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Open Access Highly Accessed Research article

Automated recognition of cell phenotypes in histology images based on membrane- and nuclei-targeting biomarkers

Bilge Karaçalı, Alexandra P Vamvakidou and Aydın Tözeren*

Author Affiliations

Center for Integrated Bioinformatics, School of Biomedical Engineering, Science and Health Systems Drexel University 3141 Chestnut Street Philadelphia PA 19104 USA

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BMC Medical Imaging 2007, 7:7  doi:10.1186/1471-2342-7-7

Published: 6 September 2007

Abstract

Background

Three-dimensional in vitro culture of cancer cells are used to predict the effects of prospective anti-cancer drugs in vivo. In this study, we present an automated image analysis protocol for detailed morphological protein marker profiling of tumoroid cross section images.

Methods

Histologic cross sections of breast tumoroids developed in co-culture suspensions of breast cancer cell lines, stained for E-cadherin and progesterone receptor, were digitized and pixels in these images were classified into five categories using k-means clustering. Automated segmentation was used to identify image regions composed of cells expressing a given biomarker. Synthesized images were created to check the accuracy of the image processing system.

Results

Accuracy of automated segmentation was over 95% in identifying regions of interest in synthesized images. Image analysis of adjacent histology slides stained, respectively, for Ecad and PR, accurately predicted regions of different cell phenotypes. Image analysis of tumoroid cross sections from different tumoroids obtained under the same co-culture conditions indicated the variation of cellular composition from one tumoroid to another. Variations in the compositions of cross sections obtained from the same tumoroid were established by parallel analysis of Ecad and PR-stained cross section images.

Conclusion

Proposed image analysis methods offer standardized high throughput profiling of molecular anatomy of tumoroids based on both membrane and nuclei markers that is suitable to rapid large scale investigations of anti-cancer compounds for drug development.