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Pathologic Prognostic Factors of Pineal Parenchymal Tumor of Intermediate Differentiation

Pathologic Prognostic Factors of Pineal Parenchymal Tumor of Intermediate Differentiation Introduction:Pineal parenchymal tumor of intermediate differentiation (PPTID) is an uncommon tumor of the pineal gland. Although this behaves as a grade II/III tumor, the exact clinical behavior is not well known. There is no well-established pathologic factor that can predict the behavior of PPTID.Aim and Objective:The aim of this study was to determine the pathologic prognostic factors in PPTID.Materials and Methods:All PPTID cases diagnosed between 2006 and 2016 were analyzed retrospectively. Immunohistochemistry for synaptophysin, neurofilament protein (NFP), glial fibrillar acid protein, NeuN, and Ki-67 were performed in all cases. Cases were classified arbitrarily into low grade (mitosis <4/10 hpf and Ki-67 <5%) and high grade (mitosis ≥4/10 hpf and Ki-67 ≥5%). Clinical details including follow-up information were retrieved from the patients’ files.Results:A total of 16 patients (6 low grade and 10 high grade) were included in this study. The age ranged from 2 to 55 years (average, 28.2) with a mild male preponderance (male:female, 1.67:1). All cases showed strong and diffuse positivity for synaptophysin. Focal NFP positivity was seen in 2 low-grade and 3 high-grade tumors. Only 2 cases showed focal NeuN positivity. Average Ki-67 index was 1.7% and 12.6% in low-grade and high-grade tumors, respectively. All patients with low-grade tumor were alive without recurrence. Among the patients with high-grade tumors, 2 had local recurrence, 1 had spinal metastasis, and 3 patients died.Conclusion:Mitosis and Ki-67 proliferation index are the most important pathologic prognostic factors in PPTID. NFP expression does not carry any prognostic significance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Immunohistochemistry & Molecular Morphology Wolters Kluwer Health

Pathologic Prognostic Factors of Pineal Parenchymal Tumor of Intermediate Differentiation

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References (15)

Publisher
Wolters Kluwer Health
Copyright
Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.
ISSN
1541-2016
eISSN
1533-4058
DOI
10.1097/PAI.0000000000000565
Publisher site
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Abstract

Introduction:Pineal parenchymal tumor of intermediate differentiation (PPTID) is an uncommon tumor of the pineal gland. Although this behaves as a grade II/III tumor, the exact clinical behavior is not well known. There is no well-established pathologic factor that can predict the behavior of PPTID.Aim and Objective:The aim of this study was to determine the pathologic prognostic factors in PPTID.Materials and Methods:All PPTID cases diagnosed between 2006 and 2016 were analyzed retrospectively. Immunohistochemistry for synaptophysin, neurofilament protein (NFP), glial fibrillar acid protein, NeuN, and Ki-67 were performed in all cases. Cases were classified arbitrarily into low grade (mitosis <4/10 hpf and Ki-67 <5%) and high grade (mitosis ≥4/10 hpf and Ki-67 ≥5%). Clinical details including follow-up information were retrieved from the patients’ files.Results:A total of 16 patients (6 low grade and 10 high grade) were included in this study. The age ranged from 2 to 55 years (average, 28.2) with a mild male preponderance (male:female, 1.67:1). All cases showed strong and diffuse positivity for synaptophysin. Focal NFP positivity was seen in 2 low-grade and 3 high-grade tumors. Only 2 cases showed focal NeuN positivity. Average Ki-67 index was 1.7% and 12.6% in low-grade and high-grade tumors, respectively. All patients with low-grade tumor were alive without recurrence. Among the patients with high-grade tumors, 2 had local recurrence, 1 had spinal metastasis, and 3 patients died.Conclusion:Mitosis and Ki-67 proliferation index are the most important pathologic prognostic factors in PPTID. NFP expression does not carry any prognostic significance.

Journal

Applied Immunohistochemistry & Molecular Morphology – Wolters Kluwer Health

Published: Mar 1, 2019

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