MKI67 and neoplasm: There was no significant correlation of the mean number of ki-67 positive tumor nuclei in pre treatment tumor samples with initial tumor uptake of either F-18-FDG or C-11-Choline, (C-11-Choline: r = -0.17, p = 0.57, n = 14; F-18-FDG: r = 0.24, p = 0.37, n = 16).