Zhi Tong Cai Jing·2025-09-29 03:11Core Viewpoint - Rongchang Biologics (09995) saw a stock increase of over 7%, currently at 109.4 HKD, with a trading volume of 357 million HKD, following the announcement of its drug Taitasip being prioritized for review for treating adult patients with primary immunoglobulin A (IgA) nephropathy [1] Group 1: Drug Development and Clinical Trials - On September 28, the CDE website indicated that Taitasip is proposed for inclusion in the priority review category for treating adult patients with IgA nephropathy at risk of progression, significantly reducing proteinuria levels [1] - On August 27, Rongchang Biologics announced that the Phase III study of Taitasip for treating IgA nephropathy achieved its primary endpoint in Stage A, showing a 55% reduction in the 24-hour urine protein-to-creatinine ratio (UPCR) compared to the placebo group after 39 weeks of treatment [1] Group 2: Mechanism of Action - Taitasip is currently the only drug that can simultaneously inhibit B lymphocyte stimulator (BLyS) and proliferation-inducing ligand (APRIL), both of which are significantly elevated in IgA nephropathy patients compared to the normal population, serving as key drivers of the disease [1] - By inhibiting these two factors, Taitasip can reduce B cell proliferation, lower plasma cell counts, and decrease the generation of abnormal immunoglobulins, thereby blocking the deposition of immune complexes at the source and alleviating renal immune inflammatory responses [1]