MKI67 and neoplasm: Interestingly, the expression of Ki67 showed varying results between 2% and 85%, but could not be linked to the presence of lymph node metastases or advanced tumor stages, as the only case in which a tumor recurrence was observed showed a low proliferation rate (compared to e.g. striking 85% in case number 6 with no recurrence during an observation period of 22 months).