Immatics Reports Interim Clinical Data from Ongoing Phase 1b Cohort A Monotherapy with ACTengine® IMA203 TCR-T Targeting PRAME

Immatics N.V. (“Immatics”), a clinical-stage biopharmaceutical company active in the discovery and development of T cell-redirecting cancer immunotherapies, today announced an interim clinical data update for 11 patients with recurrent and/or refractory solid cancers treated with ACTengine® IMA203 TCR-T monotherapy in the ongoing Phase 1b dose expansion Cohort A. IMA203 TCR-T cells are directed against an HLA-A*02-presented peptide derived from PRAME, a broadly expressed solid cancer target with clinical proof-of-concept for IMA203 demonstrated by Immatics in 2022. Overall, IMA203 showed a high rate of deep and durable objective responses, with a confirmed objective response rate of 67% (6/9), across multiple tumor types, including two confirmed partial responses (cPR) ongoing at more than 9 months after treatment and three additional partial responses ongoing at data cut-off. IMA203 monotherapy continues to be well tolerated in heavily pre-treated patients at doses of up to approximately 9 billion CD8+ TCR-T cells. No high-grade cytokine release syndrome (CRS) and no immune effector cell associated neurotoxicity syndrome (ICANS) were observed in Cohort A at data cut-off.

Immatics Announces Third Quarter 2022 Financial Results and Business Update

• Interim clinical update on ACTengine® IMA203 TCR-T monotherapy targeting PRAME demonstrated high confirmed objective response rate (cORR) of 50% (6/12) at or above target dose across Phase 1a and Phase 1b; confirmed responses seen across different solid tumor types: cutaneous melanoma, ovarian cancer, head and neck cancer, uveal melanoma, and synovial sarcoma
• First patient treated with IMA203CD8, a 2nd generation ACTengine® TCR-T monotherapy product candidate targeting PRAME in Phase 1b expansion cohort C; patient treatment ongoing in all three Phase 1b expansion cohorts
• Next-generation TCR Bispecific, TCER® IMA402 targeting PRAME showed high anti-tumor activity in vivo, low T cell engager-associated toxicities and favorable pharmacodynamic characteristics in preclinical studies; Phase 1/2 clinical trial on track to start in 2023
• Joint publication with University of Pennsylvania in Science Translational Medicine on Immatics’ novel proprietary target COL6A3 exon 6
• $110 million underwritten offering of 10,905,000 ordinary shares successfully completed on Oct 12, 2022
• Cash and cash equivalents as well as other financial assets of $301.5 million1 (€309.3 million) as of September 30, 2022. Additional cash from the recent public offering in October 2022 funds company operations into 2025

Immatics N.V. (“Immatics”), a clinical-stage biopharmaceutical company active in the discovery and development of T cell-redirecting cancer immunotherapies, today provided a business update and reported financial results for the quarter ended September 30, 2022.

Immatics Reports Interim Clinical Data Update on ACTengine® IMA203 TCR-T Monotherapy Targeting PRAME

Immatics N.V. (“Immatics”), a clinical-stage biopharmaceutical company active in the discovery and development of T cell-redirecting cancer immunotherapies, today announced a clinical data update for the IMA203 monotherapy covering the completed Phase 1a dose escalation part of the trial and initial data from the first 5 patients in the ongoing Phase 1b dose expansion cohort A (monotherapy). In the Phase 1 trial with ACTengine® IMA203, Immatics is treating recurrent and/or refractory solid cancer patients utilizing TCR-T cells directed against an HLA-A*02-presented peptide derived from PRAME, which is frequently expressed across several solid cancer indications. Overall, IMA203 continues to be well tolerated and achieved confirmed objective responses across multiple solid cancers such as cutaneous melanoma, ovarian cancer, head and neck cancer, uveal melanoma, and synovial sarcoma. Encouraging early signs of improved durability were seen with a 50% (6/12) confirmed objective response rate, when patients were infused at the target dose or above with more than 1 billion TCR-T cells.

Immatics Announces First Cancer Patient Treated with Second-Generation ACTengine® TCR-T Candidate IMA203CD8 Targeting PRAME

• IMA203CD8 is a 2nd-generation product candidate co-expressing Immatics’ proprietary CD8αβ co-receptor engaging functional CD4 and CD8 T cells directed against PRAME
• Preclinical data with IMA203CD8 showed enhanced potency and prolonged anti-tumor activity mediated by activated TCR-engineered CD4 T cells
• The IMA203CD8 Phase 1b expansion study is the third cohort of Immatics’ multi-cohort strategy to achieve durable high response rates with TCR-T cells targeting PRAME-positive, hard-to-treat solid tumors
• First three patients to be treated at dose level 3 with the intention to advance directly to the recommended Phase 2 dose

Immatics N.V. (“Immatics”), a clinical-stage biopharmaceutical company active in the discovery and development of T cell-redirecting cancer immunotherapies, today announced the treatment of the first patient in its Phase 1b expansion cohort C (NCT03686124) evaluating IMA203CD8, the company’s 2nd generation TCR-T monotherapy approach where a proprietary CD8αβ co-receptor is added to PRAME-specific IMA203 T cells. The CD8 co-receptor plays an important role during T cell antigen recognition and T cell activation, enabling the effective engagement of CD8 and CD4 T cells in the anti-tumor response. The 2nd generation TCR-T IMA203CD8 aims to further enhance depth and durability of anti-tumor responses and clinical outcomes of TCR-T targeting PRAME in patients with solid cancers. PRAME is highly prevalent across several indications thereby supporting the program’s potential to reach a broad patient population.

Immatics and Editas Medicine Enter Strategic Research Collaboration and Licensing Agreement to Combine Gamma-Delta T Cell Adoptive Cell Therapies and Gene Editing for the Treatment of Cancer

Immatics N.V. (“Immatics”), a clinical-stage biopharmaceutical company active in the discovery and development of T cell-redirecting cancer immunotherapies, and Editas Medicine, Inc. (Nasdaq: EDIT), a leading genome editing company, today announced that the two companies have entered into a strategic research collaboration and licensing agreement to combine gamma-delta T cell adoptive cell therapies and gene editing to develop medicines for the treatment of cancer. As part of the licensing agreement, Immatics gains non-exclusive rights to Editas Medicine’s CRISPR technology and intellectual property. Editas Medicine is the exclusive licensee of Harvard and Broad Institute’s Cas9 patent estates and Broad Institute’s Cas12a patent estate for human medicines.