1The doctor told her that the tumour was malignant and needed to be removed immediately.
2Malignant melanoma is a type of skin cancer that can spread quickly if not treated.
3The patient's malignant condition made it difficult for her to recover from the surgery.
4Researchers are working to develop new treatments for malignant diseases such as cancer and HIV.
5The malignant cells in the patient's body were multiplying rapidly, making it a challenging case to treat.