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Acta Neurochirurgica

, Volume 161, Issue 6, pp 1149–1156 | Cite as

Ki-67 labeling index and expression of p53 are non-predictive for invasiveness and tumor size in functional and nonfunctional pituitary adenomas

  • Florian GrimmEmail author
  • Roland Maurus
  • Rudi Beschorner
  • Georgios Naros
  • Milan Stanojevic
  • Isabel Gugel
  • Sabrina Giese
  • Georg Bier
  • Benjamin Bender
  • Jürgen Honegger
Original Article - Pituitaries
Part of the following topical collections:
  1. Pituitaries

Abstract

Background

It is still controversial whether an increased proliferation index is correlated with the tumor invasiveness of pituitary adenomas. A homogeneous large monocentric series of pituitary adenomas was retrospectively analyzed. The correlation between the proliferation indices (Ki-67 and p53 expression levels) and invasiveness and size of pituitary adenomas was investigated in primary operated and recurrent adenomas.

Method

Four hundred thirty-nine patients after resection of pituitary adenomas were retrospectively included (43 recurrent tumors, 196 null cell adenomas, 86 somatotroph adenomas, 55 corticotroph adenomas, 55 prolactinomas, 4 thyreotroph adenomas). The maximum tumor diameter and tumor invasiveness in Knosp grading were assessed and Ki-67 and p53 immunostaining was performed. The role of invasiveness was evaluated using a cumulative odds ordinal logistic regression. For calculating the effect of tumor size, a one-way analysis of variance (ANOVA) was conducted.

Results

Overall and in the subgroups, no significant correlation between proliferation indices and mean tumor diameter was found. No significant predictive expression value of Ki-67 and p53 on tumor invasiveness and in recurrent tumors could be demonstrated. There was a tendency that Ki-67 LI and p53 LI are higher in recurrent corticotroph adenomas and lactotroph adenomas but values did not reach the significant level.

Conclusion

Invasive character of pituitary adenomas is neither correlated with increased Ki-67 LI nor with increased p53 expression. Proliferation parameters are independent from adenoma size at initial presentation. The partly elevated expression of Ki-67 in recurrent tumors underlines the clinical importance of the marker.

Keywords

Pituitary adenomas p53 Ki-67 Invasiveness 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (University Hospital Tübingen, Germany) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

For this type of study, formal consent is not required.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Florian Grimm
    • 1
    Email author
  • Roland Maurus
    • 1
  • Rudi Beschorner
    • 2
  • Georgios Naros
    • 1
  • Milan Stanojevic
    • 1
  • Isabel Gugel
    • 1
  • Sabrina Giese
    • 1
  • Georg Bier
    • 3
  • Benjamin Bender
    • 3
  • Jürgen Honegger
    • 1
  1. 1.Department for NeurosurgeryUniversity Hospital TübingenTübingenGermany
  2. 2.Institute of Pathology and Neuropathology, Department of NeuropathologyUniversity Hospital TübingenTübingenGermany
  3. 3.Department for NeuroradiologyUniversity Hospital TübingenTübingenGermany

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