

TScan Therapeutics Reports Second Quarter 2025 Financial Results and Provides Corporate Update

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