Malignant does mean death in most cases.
In medical terms the word malignant means tending to produce death or deterioration.
The word malignant is used to describe serious conditions which are likely to cause death if left untreated.
In some cases malignant diseases and malignant cancers can be cured if treated soon enough although it can still cause death.
Malignant tumors are cancerous tumors that are also invasive or metastatic and they grow faster than normal tissues and can even invade and damage your healthy cells.
Malignant can also be used to describe other conditions which are serious enough to cause death like malignant malaria.
Malignant is the opposite of benign which is a condition or cancer that is treatment and is generally considered to be non life threatening.
Malignant conditions including cancer that is malignant is sometimes curable but it depends on the type and stage of the cancer or malignancy.
Some types of cancer are more curable than others and there's no single cure for cancer.
Treatment options for malignant cancer and other cancers are bone marrow transplants, radiation, chemotherapy and surgery.