Tempest And Senlang To Collaborate To Develop Tempest’s Proprietary TPST-4003 Product Candidate, Beginning With IIT In China Evaluating TPST-4003 In ~10 Patients With MG Or MS; Expects First Patient Enrollment And Dosing To Occur In Q4 Of 2026

• Tempest’s TPST-4003 is a next-generation in vivo CAR-T candidate combining proprietary CD7-targeted mRNA/LNP delivery with a dual-target CD19/BCMA CAR construct designed to enable broad B-cell lineage depletion and immune reset for autoimmune and oncology indications
• Senlang Biotechnology, a clinical-stage cell therapy company with established expertise in CD7-targeted CAR-T development, will conduct a first-in-human investigator-initiated trial of TPST-4003 in approximately 10 patients with neurological autoimmune diseases, initially including myasthenia gravis and multiple sclerosis, with first patient dosing expected in the fourth quarter of 2026

BRISBANE, Calif., July 21, 2026 (GLOBE NEWSWIRE) -- Tempest Therapeutics, Inc. (NASDAQ:TPST) ("Tempest"), a clinical-stage biotechnology company developing a pipeline of advanced chimeric antigen receptor T-cell ("CAR-T") product candidates, today announced a strategic partnership with Hebei Senlang Biotechnology Co., Ltd. ("Senlang"), a clinical-stage cell therapy company with extensive expertise in CD7-targeted CAR-T development and clinical translation. Under the agreement, Tempest and Senlang will collaborate to develop Tempest’s proprietary TPST-4003 product candidate, beginning with an investigator-initiated trial ("IIT") in China evaluating TPST-4003 in approximately 10 patients with myasthenia gravis ("MG") or multiple sclerosis ("MS"). The company expects first patient enrollment and dosing to occur in the fourth quarter of 2026.

The initial study is designed to generate clinical evidence of safety, pharmacodynamic ("PD") activity, and therapeutic potential of TPST-4003, building on promising findings from related pipeline preclinical and clinical research. Under the agreement, Senlang will coordinate and support trial execution in China, leveraging its extensive experience in clinical development of advanced CAR-T therapies. Additionally, the agreement grants Senlang an exclusive option to negotiate and enter into a definitive license agreement for TPST-4003 in China.