MKI67 and neoplasm: In the analyzed group of patients, a statistically significant association was observed between the ABCG2 profile and tumor grade (r = 0.31, p = 0.0002), chemotherapy (r = 0.27, p = 0.002), Ki67 expression (r = 0.31, p = 0.0004), patients survival (r = −0.18, p = 0.02), progression (r = 0.23, p = 0.007), and radiotherapy (r = 0.17, p = 0.05).