Effects of Hydroxyapatite Supermicromist on DNA Content and Cell Cycle of W-256 Sarcoma Cell Xia Qinghua; （ Union Hospital of Tongji Medical University, Wuhan 430022, China.） Chen Daoda; Lin Hua; Yan Yuhua; Feng Lingyun; Li Shipu We analysed the effects of hydroxyapatite supermicromist on DNA content and cell cycle of W-256 sarcoma cell by the method of flow cytometry. The results showed that hydroxyapatite supermicromist inhibited DNA synthesis of W-256 sarcoma cell and made cell proliferation obstracted in cell cycle of G2 phase. hydroxyapatite supermicromist; DNA content; cell cycle; tumor cell