Core Points - The article highlights the story of a man, Mr. Zhang, who became a hematopoietic stem cell donor after his daughter was successfully treated for leukemia, emphasizing the importance of such donations in saving lives [1][2]. Group 1: Background and Personal Story - Mr. Zhang's daughter was diagnosed with a rare form of leukemia at the age of one, leading the family to seek treatment across the country [1]. - During his daughter's hospitalization, Mr. Zhang contributed a blood sample to the China Marrow Donor Program, understanding the significance of stem cell donation for patients in need [1][2]. Group 2: Donation Process and Impact - After eight years, Mr. Zhang was contacted for a potential match with another blood disease patient, and he agreed to proceed with further testing, recognizing the urgency of the situation for the patient [2]. - Mr. Zhang has been a dedicated blood donor since 2009, having donated over 20,000 milliliters of blood across more than 70 donations, earning national recognition for his contributions [2]. Group 3: Community and Future Aspirations - Following his donation, Mr. Zhang expressed hope that his story would inspire more individuals to participate in charitable activities and help others [4]. - The Chongqing Red Cross Society reported that this donation marked the 296th case of hematopoietic stem cell donation in the city, with a total of 9 donations completed in 2025 [4].