FORTE BIOSCIENCES CLINICAL STAGE FB-102 3 FB102 CELIAC DISEASE PHASE 1B RESULTS JUNE 2025 1 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS 2 Certain statements contained in this presentation regarding matters that are not historical facts, are forward-looking statements within the meaning of Section 21E of the Securities and Exchange Act of 1934, as amended, and the Private Securities Litigation Act of 1995, known as the PSLRA. These include statements regarding management's intention, plans, beliefs, ...

Summary of the Conference Call on Cell Therapy and Autoimmune Diseases Industry Overview - The discussion focuses on the emerging field of cell therapy, particularly T cell engagers and CAR T therapies, and their applications in treating autoimmune diseases alongside oncology applications [1][2]. Key Companies and Their Innovations Cullinan - Cullinan is exploring T cell engagers to redirect T cells for depleting aberrant immune cells, particularly B cells, in autoimmune diseases [3]. - The company aims to make T cell redirecting therapies accessible in community-based centers, enhancing patient access [3]. Autolus - Autolus has launched a CD19 CAR T product approved for acute leukemia, demonstrating a strong safety profile and exceptional activity, leading to long-term remissions in advanced disease patients [4][5]. - The company is also looking to expand into the autoimmune space, believing that their product's features will be beneficial [6]. Caballetta - Caballetta focuses on developing cellular therapies specifically for autoimmune diseases, with their lead product ResiCel entering phase three trials for myositis [9][10]. - The company has agreements with the FDA for multiple cohorts in various trials, targeting diseases like lupus and multiple sclerosis [11]. Core Insights and Arguments - The panelists agree on the significant unmet need in autoimmune diseases and the potential for their therapies to provide meaningful clinical advances [8]. - T cell engagers have shown promise in achieving disease-modifying benefits, with reports indicating deep B cell depletion and symptom improvement in treated patients [14][15]. - The safety profile of these therapies is emphasized as a key differentiator in a market with high unmet needs [11][12]. Clinical Development and Regulatory Pathways - The discussion highlights the importance of understanding patient subtypes and tailoring treatment strategies based on disease severity and pathology [41]. - There is a consensus that the regulatory path for T cell engagers may differ from traditional drug approvals, with a focus on therapeutic benefit and safety [63][64]. Market Dynamics and Future Outlook - The panelists predict a competitive landscape in the autoimmune therapy market, with multiple modalities coexisting rather than competing fiercely [13]. - The potential for bispecific therapies to transform treatment paradigms is acknowledged, with expectations for improved efficacy and safety profiles [32][38]. - The market for autoimmune therapies is seen as distinct from oncology, with different pricing and patient demographics influencing market strategies [30][31]. Additional Considerations - The importance of biomarkers in identifying suitable patients for different therapies is highlighted, with ongoing research expected to refine patient selection [25][41]. - The need for collaboration between hematologists and rheumatologists is emphasized to facilitate patient enrollment in clinical trials [58][61]. This summary encapsulates the key points discussed during the conference call, providing insights into the current state and future potential of cell therapies in treating autoimmune diseases.

Financial Data and Key Metrics Changes - The company ended Q1 2025 with $220.7 million in cash and investments, with no debt on the balance sheet, and expects a cash runway extending into Q4 2026 [27] - Q1 2025 revenue was $10.5 million, primarily from non-cash royalty revenue, with expectations to maintain similar revenue levels for the remainder of 2025, totaling approximately $40 million for the full year [27][28] - R&D expenses for Q1 2025 were $30.5 million, with full-year expectations ranging between $110 million and $120 million [28] - The net loss for Q1 was $50.9 million, equating to a net loss per share of $0.24 [31] Business Line Data and Key Metrics Changes - The company is focusing on the development of its immunology pipeline, particularly the advancement of Respag in three Phase II studies [6][10] - The Respag Phase 2b study for atopic dermatitis has enrolled approximately 400 biologic-naive patients, with results expected in June 2025 [14][20] - The company anticipates reporting top-line results for the Respag AA Phase IIb study in alopecia areata in December 2025 [10][21] Market Data and Key Metrics Changes - There are approximately 30 million adult patients with atopic dermatitis in the US, with about half having moderate to severe disease [9] - The company notes that only about 8% of patients with moderate to severe atopic dermatitis are currently treated with biologics, indicating a significant unmet need in the market [10] Company Strategy and Development Direction - The company aims to establish Respag as a first-in-class T regulatory cell therapy to address various immune disorders, differentiating it from existing treatments [6][10] - The strategy includes advancing multiple drug candidates through clinical trials while maintaining a strong financial position to support these initiatives [13][27] - The company plans to explore partnerships for the Phase III program of Respag, given its current financial position [57] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in the potential of Respag to address high unmet needs in chronic conditions like atopic dermatitis and alopecia areata [6][10] - The company is optimistic about the upcoming data readouts and their implications for future clinical development [27][90] Other Important Information - The company has implemented measures to control placebo response rates in clinical trials by enrolling a lower percentage of patients from the US and using experienced dermatologists [19][37] - The company recorded a non-cash loss from equity method investment of $4.5 million in Q1 2025, with expectations of a total loss of approximately $10 million for the full year [30] Q&A Session Summary Question: What does the company hope to see in RESOLVE AD to move forward into Phase III? - The company aims to replicate Phase I data and compare results against Dupixent as a benchmark for efficacy [35] Question: What are the expectations for the placebo response in RESOLVE AD? - The company anticipates a lower placebo response than the 47% observed in Phase I, due to proactive measures taken in the study design [37] Question: How many patients have progressed to the maintenance portion of the trial? - The company cannot disclose specific numbers at this time but will provide details in the upcoming top-line results [40] Question: What is the dropout rate for the Phase 1b atopic dermatitis trial? - The dropout rate was approximately 30% for placebo and in the low to mid-20s for Respag arms, with similar reporting expected for the Phase II results [50][51] Question: Will the company pursue an end of Phase II meeting with the FDA after the 36-week AD data? - The company plans to initiate discussions with the FDA based on the 16-week induction data, without waiting for the completion of the maintenance phase [88]

Core Insights - Cartesian Therapeutics announced positive 12-month efficacy and safety data from the Phase 2b trial of Descartes-08 for generalized myasthenia gravis (MG), showing sustained symptom improvement in participants [2][4][9] - Descartes-08 demonstrated a significant average reduction in MG-ADL scores, particularly in patients without prior biologic therapy, indicating its potential as a transformative treatment option [9][11] Efficacy Results - Participants treated with Descartes-08 experienced an average MG-ADL reduction of 4.8 points at Month 12, with deeper responses observed over time [7][11] - In the subgroup of participants without prior biologic therapy, the average MG-ADL reduction was 7.1 points at Month 12, with 57% maintaining minimum symptom expression [11] - 83% of evaluable participants maintained a clinically meaningful response through Month 12, defined as a reduction of at least 2 points in MG-ADL [7] Safety Profile - The safety profile of Descartes-08 was consistent with previously reported data, supporting its outpatient administration without the need for preconditioning chemotherapy [4][10] - Adverse events were mostly mild and transient, with no new adverse events reported during the 12-month follow-up [10][11] Future Development - The Phase 3 AURORA trial is on track to dose the first patient in the second quarter of 2025, with the trial design accepted by the FDA under the Special Protocol Assessment process [9][14] - Descartes-08 has received Regenerative Medicine Advanced Therapy and Orphan Drug Designations from the FDA, highlighting its potential in treating MG [9][13]

Core Insights - Cartesian Therapeutics announced positive 12-month efficacy and safety data from the Phase 2b trial of Descartes-08 for generalized myasthenia gravis (MG) [2][4] - Descartes-08 demonstrated sustained symptom improvement with an average reduction of 4.8 points in MG Activities of Daily Living (MG-ADL) at Month 12 [6][8] - The therapy showed particularly strong results in participants without prior exposure to biologic therapies, achieving an average 7.1-point reduction in MG-ADL [10] Efficacy Results - In the Phase 2b trial, participants receiving Descartes-08 experienced deep responses, with an average MG-ADL reduction of 5.5 at Month 4 and 4.8 at Month 12 [6][4] - 83% of evaluable participants maintained a clinically meaningful response through Month 12, defined as a reduction of at least 2 points in MG-ADL [6] - Among participants without prior biologic therapy, 100% maintained a clinically meaningful response through Month 12 [10] Safety Profile - Descartes-08 was well-tolerated, with no new adverse events reported during the 12-month follow-up [10] - Common side effects included transient infusion-related reactions such as fever (60%), chills (60%), headache (55%), and nausea (45%), all resolving within 24 hours [10] - No cases of cytokine release syndrome (CRS) or immune effector cell-associated neurotoxicity syndrome (ICANS) were reported [10] Future Developments - The Phase 3 AURORA trial is set to dose the first patient in the second quarter of 2025, following FDA agreement on the trial design [8][10] - Descartes-08 has received Regenerative Medicine Advanced Therapy (RMAT) and Orphan Drug Designations from the FDA for the treatment of MG [12][8] - The company aims to transform the treatment landscape for MG with Descartes-08, offering a safe and durable outpatient therapy option [8][10]

Financial Data and Key Metrics Changes - For Q4 2024, total revenue was $59.9 million, up 33% from $45.1 million in Q4 2023 [8][16] - For the full year 2024, total revenue was $235.1 million, up 34% from $175.5 million in 2023 [8][16] - Net product sales of LUPKYNIS for Q4 2024 were $57.6 million, up 36% from $42.3 million in Q4 2023 [9] - For the full year 2024, net product sales were $216.2 million, up 36% from $158.5 million in 2023 [9] - Cash flow from operations for Q4 2024 was $30.1 million, compared to $14.3 million in Q4 2023 [10] - Cash flow from operations for the full year 2024 was $44.4 million, compared to cash flow used in operations of $33.5 million in 2023 [10] - As of December 31, 2024, cash, cash equivalents, restricted cash, and investments totaled $358.5 million [11][17] - Gross margin for Q4 2024 was 91%, compared to 88% in Q4 2023; for the full year 2024, gross margin was 88%, down from 92% in 2023 [20] Business Line Data and Key Metrics Changes - The increase in net product sales of LUPKYNIS was primarily due to an increase in the number of cartons sold to specialty pharmacies [9] - Cost of revenue for Q4 2024 was $5.6 million, compared to $5.4 million in Q4 2023; for the full year 2024, cost of revenue was $28.2 million, up from $14.1 million in 2023 [19] Company Strategy and Development Direction - The company has a commercial strategy focused on four key growth drivers: expanding business at academic medical centers, targeting key rheumatology prescriber segments, leveraging new ACR lupus nephritis treatment guidelines, and improving continuity of care for lupus nephritis patients [12][13] - The company expects total revenue for 2025 to be in the range of $250 million to $260 million and net product sales in the range of $240 million to $250 million [14] Management Comments on Operating Environment and Future Outlook - Management expressed confidence in the growth of LUPKYNIS, citing a strong sales growth of 36% in 2024 and a solid position to start 2025 [12][14] - Management noted that historical financial results provide sufficient insight into the health of the business for projecting future results [11][58] Other Important Information - The company initiated a Phase 1 study for AUR200 in September 2024, with initial results expected in Q2 2025 [14][15] - The company has repurchased approximately 9.7 million common shares for about $70 million since the launch of the share repurchase program in Q1 2024 [18] Q&A Session Summary Question: Details on maximizing LUPKYNIS opportunity with current sales force - Management highlighted a focus on high prescribing rheumatology offices and the importance of the new ACR guidelines for early diagnosis and treatment [25][30] Question: Expectations for AUR200 data in Q2 - Management indicated that normal pharmacodynamics and pharmacokinetic data are expected, which will inform the next steps in the study [26][32] Question: Growth expectations for LUPKYNIS beyond 2025 - Management refrained from providing long-term guidance but emphasized historical trends as a basis for future projections [36][38] Question: Initial two months of 2025 and commercial outlook - Management stated that the guidance range is based on current market observations and historical financial results [46][49] Question: Decision to stop reporting PSS metrics - Management explained that after five years on the market, historical results provide sufficient insight for future projections [54][58] Question: Impact of ACR treatment guidelines on prescriber behavior - Management noted that over 50% of prescriptions come from rheumatologists, with expectations for gradual improvement in treatment behaviors [65][70] Question: Timeline for AUR200 studies - Management indicated that timelines will be clearer after the completion of the single-ascending dose study [66][72]