Casdatifan (HIF-2α) Program - Casdatifan 100mg QD tablet showed a 33% confirmed ORR (Overall Response Rate) with short follow-up[15,19] - Casdatifan 100mg QD tablet showed a 15% primary progressive disease (PD) rate[15] - Casdatifan 50mg BID cohort showed a median Progression Free Survival (mPFS) of 9.7 months[15,25] - Casdatifan 50mg QD cohort showed mPFS not reached with 12 months follow-up[15,25] - The PEAK-1 Phase 3 study for Casdatifan is on track to initiate in Q2 2025[33] Domvanalimab (Anti-TIGIT mAb) Program - Domvanalimab plus Zimberelimab in 1L Gastric Cancer showed ~13 months mPFS vs 7-8 months for benchmark data[11] - In 1L PD-L1 High NSCLC, Domvanalimab + Zimberelimab vs Zimberelimab showed OS Hazard Ratio of 0.64[11,58] - EDGE-Gastric data showed 13.8 months median PFS in TAP ≥5% and 11.3 months median PFS in TAP < 5%[47] - STAR-221 is a Phase 3 study evaluating Domvanalimab + Zimberelimab + Chemo in 1L Gastric/GEJ/EAC, with data expected in 2026[51,52] CD73-Adenosine Axis Programs - Quemli ± Zim + G/nP in 1L Metastatic PDAC showed 15.7 months mOS vs 9.8 months for Synthetic Control Arm, representing a 37% reduction in risk of death[70]

Casdatifan (Cas) & Cabozantinib (Cabo) Combination Therapy - The combination of Cas and Cabo shows a confirmed Overall Response Rate (ORR) of 46% in patients eligible for a minimum of 12 weeks follow-up [32] - In the Cas + Cabo cohort, 98% of patients experienced any treatment-related Adverse Events (AEs) [46] - The median duration of follow-up for patients on Cas 100mg QD + Cabo 60mg QD was 37 months [43] Casdatifan Development and Market Opportunity - Arcus Biosciences has $1 billion in cash to fund pivotal readouts for Domvanalimab (dom), Quemliclustat (quemli), and Casdatifan (cas), including the PEAK-1 trial [12] - Belzutifan prescriptions have grown 154% from December 2023 to April 2025 [74] - Belzutifan achieved LTM sales of >$560 million in the US, with run rate sales based on April Rx's at $720 million+ [75] Clinical Trial and Future Development - PEAK-1, a Phase 3 study, is expected to initiate imminently for post-IO ccRCC, randomizing patients to either 100mg Casdatifan + Cabozantinib or Placebo + Cabozantinib in a 2:1 ratio with approximately 700 patients [67, 68] - Arcus is targeting a $3 billion market opportunity in IO-naive metastatic ccRCC with Casdatifan + Volrustomig (volru) [85] - Arcus is also targeting a $2 billion market in post-IO metastatic ccRCC with Casdatifan + Cabozantinib [85]