Business Overview - Scholar Rock's strategy focuses on selectivity in targeting latent growth factors to develop therapeutics across multiple disease areas[12, 15, 17, 19] - The company is advancing a pipeline of product candidates in neuromuscular disorders, cardiometabolic disorders, immuno-oncology, fibrosis, and anemia[20, 23] - Scholar Rock anticipates transformative execution in the next 12-24 months, driven by upcoming milestones and commercialization efforts[12] Apitegromab (Spinal Muscular Atrophy) - Topline readout from the Phase 3 SAPPHIRE trial in SMA is expected in Q4 2024, with a potential SMA launch in Q4 2025 if successful and approved[30] - 48-month data from the TOPAZ clinical trial showed substantial and sustained improvements in motor function outcomes in pooled nonambulatory SMA patients[39, 46, 52] - In the TOPAZ trial, pooled nonambulatory patients showed mean change from baseline in HFMSE of 2.8 at 6 months, 3.6 at 12 months, 4.2 at 24 months, 4.0 at 36 months, and 5.3 at 48 months[40] - In the TOPAZ trial, pooled nonambulatory patients showed mean change from baseline in RULM of 0.6 at 6 months, 1.3 at 12 months, 2.3 at 24 months, 2.4 at 36 months, and 3.6 at 48 months[47] Apitegromab (Obesity) & SRK-439 - A Phase 2 proof-of-concept EMBRAZE study of apitegromab in obesity is enrolling, with topline data expected in Q2 2025[23, 30, 60, 63] - SRK-439, a novel anti-myostatin antibody, is being advanced to IND submission, with preclinical data showing potential for healthier weight loss in combination with GLP-1 receptor agonists[23, 30, 75] - Preclinical data showed that SRK-439 increased lean mass and attenuated regain of fat mass after GLP-1 RA withdrawal in an obesity mouse model[78] - In preclinical studies, SRK-439 demonstrated greater potency than an anti-ActRII antibody at maintaining lean mass during GLP-1 RA-induced weight loss[77, 88]