Semi-quantitative assessment of Survivin expression was based on the mean percentage of positive tumour cells in at least five high-power fields (×400) assigned to one of five categories: (a) 0=<5%; (b) 1=5–25%; (c) 2=25–50%; (d) 3=50–75%; (e) 4=>75%. The gene discussed is BIRC5; the disease is neoplasm.