• Cancer is the common name given to all the various forms of malignant neoplasia. (link to What is neoplasia?) 
  • A tumour is a mass of cells that are growing out of control. There are two main types of tumours:   
    • Malignant tumours or cancers and benign tumours.  

As a general rule, malignant tumours (cancers) are more life threatening than benign tumours because of the risk of spread throughout the body. (link to Why is malignant neoplasia called cancer?)