In analysed literature, which includes different groups of patients with respect to the number of patients (1–46), their age (children and adults) and histopathological type of craniopharyngioma, the range of values of proliferation index Ki67 in primary tumours was 1.68–22.12% (minimum value 0%, maximum value 49%), as presented in Table 2 [11, 14–21, 38]. The gene discussed is MKI67; the disease is craniopharyngioma.