Turnstone Biologics, Inc.

Portfolio Prioritization and Corporate Restructuring Extends Cash Runway into 2Q 2026SAN DIEGO, Nov. 12, 2024 (GLOBE NEWSWIRE) -- Turnstone Biologics Corp. (“Turnstone” or the “Company”) (Nasdaq: TSBX), a clinical-stage biotechnology company developing a differentiated approach to treat and cure patients with solid tumors by pioneering selected tumor-infiltrating lymphocyte (Selected TIL) therapy, today reported financial results for the third quarter ended September 30, 2024, and provided recent business highlights. “Earlier this quarter, we announced a corporate restructuring and the decision to focus resources on our Phase 1 program, TIDAL-01, which we believe puts us on the path to significant value creation. Importantly, our extended cash runway into the second quarter of 2026 enables us to achieve potential key clinical milestones and we remain steadfast in advancing our differentiated approach to TIL therapy for cancer patients with high unmet need,” said Sammy Farah, M.B.A., Ph.D., Turnstone’s President and Chief Executive Officer. “Recently, we reported initial clinical data from our STARLING trial which showcased durable anti-tumor activity in a heavily pre-treated late-line microsatellite stable colorectal cancer patient population, including the achievement of a complete response. The patient remains in remission with progression-free survival extending beyond one year. Our encouraging initial clinical data, combined with results that continue to emerge from within the field in support of selection-based approaches, strengthen the competitive profile of our next-generation selected TIL technology and its potential to treat solid tumors. We look forward to sharing our next clinical update in 1H 2025.” Third Quarter 2024 and Recent Business Highlights Presented at the 2024 Society for Immunotherapy of Cancer (SITC) Annual Meeting – Tumor Infiltrating Lymphocytes (TIL) Symposium, supporting ongoing clinical efforts. On November 6, 2024, Turnstone delivered a presentation titled “TIDAL-01: Enriching for a More Potent TIL Population with Selected TIL therapy” at the SITC TIL Symposium in Houston, TX. The presentation showcased Turnstone’s initial clinical data from its Phase 1 TIDAL-01 program, including the achievement of a complete response in a third-line microsatellite stable metastatic colorectal cancer (“MSS mCRC”) patient. Additionally, two posters were presented at the SITC Annual Meeting with preclinical data that demonstrated the practicality of selecting and expanding tumor-reactive TIL as a potential treatment option for patients with solid tumors. Reported positive initial data from the STARLING Phase 1 Trial of TIDAL-01 in MSS mCRC. In August, initial results were shared from the first 4 evaluable MSS mCRC patients from the STARLING Phase 1 study of TIDAL-01. The trial yielded a 25% overall response rate (“ORR”) with durable clinical benefit and 50% disease control rate (“DCR”) in a heavily pre-treated, advanced disease, third-line setting where patients are unresponsive to checkpoint inhibitors and have almost no treatment options. One patient had a complete response ("CR") and has been progression-free for over one year which is notable in this patient population, while another patient had stable disease (“SD”) for 6 months. As a point of comparison, the current standard of care treatment for this patient population has resulted in an ORR of 1-6% and a median progression-free survival (“mPFS”) of 2-5.6 months. There were also no new safety observations specific to Turnstone’s Selected TILs. Completed strategic restructuring and portfolio review to extend cash runway. In October, Turnstone announced the streamlining of its operations to optimize its portfolio and strengthen its financial position to focus on achieving clinical milestones. Key initiatives include: Pipeline strategy and prioritization: Following a comprehensive evaluation of the business, Turnstone has decided to sharpen its focus on development of the TIDAL-01 program.Organizational restructuring: The Company executed a 60% workforce reduction to prioritize the development of its core Selected TIL program and extend its cash runway.Financial strategy: Turnstone expects its cash runway to support operations and clinical development through the second quarter of 2026.Talent strategy: As part of Turnstone’s updated corporate strategy, Ines Verdon, M.D., Senior Vice President of Clinical Development, is assuming leadership of all clinical activities. Michael Fitch, Ph.D., has been promoted to Senior Vice President of Manufacturing and will oversee all manufacturing and technical operations activities. Wendy Worcester, CPA, is assuming the responsibility of the Finance function as the Principal Financial and Accounting Officer. Saryah Azmat has been promoted to Chief Operating Officer. Third Quarter 2024 Financial Results Cash, cash equivalents and short-term investments: As of September 30, 2024, cash, cash equivalents and short-term investments were $45.3 million. The Company expects that the combined cash, cash equivalents and short-term investments will be sufficient to fund its operations into the second quarter of 2026. Research and development (R&D) expenses: R&D expenses for the three months ended September 30, 2024, were $14.4 million, compared to $14.2 million for the same period in 2023. The increase was due primarily to an increase in manufacturing, clinical, and regulatory costs related to TIDAL-01 clinical trials. General and administrative (G&A) expenses: G&A expenses for the three months ended September 30, 2024, were $3.9 million, compared to $4.8 million for the same period in 2023. The decrease was due primarily to reductions in personnel costs, professional service costs, and other general and administrative costs. Net loss: Net loss for the three months ended September 30, 2024, was $17.0 million, compared to net loss of $17.3 million for the same period in 2023. About Turnstone Turnstone Biologics is a clinical-stage biotechnology company developing a differentiated approach to treat and cure patients with solid tumors by pioneering selected tumor-infiltrating lymphocyte (Selected TIL) therapy. Turnstone’s next-generation TIL therapy is based upon the identification, selection and expansion of the most potent tumor-reactive T cells, known as Selected TILs, and is designed to overcome the limitations of first-generation bulk TIL that have demonstrated objective responses only in limited tumor types. Turnstone’s lead clinical program, TIDAL-01, is currently being evaluated in multiple Phase 1 studies in patients with colorectal cancer, head and neck cancer, and uveal melanoma. For additional information about Turnstone, please visit www.turnstonebio.com, and follow us on LinkedIn. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements expressed or implied in this press release include, but are not limited to, statements regarding: the therapeutic potential for TIDAL-01 to achieve objective responses in solid tumors; the potential for Turnstone’s Selected TILs to efficiently select and expand tumor-reactive TIL to and to effectively apply current TIL therapies across a wider range of solid tumors; the potential of TIDAL-01 as a treatment option for patients with colorectal and gastric cancer; the potential for TIDAL-01 to be superior to current standard of care, if approved; statements related to the results of the workforce reduction and leadership changes; expectations regarding any cost savings resulting from the workforce reduction; Turnstone’s projected cash runway into the second quarter of 2026; and Turnstone’s strategies and objectives. All statements, other than statements of historical fact, contained in this press release, including statements regarding future events, future financial performance, business strategy and plans, and objectives for future operations, are forward-looking statements and can be identifies by terminology such as “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will” or “would,” or the negative of these terms or other comparable terminology. These statements are based on the current plans, objectives, estimates, expectations and intentions, beliefs and assumptions of our management team, and on information currently available to such management team and are not guarantees of future performance and inherently involve numerous risks and uncertainties, many of which are beyond Turnstone’s control. We undertake no obligation to update or revise publicly any of the forward-looking statements after the date hereof to conform the statements to actual results or changed expectations except as required by law. The reader is cautioned not to place undue reliance on forward-looking statements. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, but are not limited to, risks and uncertainties related to: macroeconomic conditions and the effects of global health concerns, such as global pandemics; Turnstone’s ability to initiate and execute clinical trials on the anticipated timelines, if at all; the potential for results from clinical trials to differ from preclinical, early clinical, preliminary or expected results; the significant uncertainty associated with Turnstone’s product candidates ever receiving any regulatory approvals; Turnstone’s ability to obtain, maintain or protect intellectual property rights related to its product candidates; impediments to the Company’s ability to execute the workforce reduction as currently contemplated, the Company’s ability to achieve projected cost savings in connection with the workforce reduction, unintended consequences from the workforce reduction that impact the Company’s business; the sufficiency of Turnstone’s capital resources and need for additional capital to achieve its goals; and other risks, including those described under the heading “Risk Factors” in Turnstone’s Annual Report on Form 10-K or Quarterly Reports on Form 10-Q filed with the SEC and other documents Turnstone has filed, or will file, with the SEC. . This press release discusses product candidates that are under clinical study and which have not yet been approved for marketing by the U.S. Food and Drug Administration. No representation is made as to the safety or effectiveness of these product candidates for the uses for which they are being studied. Contact: Ahmed AneiziInvestor RelationsTurnstone Biologics(347) 897-5988ahmed.aneizi@turnstonebio.com Condensed Consolidated Statement of Operations and Comprehensive Income (Loss)(unaudited)(In thousands, except share and per share data) Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Collaboration revenue$- $- $- $19,306 Operating expenses Research and development 14,424 14,172 47,944 47,033 General and administrative 3,944 4,758 13,172 13,449 Total operating expenses 18,368 18,930 61,116 60,482 Loss from operations (18,368) (18,930) (61,116) (41,176) Other income, net 520 1,578 2,353 2305 Net loss before income taxes (17,848) (17,352) (58,763) (38,871) Benefit for income taxes 816 33 798 121 Net loss$(17,032) $(17,319) $(57,965) $(38,750) Other comprehensive income (loss) 30 (8) (77) 172 Total comprehensive loss$(17,002) $(17,327) $(58,042) $(38,578) Net loss attributable to common stockholder, basic and diluted (17,032) (17,319) (57,965) (38,789) Weighted-average shares of common stock outstanding, basic and diluted 23,037,714 17,397,845 23,029,106 7,730,694 Net loss per share attributable to common stockholders, basic and diluted$(0.74) $(1.00) $(2.52) $(5.02) Condensed Consolidated Balance Sheet(unaudited)( In thousands) September 30, 2024December 31, 2023 Cash and cash equivalents and short-term investments$45,284$94,777 Total assets 58,484 112,815 Total liabilities 14,843 14,148 Total stockholders' deficit 43,641 98,667

Just over a year after going public, Turnstone Biologics is axing staff, adjusting its leadership team and changing its pipeline focus to extend its cash runway for another two years. The San Diego biotech is reducing its headcount by around 60%, according to a Friday release . The terminations should be complete by the end of the year and will cost $2.3 million in severance-related fees. The drugmaker had 82 full-time employees at the end of June, according to an SEC filing . Separately, several members of Turnstone’s executive team are also stepping down, including interim Chief Medical Officer Michael Burgess, who is retiring, and Chief Financial Officer Venkat Ramanan. The company’s interim chief technology officer, Vijay Chiruvolu, is shifting to an advisory role, while Chief Business Officer Saryah Azmat has been promoted to chief operating officer. Turnstone is shifting resources away from its preclinical work to focus on advancing its Phase 1 tumor-infiltrating lymphocyte therapy asset, TIDAL-01. The candidate is in several studies in patients with colorectal cancer, head and neck cancer and uveal melanoma. The next milestone is a data update in the first half of next year. These moves should help Turnstone finance its activities through the second quarter of 2026, the company said. The biotech had just $62.4 million in cash, equivalents and short-term investments at the end of June. In August, the drugmaker released data in four metastatic microsatellite stable colorectal cancer patients showing TIDAL-01 achieved a 25% overall response rate and 50% disease control rate. At the time, Leerink analysts said they were “encouraged” by the responses but questioned “the extent of TIDAL-01 contribution to the benefit” because the patients were also receiving chemotherapy-based bridging treatment and short courses of immunotherapy. “Maintaining a 25% response rate in substantially more patients…would meaningfully increase our enthusiasm into a necessary financing round,” the analysts added. Turnstone debuted on the public markets in July last year with a $75 million IPO. The biotech had had a tough few years prior to that, losing key partnerships with AbbVie and Takeda . Turnstone’s stock $TSBX plummeted around 82% year to date.

Realigning resources to focus on clinical advancement of Selected TIL therapyReducing employee headcount by approximately 60%Streamlining operations with cash runway expected to extend into 2Q 2026 SAN DIEGO, Oct. 11, 2024 (GLOBE NEWSWIRE) -- Turnstone Biologics Corp. (“Turnstone” or the “Company”) (Nasdaq: TSBX), a clinical-stage biotechnology company developing a differentiated approach to treat and cure patients with solid tumors by pioneering selected tumor-infiltrating lymphocyte (Selected TIL) therapy, today announced a strategic prioritization of its pipeline, as well as a workforce reduction of approximately 60% and changes to its leadership team, to focus resources on the continued advancement of its Phase 1 program, TIDAL-01. As a result of the restructuring initiatives that align with the Company’s near-term goals, the anticipated cost savings are expected to extend its cash runway into the second quarter of 2026 and maximize shareholder value. “Following a comprehensive evaluation of our business operations, we have decided to prioritize our pipeline and sharpen our clinical focus,” said Sammy Farah, M.B.A., Ph.D., Turnstone’s President and Chief Executive Officer. “As a result, we have made the decision to streamline our team, align resources towards manufacturing and clinical development, and optimize our cost structure. We expect these changes will extend our cash runway by three additional quarters, further enabling us to build upon our encouraging initial Phase 1 data, which demonstrated the potential of our Selected TILs in high unmet need solid tumors and potentially generate near-term value for our shareholders, while continuing to shape a strong company for the future.” Dr. Farah added: “These mission-driven measures impact a number of our talented colleagues. I would like to convey my gratitude for their innumerable contributions to Turnstone, their commitment to patients with solid tumors, and I wish them the very best in their future endeavors.” The comprehensive review of the Company’s corporate outlook and pipeline have outlined the following key strategic decisions: Portfolio Prioritization The Company will direct resources towards advancing the development of its clinical program, TIDAL-01, over other preclinical pipeline assets. Turnstone’s Selected TIL process is designed to utilize a novel unbiased identification and functional screening method to isolate and selectively expand the greatest breadth of the most potent tumor-reactive TIL from the patient’s tumor in vitro, before infusing them into the patient for more targeted tumor killing.Turnstone recently reported initial positive data from the STARLING trial that support the biological hypothesis for TIL selection and warrant further development. The initial data showcased the achievement of a complete response in a heavily pre-treated late-line microsatellite stable colorectal cancer (MSS-CRC) patient with progression free survival extending beyond one year.TIDAL-01 is currently being evaluated in multiple Phase 1 trials including patients with colorectal cancer, head and neck cancer, and uveal melanoma, and the Company expects to provide a clinical update in the first half of 2025. Workforce Reduction Turnstone is executing an approximately 60% reduction in its workforce. The Company expects that the combined efforts from the corporate reorganization and clinical program prioritization will extend cash runway into the second quarter of 2026. Leadership Transitions Ines Verdon, M.D., Senior Vice President of Clinical Development, is assuming leadership of all clinical activities. Dr. Verdon joined Turnstone in 2022 and has more than 20 years of academic and pharmaceutical industry oncology and cell therapy experience. Michael Burgess, MBChB, Ph.D., is retiring as Interim Chief Medical Officer and will continue to serve as a member of the Turnstone Board of Directors.Michael Fitch, Ph.D., has been promoted to Senior Vice President of Manufacturing and will oversee all manufacturing and technical operations activities. Dr. Fitch joined Turnstone in 2023, bringing almost 20 years of biotechnology and pharmaceutical industry experience, including approximately a decade in cell therapy technical operations, CMC (Chemistry, Manufacturing, and Controls), and manufacturing. Vijay Chiruvolu, Ph.D., Interim Chief Technology Officer, has completed his agreed to term of service with Turnstone and is moving into a strategic advisory role for the Company.Wendy Worcester, CPA, current Vice President of Finance, will assume responsibility of the Finance function as the Principal Financial and Accounting Officer. Ms. Worcester joined Turnstone in 2022 and is a skilled business and finance professional with over 20 years of financial and accounting experience. Venkat Ramanan, Ph.D., will be stepping down from his role as Chief Financial Officer.Saryah Azmat has been promoted to Chief Operating Officer. Ms. Azmat served as the Company’s Chief Business Officer since 2021, and prior to this, as the Company’s Senior Vice President of Business Development and Corporate Strategy from 2019 to 2021. About Turnstone Turnstone Biologics is a clinical-stage biotechnology company developing a differentiated approach to treat and cure patients with solid tumors by pioneering selected tumor-infiltrating lymphocyte (Selected TIL) therapy. Turnstone’s next-generation TIL therapy is based upon the identification, selection and expansion of the most potent tumor-reactive T cells, known as Selected TILs, and is designed to overcome the limitations of first-generation bulk TIL that have demonstrated objective responses only in limited tumor types. Turnstone’s lead clinical program, TIDAL-01, is currently being evaluated in multiple Phase 1 studies in patients with colorectal cancer, head and neck cancer, and uveal melanoma. For additional information about Turnstone, please visit www.turnstonebio.com, and follow us on LinkedIn. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements expressed or implied in this press release include, but are not limited to, statements related to the results of the workforce reduction and leadership changes, expectations regarding any cost savings resulting from the workforce reduction, the therapeutic potential for TIDAL-01, the potential for Turnstone’s Selected TILs to efficiently select and expand tumor-reactive TILs; the potential of TIDAL-01 as a treatment option for patients with colorectal cancer, head and neck cancer and uveal melanoma, the anticipated timing of a clinical update from the Phase 1 trials of TIDAL-01, the expected cash runway, and Turnstone’s strategies and objectives. All statements, other than statements of historical fact, contained in this press release, including statements regarding future events, future financial performance, business strategy and plans, and objectives for future operations, are forward-looking statements and can be identifies by terminology such as “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will” or “would,” or the negative of these terms or other comparable terminology. These statements are based on the current plans, objectives, estimates, expectations and intentions, beliefs and assumptions of our management team, and on information currently available to such management team and are not guarantees of future performance and inherently involve numerous risks and uncertainties, many of which are beyond Turnstone’s control. We undertake no obligation to update or revise publicly any of the forward-looking statements after the date hereof to conform the statements to actual results or changed expectations except as required by law. The reader is cautioned not to place undue reliance on forward-looking statements. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, but are not limited to, risks and uncertainties related to: impediments to the Company’s ability to execute the workforce reduction as currently contemplated, the Company’s ability to achieve projected cost savings in connection with the workforce reduction, unintended consequences from the workforce reduction that impact the Company’s business, macroeconomic conditions and the effects of global health concerns, such as global pandemics; Turnstone’s ability to initiate and execute clinical trials on the anticipated timelines, if at all; the potential for results from clinical trials to differ from preclinical, early clinical, initial, preliminary or expected results; the significant uncertainty associated with Turnstone’s product candidates ever receiving any regulatory approvals; Turnstone’s ability to obtain, maintain or protect intellectual property rights related to its product candidates; the sufficiency of Turnstone’s capital resources and need for additional capital to achieve its goals; and other risks, including those described under the heading “Risk Factors” in Turnstone’s Annual Report on Form 10-K and Quarterly Reports on Form 10-Q and other documents Turnstone has filed, or will file, with the SEC. Contact Ahmed AneiziInvestor RelationsTurnstone Biologics(347) 897-5988ahmed.aneizi@turnstonebio.com