Calculation of the Ki67 index in pancreatic neuroendocrine tumors: a comparative analysis of four counting methodologies

Ki67 index is now an essential part of classification of pancreatic neuroendocrine tumors. However, its adaptation into daily practice has been fraught with challenges related to counting methodology. In this study, three reviewers used four counting methodologies to calculate Ki67 index in 68 well-...

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Published in:Modern pathology 2015-05, Vol.28 (5), p.686-694
Main Authors: Reid, Michelle D, Bagci, Pelin, Ohike, Nobuyuki, Saka, Burcu, Erbarut Seven, Ipek, Dursun, Nevra, Balci, Serdar, Gucer, Hasan, Jang, Kee-Taek, Tajiri, Takuma, Basturk, Olca, Kong, So Yeon, Goodman, Michael, Akkas, Gizem, Adsay, Volkan
Format: Article
Language:English
Subjects:
Humans
Image Processing, Computer-Assisted - methods
Ki-67 Antigen - analysis
Mitotic Index - methods
Mitotic Index - standards
Neuroendocrine Tumors - pathology
Pancreatic Neoplasms - pathology
Reproducibility of Results
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Summary:Ki67 index is now an essential part of classification of pancreatic neuroendocrine tumors. However, its adaptation into daily practice has been fraught with challenges related to counting methodology. In this study, three reviewers used four counting methodologies to calculate Ki67 index in 68 well-differentiated pancreatic neuroendocrine tumors: (1) 'eye-ball' estimation, which has been advocated as reliable and is widely used; (2) automated counting by image analyzer; (3) manual eye-counting (eye under a microscope without a grid); and (4) manual count of camera-captured/printed image. Pearson's correlation (R) was used to measure pair-wise correlation among three reviewers using all four methodologies. Average level of agreement was calculated using mean of R values. The results showed that: (1) 'eye-balling' was least expensive and fastest (average time
ISSN:0893-3952
1530-0285
DOI:10.1038/modpathol.2014.156