Brennan's body changed blood group from o negative to o positive when she became ill while on drugs to avoid rejection of the organ by her body's immune system.

布伦南生病期间需服药来避免身体免疫系统对移植器官的排斥，其间她的O型血从阴性转为阳性。

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The cases whose MRD was persistently positive or changed from negative to positive during CR had a higher relative risk for relapse (P< 0.05 ).

缓解期MRD持续阳性或由阴性转为阳性者，骨髓复发的相对危险度明显增高（P< 0 .0 5 ）。

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The cases whose MRD was persistently positive or changed from negative to positive during CR had a higher relative risk for relapse (P< 0.05 ).

缓解期MRD持续阳性或由阴性转为阳性者，骨髓复发的相对危险度明显增高（P< 0 .0 5 ）。

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