The Stock Exchange of Hong Kong Limited and the Securities and Futures Commission take no responsibility for the contents of this Application Proof, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this Application Proof. Application Proof of Simcere Zaiming Pharmaceutical Co., Ltd. 先聲再明醫藥股份有限公司 (A joint stock company with limited liability incorporated in ...

Core Viewpoint - NextCure, Inc. and Simcere Zaiming have formed a strategic partnership to develop SIM0505, a novel antibody-drug conjugate targeting CDH6 for solid tumors, with clinical testing expected to begin in the U.S. in Q3 2025 [1][3]. Group 1: Partnership Details - The partnership allows NextCure to access Simcere Zaiming's proprietary linker and TOPOi payload for a preclinical-stage ADC developed by NextCure, while Simcere Zaiming retains Greater China rights to this ADC [4][7]. - Simcere Zaiming is eligible for payments up to $745 million throughout the development phases, including upfront payments and tiered royalties on net sales outside Greater China [5][7]. Group 2: Product Development - SIM0505 is currently undergoing Phase 1 dose escalation studies in China, with a global dose expansion study planned to include multiple tumor types [3][7]. - Preclinical studies of SIM0505 have shown robust anti-tumor activity and a promising safety profile [2][5]. Group 3: Company Background - NextCure is focused on developing innovative therapies for cancer patients who do not respond to existing treatments, utilizing differentiated mechanisms such as antibody-drug conjugates [6]. - Simcere Zaiming, a subsidiary of Simcere Pharmaceutical Group, aims to develop groundbreaking therapies for cancer patients globally, leveraging its R&D and commercialization capabilities [8].