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The correlation of Ki-67 staining indices with tumour doubling times in regrowing non-functioning pituitary adenomas

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Summary

In order to improve our ability to predict the regrowth of nonfunctioning pituitary adenomas, we tried to assess the correlation between growth fractions with Ki-67 and PCNA (proliferating cell nuclear antigen) and tumour doubling times in regrowing tumours, and also to find out any difference of growth fractions between the regrowing and the cured cases.

In 33 patients with non-functioning pituitary adenomas, 14 cases including 11 with cavernous sinus invasion showed residual tumour on MRI after the operation (regrowing group) and 19 cases had no tumour regrowth on MRI within 5 years after the operation (cured group). Immunocytochemical studies were done with monoclonal antibodies (anti-PCNA, anti-Ki-67: MIB-1). The growth fraction of each tumour was estimated by calculating the ratio of the positive nuclei to the total number of tumour cells with the aid of an image analyser (Mac SCOPE). The tumour doubling times were estimated from serial CT or MRI with the aid of the image analyser (NIH image).

Ki-67 staining indices ranged from 0.2% to 1.5% (n = 14, 0.86±0.10%; mean±SEM) in the regrowing group, and from 0.1% to 0.5% (n = 19, 0.23±0.03%) in the cured group. PCNA staining indices of the regrowing group ranged from 0.6% to 24% (n = 14, 3.7±1.6%). In the regrowing group, the tumour doubling times ranged from 200 to 2550 days (930±180 days), and showed a significant inverse correlation with Ki-67 staining indices, but no correlation with PCNA staining indices. The regrowing group showed a significantly higher Ki-67 staining index (n = 14, 0.86±0.10%) than the cured group (n = 19, 0.23±0.03%) (p<0.01).

These results indicate that immunocytochemical studies using MIB-1 may be better than those with PCNA for the prediction of regrowth in non-functioning pituitary adenomas. Immunocytochemical study with MIB-1 could lead to the accurate prediction of the rapid regrowing lesions in non-functioning adenomas.

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Ekramullah, S.M., Saitoh, Y., Arita, N. et al. The correlation of Ki-67 staining indices with tumour doubling times in regrowing non-functioning pituitary adenomas. Acta neurochir 138, 1449–1455 (1996). https://doi.org/10.1007/BF01411125

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