malignization

例句：

1. 1. The cancer cells are undergoing a malignant transformation.
   癌细胞正在经历恶性转化。
2. 2. The study found that the malignant transformation of the tumor could be prevented by certain treatments.
   研究发现，某些治疗可以预防肿瘤的恶性转化。
3. 3. Malignant transformation is a common cause of cancer.
   恶性转化是癌症的常见原因。