CLN-619

CLN-978 program now actively enrolling across Phase 1 studies in systemic lupus erythematosus (SLE), rheumatoid arthritis (RA) and Sjögren’s disease BCMA-directed bispecific T cell engager velinotamig in-licensed from Genrix Bio Zipalertinib REZILIENT1 pivotal results shared in oral presentation at ASCO 2025 and in Journal of Clinical Oncology; multiple new data sets across a range of disease settings to be shared at IASLC 2025 WCLC and ESMO Congress 2025 Company appoints Mittie Doyle, M.D., and Andrew Allen, M.D., Ph.D., to its Board of Directors CAMBRIDGE, Mass., Aug. 07, 2025 (GLOBE NEWSWIRE) -- Cullinan Therapeutics, Inc. (Nasdaq: CGEM; “Cullinan”), a biopharmaceutical company focused on developing modality-agnostic targeted therapies, today provided an update on recent and anticipated business highlights and announced its financial results for the second quarter ended June 30, 2025. “I am proud of the team’s strong execution throughout the first half of the year as we continue to advance the CLN-978 program across three active studies in SLE, RA, and Sjögren’s disease. With the addition of velinotamig, we further solidified our leadership position in the development of T cell engagers for autoimmune diseases. With these two programs, our portfolio covers the entire breadth of the B cell compartment. Recent data presented at the European Alliance of Associations for Rheumatology (EULAR) meeting reinforced the potential of T cell engagers as disease-modifying therapies across a wide spectrum of autoimmune diseases,” said Nadim Ahmed, Chief Executive Officer of Cullinan Therapeutics. “We also continue making important progress across our oncology portfolio, recently sharing results from the pivotal Phase 2b portion of the REZILIENT1 study of zipalertinib at the 2025 ASCO Annual Meeting, and we look forward to sharing multiple new data sets at upcoming medical conferences. Pending discussions with the U.S. FDA, our partner Taiho plans to submit an NDA in relapsed EGFR ex20ins NSCLC later this year and expects to complete enrollment of the frontline study REZILIENT3 in the first half of 2026. We also plan to share clinical data for CLN-049, our FLT3xCD3 bispecific T cell engager, in patients with relapsed/refractory AML and MDS later this year. With $510.9 million in cash and investments and runway into 2028, we have the resources to generate multiple value-driving catalysts near term and beyond across both our immunology and oncology programs. Lastly, I am pleased to welcome Drs. Mittie Doyle and Andrew Allen to our Board of Directors. They are proven leaders with deep strategic and development expertise in immunology and oncology, respectively, and I believe their contributions will be invaluable as we continue to advance our programs. I would also like to thank Drs. Anne-Marie Martin and David Ryan for their contributions to our progress and success over the last several years.” Portfolio Highlights Immunology CLN-978 (CD19xCD3 bispecific T cell engager): Systemic lupus erythematosus, rheumatoid arthritis, and Sjögren’s disease The global Phase 1 study in patients with moderate to severe SLE is enrolling in the United States, Europe, and Australia, and the Company plans to share initial safety data and B cell depletion data from Part A of the study in Q4 2025. The Phase 1 study in patients with active, difficult-to-treat rheumatoid arthritis is enrolling in Europe. This company-sponsored study is being led by sites at FAU Erlangen-Nuremberg in Germany and Università Cattolica del Sacro Cuore in Italy. The Company plans to share initial data from this study during the first half of 2026. The global Phase 1 study in patients with active, moderate to severe Sjögren’s disease is enrolling in the U.S. and is now also active in Europe following recent regulatory approval. Velinotamig (BCMAxCD3 bispecific T cell engager): Autoimmune diseases In June 2025, the Company entered into an agreement with Genrix Bio for an exclusive global (ex-Greater China) license to velinotamig. Under the agreement, Cullinan paid Genrix Bio an upfront license fee of $20 million. In the future, Genrix Bio will also be eligible to receive up to $292 million in development and regulatory milestones plus up to an additional $400 million in sales-based milestones, as well as tiered royalties on potential ex-Greater China net sales. Genrix Bio plans to initiate a Phase 1 study in patients with autoimmune diseases in China by the end of 2025. Cullinan intends to use the data generated to accelerate global clinical development of the program. Following the completion of the Genrix Bio Phase 1 study, Cullinan will conduct all further development of velinotamig in autoimmune diseases. The global Phase 1 study in patients with moderate to severe SLE is enrolling in the United States, Europe, and Australia, and the Company plans to share initial safety data and B cell depletion data from Part A of the study in Q4 2025. The Phase 1 study in patients with active, difficult-to-treat rheumatoid arthritis is enrolling in Europe. This company-sponsored study is being led by sites at FAU Erlangen-Nuremberg in Germany and Università Cattolica del Sacro Cuore in Italy. The Company plans to share initial data from this study during the first half of 2026. The global Phase 1 study in patients with active, moderate to severe Sjögren’s disease is enrolling in the U.S. and is now also active in Europe following recent regulatory approval. In June 2025, the Company entered into an agreement with Genrix Bio for an exclusive global (ex-Greater China) license to velinotamig. Under the agreement, Cullinan paid Genrix Bio an upfront license fee of $20 million. In the future, Genrix Bio will also be eligible to receive up to $292 million in development and regulatory milestones plus up to an additional $400 million in sales-based milestones, as well as tiered royalties on potential ex-Greater China net sales. Genrix Bio plans to initiate a Phase 1 study in patients with autoimmune diseases in China by the end of 2025. Cullinan intends to use the data generated to accelerate global clinical development of the program. Following the completion of the Genrix Bio Phase 1 study, Cullinan will conduct all further development of velinotamig in autoimmune diseases. Oncology Zipalertinib (EGFR ex20ins inhibitor), collaboration with Taiho Oncology: EGFR ex20ins NSCLC In June 2025, results from the pivotal Phase 2b portion of REZILIENT1 in patients with EGFR ex20ins NSCLC who have received prior therapy were shared at the 2025 ASCO Annual Meeting and published simultaneously in the Journal of Clinical Oncology. Cullinan plans to share updated efficacy and safety data in patients previously treated with amivantamab during a mini oral abstract session at the IASLC 2025 WCLC. Pending discussions with the U.S. Food and Drug Administration, Taiho plans to submit an NDA in relapsed EGFR ex20ins NSCLC by the end of 2025. Taiho expects to complete enrollment of the pivotal study REZILIENT3 in 1L EGFR ex20ins NSCLC in the first half of 2026. Taiho plans to share initial data from the REZILIENT2 cohort exploring zipalertinib in patients with uncommon EGFR mutations during a mini oral abstract session at the IASLC 2025 WCLC. Taiho also plans to share initial data from the REZILIENT2 cohort exploring zipalertinib in patients with active brain metastases at the ESMO Congress 2025. CLN-049 (FLT3xCD3 bispecific T cell engager): Acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS) Enrollment continues in the Phase 1 study in patients with relapsed/refractory AML or MDS and the company plans to share clinical data from this study in Q4 2025. Enrollment also continues in the Phase 1 study in patients with measurable minimal residual disease in AML. CLN-619 (Anti-MICA/MICB monoclonal antibody): NSCLC and multiple myeloma Enrollment continues in the Phase 1 expansion cohorts in patients with NSCLC and the Phase 1 study in patients with relapsed/refractory multiple myeloma. CLN-617 (IL-2 and IL-12 cytokine fusion protein): Solid tumors Enrollment continues in the Phase 1 study in patients with advanced solid tumors. In June 2025, results from the pivotal Phase 2b portion of REZILIENT1 in patients with EGFR ex20ins NSCLC who have received prior therapy were shared at the 2025 ASCO Annual Meeting and published simultaneously in the Journal of Clinical Oncology. Cullinan plans to share updated efficacy and safety data in patients previously treated with amivantamab during a mini oral abstract session at the IASLC 2025 WCLC. Pending discussions with the U.S. Food and Drug Administration, Taiho plans to submit an NDA in relapsed EGFR ex20ins NSCLC by the end of 2025. Taiho expects to complete enrollment of the pivotal study REZILIENT3 in 1L EGFR ex20ins NSCLC in the first half of 2026. Taiho plans to share initial data from the REZILIENT2 cohort exploring zipalertinib in patients with uncommon EGFR mutations during a mini oral abstract session at the IASLC 2025 WCLC. Taiho also plans to share initial data from the REZILIENT2 cohort exploring zipalertinib in patients with active brain metastases at the ESMO Congress 2025. Enrollment continues in the Phase 1 study in patients with relapsed/refractory AML or MDS and the company plans to share clinical data from this study in Q4 2025. Enrollment also continues in the Phase 1 study in patients with measurable minimal residual disease in AML. Enrollment continues in the Phase 1 expansion cohorts in patients with NSCLC and the Phase 1 study in patients with relapsed/refractory multiple myeloma. Enrollment continues in the Phase 1 study in patients with advanced solid tumors. Corporate Updates Mittie Doyle, M.D., and Andrew Allen, M.D., Ph.D., were appointed to the Board of Directors, effective August 7, 2025. Both board directors bring significant leadership experience, with Dr. Doyle having extensive immunology clinical development expertise, and Dr. Allen with extensive oncology clinical development experience. Anne-Marie Martin, Ph.D., and David Ryan, M.D., will resign from Cullinan’s Board of Directors effective August 7, 2025. Second Quarter 2025 Financial Results Cash Position: Cash, cash equivalents, short- and long-term investments, and interest receivable were $510.9 million as of June 30, 2025. Cullinan continues to expect its cash resources to provide runway into 2028 based on its current operating plan. R&D Expenses: Research and development expenses were $61.0 million for the second quarter of 2025, compared to $36.3 million for the same period in 2024. G&A Expenses: General and administrative expenses were $14.8 million for the second quarter of 2025, compared to $13.8 million for the same period in 2024. Net Loss: Net loss attributable to Cullinan was $70.1 million for the second quarter of 2025, compared to $42.0 million for the same period in 2024. About Cullinan Therapeutics Cullinan Therapeutics, Inc. (Nasdaq: CGEM) is a biopharmaceutical company dedicated to creating new standards of care for patients. Cullinan has strategically built a diversified portfolio of clinical-stage assets that inhibit key drivers of disease or harness the immune system to eliminate diseased cells in both autoimmune diseases and cancer. Cullinan’s portfolio encompasses a wide range of modalities, each with the potential to be best and/or first in class. Anchored in a deep understanding of oncology, immunology, and translational medicine, we create differentiated ideas, identify the most appropriate targets, and select the optimal modality to develop transformative therapeutics across a wide variety of autoimmune and cancer indications. We push conventional boundaries from candidate selection to differentiated therapeutic, applying rigorous go/no go criteria at each stage of development to fast-track only the most promising molecules to the clinic and, ultimately, commercialization. With deep scientific expertise, our teams exercise creativity and urgency to deliver on our promise to bring new therapeutic solutions to patients. Learn more about Cullinan at https://cullinantherapeutics.com/, and follow us on LinkedIn and X. Forward-Looking Statements This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. These forward-looking statements include, but are not limited to, express or implied statements regarding the company’s beliefs and expectations regarding: our preclinical and clinical developments plans and timelines for our product candidates, the clinical and therapeutic potential of our product candidates, the strategy of our product candidates, our research and development activities, our plans regarding future data presentations, our cash runway, and other statements that are not historical facts. The words “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “plan,” “potential,” “project,” “pursue,” “will,” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this press release are based on management's current expectations and beliefs of future events and are subject to known and unknown risks and uncertainties that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. These risks include, but are not limited to, the following: uncertainty regarding the timing and results of regulatory submissions; the risk that any INDs, NDAs or other global regulatory submissions we may file with the United States Food and Drug Administration or other global regulatory agencies are not cleared on our expected timelines, or at all; the success of our clinical trials and preclinical studies; the risks related to our ability to protect and maintain our intellectual property position; the risks related to manufacturing, supply, and distribution of our product candidates; the risk that any one or more of our product candidates, including those that are co-developed, will not be successfully developed and commercialized; the risk that the results of preclinical studies or clinical studies will not be predictive of future results in connection with future studies; the effect of changes in global economic conditions, including uncertainties related to international trade policies, tariffs and supply chain dynamics on our business and operations; and the success of any collaboration, partnership, license or similar agreements. These and other important risks and uncertainties discussed in our filings with the Securities and Exchange Commission, including under the caption “Risk Factors” in our most recent Annual Report on Form 10-K and subsequent filings with the SEC, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change, except to the extent required by law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release. Moreover, except as required by law, neither the company nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements included in this press release. Any forward-looking statement included in this press release speaks only as of the date on which it was made. Contacts: InvestorsNick Smith+1 401.241.3516nsmith@cullinantx.com Media  Rose Weldon +1 215.801.7644 rweldon@cullinantx.com

Company received approval from European Medicines Agency (EMA) for CLN-978; Phase 1 study in active, difficult-to-treat rheumatoid arthritis to initiate in Q2 2025 CLN-978 expands into Sjögren’s disease; Phase 1 study in active, moderate to severe patients to initiate in the U.S. in Q2 2025 Zipalertinib REZILIENT1 results to be shared in oral presentation at 2025 ASCO Annual Meeting CAMBRIDGE, Mass., May 08, 2025 (GLOBE NEWSWIRE) -- Cullinan Therapeutics, Inc. (Nasdaq: CGEM; “Cullinan”), a biopharmaceutical company focused on developing modality-agnostic targeted therapies, today reported recent and anticipated business highlights and announced its financial results for the first quarter ended March 31, 2025. “As a leader in T cell engager development for autoimmune diseases, we continue to rapidly advance our global clinical development of CLN-978 in several autoimmune diseases and across multiple geographies. With an extensive global network of clinical investigators, CLN-978 is now in active clinical development in systemic lupus erythematosus (SLE), rheumatoid arthritis and Sjögren’s disease and we expect to deliver initial clinical data in SLE by the end of the year,” said Nadim Ahmed, Chief Executive Officer of Cullinan Therapeutics. “In parallel, we continue to advance and refine our oncology programs. We recently announced that the pivotal Phase 2b portion of the REZILIENT1 study of zipalertinib met the primary endpoint of overall response rate. Together with our partner Taiho, we will share the results in an oral presentation at the 2025 ASCO Annual Meeting. For CLN-619, our MICA/B antibody, we are narrowing the scope of the program, which will allow for reallocation of resources. With $567.4 million in cash and investments and runway into 2028, we have the resources required to maintain our leadership position in autoimmune diseases and deliver meaningful value-driving catalysts across both our immunology and oncology programs.” Portfolio Highlights Immunology CLN-978 (CD19xCD3 T cell engager): Systemic lupus erythematosus, rheumatoid arthritis, and Sjögren’s disease The global Phase 1 study in patients with moderate to severe SLE is ongoing in the United States, Europe, and Australia, and the Company plans to share initial clinical data in Q4 2025. In April 2025, the Company received approval from EMA to initiate a Phase 1 study in patients with active, difficult-to-treat rheumatoid arthritis. The Company expects to initiate the study at FAU Erlangen-Nuremberg in Germany and Università Cattolica del Sacro Cuore in Italy in Q2 2025. In April 2025, the Company announced plans to initiate a Phase 1 study in patients with active, moderate to severe Sjögren’s disease in the U.S. in Q2 2025. The global Phase 1 study in patients with moderate to severe SLE is ongoing in the United States, Europe, and Australia, and the Company plans to share initial clinical data in Q4 2025. In April 2025, the Company received approval from EMA to initiate a Phase 1 study in patients with active, difficult-to-treat rheumatoid arthritis. The Company expects to initiate the study at FAU Erlangen-Nuremberg in Germany and Università Cattolica del Sacro Cuore in Italy in Q2 2025. In April 2025, the Company announced plans to initiate a Phase 1 study in patients with active, moderate to severe Sjögren’s disease in the U.S. in Q2 2025. Oncology CLN-619 (Anti-MICA/MICB monoclonal antibody): NSCLC and multiple myeloma Following a review of the data from the disease-specific expansion cohorts for endometrial and cervical cancers, the Company has discontinued further development of CLN-619 in patients with gynecological cancers as preliminary results did not meet the internal threshold for advancement. Cullinan will continue enrolling to go/no-go decisions the ongoing expansion cohorts in patients with NSCLC and the ongoing Phase 1 study in patients with relapsed/refractory multiple myeloma. Zipalertinib (EGFR ex20ins inhibitor), collaboration with Taiho Oncology: EGFR ex20ins NSCLC In January 2025, Cullinan announced that the pivotal Phase 2b portion of REZILIENT1 met the primary endpoint of overall response rate in patients with EGFR ex20ins NSCLC who have received prior therapy. The results will be presented during an oral abstract session at the 2025 ASCO Annual Meeting on June 1, 2025. Pending discussions with the U.S. Food and Drug Administration, Taiho plans to submit an NDA in relapsed/refractory EGFR ex20ins NSCLC in the second half of 2025. Taiho continues enrollment of the pivotal study REZILIENT3 in 1L EGFR ex20ins NSCLC. CLN-049 (FLT3xCD3 T cell-engaging bispecific antibody): Acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS) Enrollment continues in the ongoing Phase 1 study in patients with relapsed/refractory AML or MDS, and in the ongoing Phase 1 study in patients with measurable minimal residual disease in AML. CLN-617 (IL-2 and IL-12 cytokine fusion protein): Solid tumors Enrollment continues in the ongoing Phase 1 study in patients with advanced solid tumors. Following a review of the data from the disease-specific expansion cohorts for endometrial and cervical cancers, the Company has discontinued further development of CLN-619 in patients with gynecological cancers as preliminary results did not meet the internal threshold for advancement. Cullinan will continue enrolling to go/no-go decisions the ongoing expansion cohorts in patients with NSCLC and the ongoing Phase 1 study in patients with relapsed/refractory multiple myeloma. In January 2025, Cullinan announced that the pivotal Phase 2b portion of REZILIENT1 met the primary endpoint of overall response rate in patients with EGFR ex20ins NSCLC who have received prior therapy. The results will be presented during an oral abstract session at the 2025 ASCO Annual Meeting on June 1, 2025. Pending discussions with the U.S. Food and Drug Administration, Taiho plans to submit an NDA in relapsed/refractory EGFR ex20ins NSCLC in the second half of 2025. Taiho continues enrollment of the pivotal study REZILIENT3 in 1L EGFR ex20ins NSCLC. Enrollment continues in the ongoing Phase 1 study in patients with relapsed/refractory AML or MDS, and in the ongoing Phase 1 study in patients with measurable minimal residual disease in AML. Enrollment continues in the ongoing Phase 1 study in patients with advanced solid tumors. First Quarter 2025 Financial Results Cash Position: Cash, cash equivalents, short- and long-term investments, and interest receivable were $567.4 million as of March 31, 2025. Cullinan continues to expect its cash resources to provide runway into 2028 based on its current operating plan. R&D Expenses: Research and development expenses were $41.5 million for the first quarter of 2025, compared to $30.6 million for the same period in 2024. G&A Expenses: General and administrative expenses were $13.5 million for the first quarter of 2025, compared to $12.3 million for the same period in 2024. Net Loss: Net loss attributable to Cullinan was $48.5 million for the first quarter of 2025, compared to $37.1 million for the same period in 2024. About Cullinan Therapeutics Cullinan Therapeutics, Inc. (Nasdaq: CGEM) is a biopharmaceutical company dedicated to creating new standards of care for patients. Cullinan has strategically built a diversified portfolio of clinical-stage assets that inhibit key drivers of disease or harness the immune system to eliminate diseased cells in both autoimmune diseases and cancer. Cullinan’s portfolio encompasses a wide range of modalities, each with the potential to be best and/or first in class. Anchored in a deep understanding of oncology, immunology, and translational medicine, we create differentiated ideas, identify the most appropriate targets, and select the optimal modality to develop transformative therapeutics across a wide variety of autoimmune and cancer indications. We push conventional boundaries from candidate selection to differentiated therapeutic, applying rigorous go/no go criteria at each stage of development to fast-track only the most promising molecules to the clinic and, ultimately, commercialization. With deep scientific expertise, our teams exercise creativity and urgency to deliver on our promise to bring new therapeutic solutions to patients. Learn more about Cullinan at https://cullinantherapeutics.com/, and follow us on LinkedIn and X. Forward-Looking Statements This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. These forward-looking statements include, but are not limited to, express or implied statements regarding the company’s beliefs and expectations regarding: our preclinical and clinical developments plans and timelines for our product candidates, the clinical and therapeutic potential of our product candidates, the strategy of our product candidates, our research and development activities, our plans regarding future data presentations, our cash runway, and other statements that are not historical facts. The words “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “plan,” “potential,” “project,” “pursue,” “will,” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this press release are based on management's current expectations and beliefs of future events and are subject to known and unknown risks and uncertainties that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. These risks include, but are not limited to, the following: uncertainty regarding the timing and results of regulatory submissions; the risk that any INDs, NDAs or other global regulatory submissions we may file with the United States Food and Drug Administration or other global regulatory agencies are not cleared on our expected timelines, or at all; the success of our clinical trials and preclinical studies; the risks related to our ability to protect and maintain our intellectual property position; the risks related to manufacturing, supply, and distribution of our product candidates; the risk that any one or more of our product candidates, including those that are co-developed, will not be successfully developed and commercialized; the risk that the results of preclinical studies or clinical studies will not be predictive of future results in connection with future studies; the effect of changes in global economic conditions, including uncertainties related to international trade policies, tariffs and supply chain dynamics on our business and operations; and the success of any collaboration, partnership, license or similar agreements. These and other important risks and uncertainties discussed in our filings with the Securities and Exchange Commission, including under the caption “Risk Factors” in our most recent Annual Report on Form 10-K and subsequent filings with the SEC, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change, except to the extent required by law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release. Moreover, except as required by law, neither the company nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements included in this press release. Any forward-looking statement included in this press release speaks only as of the date on which it was made. Contacts: Investors Nick Smith +1 401.241.3516 nsmith@cullinantx.com Media  Rose Weldon +1 215.801.7644 rweldon@cullinantx.com