MKI67 and neoplasm: In addition, the size of the tumor in these patients was larger (25 mm versus 19 mm; p = 0.008), the incidence of grade 3 tumors more frequent (p = 0.01), the grade 1 less frequent (p = 0.02), the percentage of PR positive lesions was less (p = 0.02), the mean Ki-67 index was higher (27% versus 20%; p = 0.003), the Luminal A tumor was less frequent (p = 0.001), and the Luminal B was more frequent (p = 0.02).