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Analytical Cellular Pathology
Volume 17, Issue 2, Pages 111-123
http://dx.doi.org/10.1155/1998/195432

Automatic Quantification of Immunohistochemically Stained Cell Nuclei Based on Standard Reference Cells

Petter Ranefall,1 Kenneth Wester,2 Ann-Catrin Andersson,2 Christer Busch,2 and Ewert Bengtsson1

1Centre for Image Analysis, Uppsala, Sweden
2Department of Pathology, Uppsala University, Sweden

Received 8 January 1998; Accepted 15 October 1998

Copyright © 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A fully automatic method for quantification of images of immunohistochemically stained cell nuclei by computing area proportions, is presented. Agarose embedded cultured fibroblasts were fixed, paraffin embedded and sectioned at 4 µm. They were then stained together with 4 µm sections of the test specimen obtained from bladder cancer material.

A colour based classifier is automatically computed from the control cells. The method was tested on formalin fixed paraffin embedded tissue section material, stained with monoclonal antibodies against the Ki67 antigen and cyclin A protein. Ki67 staining results in a detailed nuclear texture with pronounced nucleoli and cyclin A staining is obtained in a more homogeneously distributed pattern.

However, different staining patterns did not seem to influence labelling index quantification, and the sensitivity to variations in light conditions and choice of areas within the control population was low. Thus, the technique represents a robust and reproducible quantification method.

In tests measuring proportions of stained area an average standard deviation of about 1.5% for the same field was achieved when classified with classifiers created from different control samples.