autograft
noun [ C ] medical specialized uk/ˈɔː.təʊ.ɡrɑːft/ us/ˈɔː.t̬əˌɡræft/
自体移植物（从自体移植的组织或器官）
a tissue or an organ that has been cut from one part of a person's body and attached to another part of their body
Since an autograft is used, no immunosuppression is necessary. 既然用的是自体移植物，就没有必要进行免疫抑制了。