Immatics (IMTX) Earnings Call Presentation

PRAME Franchise & Market Opportunity - Immatics is developing three clinical product candidates (IMA402, IMA203, IMA203CD8) precisely targeting PRAME, an intracellular protein presented on tumor cell surfaces[10, 12] - PRAME expression is prevalent in over 50 cancers[8], with prevalence ranging from 20% in Hepatocellular Carcinoma and Bladder Carcinoma to 95% in Cutaneous Melanoma, Uterine Carcinoma, and Synovial Sarcoma[9] - The addressable PRAME+/HLA-A02:01+ patient population in the US & EU5 is estimated to be approximately 230,000 per year[20, 24] IMA203 PRAME Cell Therapy (Wave 1) - In a Phase 1 study, IMA203 demonstrated a confirmed objective response rate (cORR) of 56% (18/32) in heavily pretreated patients with metastatic melanoma[34, 45] - The median duration of response (mDOR) was 121 months, with ongoing responses for up to 25+ years[34] - The median progression-free survival (mPFS) was 61 months, and the median overall survival (mOS) was 159 months in all melanoma patients[34, 51] - The SUPRAME Phase 3 trial is actively enrolling patients with unresectable or metastatic melanoma post-ICI, with a planned launch in Q3 2027[35, 59] - Approximately 9,000 PRAME+/HLA-A02:01+ patients in the US/EU5 with cutaneous and uveal melanoma are addressable[34] IMA203CD8 PRAME Cell Therapy (GEN2) (Wave 2) - IMA203CD8 is a next-generation PRAME cell therapy leveraging CD8 and CD4 T cells, with enhanced pharmacology[24] - In a Phase 1a dose escalation study, IMA203CD8 achieved a cORR of 41% (14/34) at presumably suboptimal doses, with 84% (32/38) of patients experiencing tumor shrinkage[73, 85] - The median duration of response (mDOR) was 92 months, with 3 confirmed responses ongoing at 1+ year[73, 85] - The addressable PRAME+/HLA-A02:01+ patient opportunity for IMA203CD8 is approximately 75,000 per year, including indications with both high and medium-level PRAME expression[20, 68] IMA402 PRAME Bispecific (Wave 3) - IMA402 is a next-generation half-life extended bispecific primarily targeting first-line settings in combination with ICI and targeted agents[22] - Early signs of clinical activity have been observed, with a melanoma patient achieving a confirmed partial response ongoing at 3 months at DL7[115] - The addressable PRAME+/HLA-A02:01+ patient population for IMA402 in 1L solid tumors is approximately 145,000 in the US & EU5[20, 100] Beyond PRAME: IMA401 MAGEA4/8 Bispecific - IMA401 is a bispecific targeting MAGEA4/8, with a Phase 1a study demonstrating a 29% (5/17) ORR and 25% (4/16) cORR in patients with MAGEA4/8high expression at relevant doses[132, 149] - The addressable MAGEA4/8+ and HLA-A*02:01+ patient population in the US & EU5 is approximately 62,000 per year[128, 130]