Summary of Climb Bio's Conference Call Company Overview - **Company**: Climb Bio - **Focus**: Autoimmune diseases with two antibodies in clinical development Key Points Upcoming Milestones - Climb Bio has five clinical data readouts scheduled for this year - Monoclonal antibody targeting CD19: - Data on subcutaneous (subQ) formulation in healthy volunteers expected in the first half of the year - Initial data from Phase 1b studies in Immune Thrombocytopenic Purpura (ITP) and Systemic Lupus Erythematosus (SLE) in the second half - Initial data from Phase 2 study in Primary Membranous Nephropathy (PMN) also expected in the second half - Second antibody, an APRIL-only antibody for IgA nephropathy, will have data available mid-year [2][3][4] Competitive Landscape - UPLIZNA is currently the only approved CD19 antibody, focusing on rare neuro diseases - Climb Bio's CD19 antibody is believed to have greater affinity and a subQ formulation option, which UPLIZNA lacks [5][7][11] PMN Indication - No approved therapies currently exist for PMN; standard care includes off-label use of rituximab - Rituximab achieves complete renal remission in only 10% of patients after one year and 35% after two years - Climb Bio's Phase 1b study showed a 60% complete remission rate and 100% serological remission in PLA2R antibody-positive patients [14][15][32] Market Opportunity - Approximately 70,000 patients in the U.S. have PMN, with two-thirds requiring therapeutic intervention - Regulatory strategy involves one Phase 3 study with around 150 patients, focusing on proteinuria as the primary endpoint [32][34] ITP and SLE Indications - ITP has a strong rationale for CD19 targeting, with only 20% of refractory patients achieving a durable platelet response - SLE is viewed as a more complex indication, requiring larger pivotal trials; Climb Bio is conducting a parallel study in China for lupus nephritis patients [39][40][41] APRIL Antibody Development - Climb Bio's APRIL-only antibody (CLYM116) features a unique sweeper mechanism, allowing for high-affinity binding and potential for longer half-life - Early studies indicate a two- to threefold longer half-life compared to existing therapies, with better activity in IgA suppression [48][56][60] Financial Position - Climb Bio reported $176 million in cash at the end of Q3, with a runway extending into 2028, covering all planned readouts for the year [93][95] Future Indications - Climb Bio is exploring additional indications for the APRIL antibody, including Sjögren's syndrome, to maximize asset potential [90][91] Conclusion - Climb Bio is positioned to address significant unmet needs in autoimmune diseases with promising clinical data and a strong financial foundation, paving the way for potential market success in the coming years [2][93][95]