MKI67 and neoplasm: For the four patients who were diagnosed as having tumors in the PET(-) area, the characteristics of the tissues collected from the PET(+) and PET(-) areas of each patient were compared histopathologically, revealing that the tissues collected from the PET(+) areas tended to have a more complete histological picture of the tumor and a higher Ki-67 labeling index than the tissues collected from the PET(-) areas (Table 4).