A tumour is an abnormal growth of tissue resulting from the progressive, uncontrolled multiplication of cells.
The onset of this disease is usually due to a genetic mutation of the cell DNA that transforms the cell and the surrounding cell clones. This leads to abnormal growth, ignoring the signals of growth regulation in the surrounding region. Once these cells become invasive, they can infiltrate and penetrate the lymphatic and blood vessels, reaching other parts of the body and forming metastases.
What is the prevalence of brain tumours?