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Case study: Ki-67 proliferation index calculation by AI

Pathologists can automate and improve the accuracy of calculating Ki-67 in any image. This case study describes the benefits of using the Aiforia software.
Written by Aiforia

Jenni Säilä, a researcher at the HUSLAB Department of Pathology, working together with her supervisor Tiina Vesterinen, developed a deep learning AI model with Aiforia® Create to quantify Ki-67 positive and negative tumor cells in rare pulmonary carcinoid (PC) tumors as a part of her thesis study.

Ki-67 is a commonly used molecular target in cancer diagnostics, and its proliferation index is an essential parameter in PC tumor diagnostics.

Traditional methods are fallible

Jenni’s study material consisted of five tissue microarray slides, which included 127 PC tumors. The slides were immunohistochemically labeled with a Ki-67 antibody, and Jenni used the digitized slides to train her own AI model with Aiforia® Create to identify Ki-67-positive and negative tumor cells.

The results Aiforia produced were referenced against a pathologist completing the analysis manually and compared with those produced by non-AI-based image analysis software. The analysis of immunohistochemical stains with these traditional methods is often time-consuming and prone to inter- and intra-observer subjectivity.


You don’t have to be perfect to use AI

Ki-67 proliferation index”The AI modeI was better at analyzing the samples. You didn’t have to exclude any areas because Aiforia was able to detect everything. Compared to other image analysis methods in which if there are any issues with the samples like staining errors or broken tissue, the other programs are not able to count in these areas,” describes Jenni.

The convolutional neural networks, which power Aiforia’s deep learning AI, allow image analysis to perform at a level far beyond human capabilities. Perfect training material or high quantities of images or slides are not needed to train or create a robust AI model.

Aiforia is also agile in providing a unique image analysis solution, as AI models can be trained to detect any feature in any image. Tiina explains: ”You can’t train yourself with traditional image analysis methods. You can’t fully customize them to meet your needs. With Aiforia, you have the control; you can improve and adapt the methodology to find exactly what you are looking for.”

”Our aim is to use this AI algorithm also in clinical diagnostics to assist pathologists. Since preliminary results are promising, we plan to train the algorithm further to calculate Ki-67 proliferation index also for other neuroendocrine tumors,” Tiina concludes.


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