Children's Cancer Foundation

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Children's Cancer Foundation  About Childhood Cancer  Diagnosis and Treatment Glossary  Malignant


  1. Describing a tumour that invades and destroys the tissue in which it originates and can spread to other sites in the body via the bloodstream and lymphatic system.  If untreated, such tumours cause progressive deterioration and death.  
  2. Describing any disorder that becomes life-threatening if untreated.