SGR-1505 Development & Rationale - Schrödinger's computational platform aims to improve drug discovery success rates by accurately calculating molecular properties [8, 10] - MALT1 is identified as a key regulator of NF-κB signaling in B-cells and T-cells, making it a potential target for B-cell malignancies where BTK inhibitor resistance develops [18] - The company rapidly designed SGR-1505, a best-in-class MALT1 inhibitor, by modeling 8.2 billion compounds and synthesizing 78 in the SGR-1505 series within 10 months [21] Phase 1 Clinical Trial Results - The Phase 1 study of SGR-1505 showed a favorable safety profile and was well-tolerated in patients with relapsed/refractory B-cell neoplasms [36, 42] - Approximately 43% of patients experienced treatment-related adverse events (TRAEs), and there were no dose-limiting toxicities or deaths due to treatment-emergent adverse events (TEAEs) [44] - SGR-1505 demonstrated strong target engagement, with ~90% inhibition of IL-2 in the majority of PD-evaluable patients treated at ≥150 mg QD and all Q12H doses at steady state [47] - Encouraging preliminary efficacy was observed across a range of B-cell malignancies, including monotherapy signals in CLL and Waldenström macroglobulinemia (WM) [36, 49] Market Opportunity & Future Steps - There is a potential MALT1 opportunity in higher-risk CLL patients, as well as in relapsed/refractory lymphoma where resistance to BTK agents has emerged [29, 60, 67] - The company plans to discuss the recommended Phase 2 dose with the FDA later this year [57] - Preclinical data suggests that combining SGR-1505 with BTK and/or BCL-2 inhibitors may lead to deeper anti-tumor activity [66] - Ibrutinib, a BTK inhibitor, has achieved $10.9 billion in sales, indicating a significant market for B-cell malignancy treatments [68]