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You are here: Home1 / Newsroom2 / News3 / Making the Role of AI in Medicine Explainable
Berlin – March 9, 2021

Making the Role of AI in Medicine Explainable

Making the Role of AI in Medicine Explainable - Analysis system for the diagnosis of breast cancer

Top: Determination of tumor-infiltrating lymphocytes (TiLs) using Explainable AI technology. Histological preparation of a breast carcinoma. Bottom: The result of the AI process shows a so-called heatmap, which highlights the tumor-infiltrating lymphocytes (TiLs) in red. Other tissue/cells: blue and green. © TUB/ Charité

/TUB/ Charité/ Researchers at TU Berlin and Charité – Universitätsmedizin Berlin as well as the University of Oslo have developed a new tissue-section analysis system for diagnosing breast cancer based on artificial intelligence (AI). Two further developments make this system unique: For the first time, morphological, molecular and histological data are integrated in a single analysis. Secondly, the system provides a clarification of the AI decision process in the form of heatmaps.
Pixel by pixel, these heatmaps show which visual information influenced the AI decision process and to what extent, thus enabling doctors to understand and assess the plausibility of the results of the AI analysis. This represents a decisive and essential step forward for the future regular use of AI systems in hospitals. The results of this research have now been published in Nature Machine Intelligence.

Image data provide high spatial detail
Cancer treatment is increasingly concerned with the molecular characterization of tumor tissue samples. Studies are conducted to determine whether and/or how the DNA has changed in the tumor tissue as well as the gene and protein expression in the tissue sample. At the same time, researchers are becoming increasingly aware that cancer progression is closely related to intercellular cross-talk and the interaction of neoplastic cells with the surrounding tissue – including the immune system.

Image data provide high spatial detail

Although microscopic techniques enable biological processes to be studied with high spatial detail, they only permit a limited measurement of molecular markers. These are rather determined using proteins or DNA taken from tissue. As a result, spatial detail is not possible and the relationship between these markers and the microscopic structures is typically unclear. “We know that in the case of breast cancer, the number of immigrated immune cells, known as lymphocytes, in tumor tissue has an influence on the patient’s prognosis. There are also discussions as to whether this number has a predictive value – in other words if it enables us to say how effective a particular therapy is,” says Professor Dr. Frederick Klauschen from the Institute of Pathology at the Charité.

Missing link between molecular and histological data

“The problem we have is the following: We have good and reliable molecular data and we have good histological data with high spatial detail. What we don’t have as yet is the decisive link between imaging data and high-dimensional molecular data,” adds Professor Dr. Klaus-Robert Müller, professor of machine learning at TU Berlin. Both researchers have been working together for a number of years now at the national AI center of excellence the Berlin Institute for the Foundations of Learning and Data (BIFOLD) located at TU Berlin.

The goal is to improve the quality of tumor diagnostics

It is precisely this symbiosis which the newly published approach makes possible. “Our system facilitates the detection of pathological alterations in microscopic images. Parallel to this, we are able to provide precise heatmap visualizations showing which pixel in the microscopic image contributed to the diagnostic algorithm and to what extent,” explains Müller. The research team has also succeeded in significantly further developing this process: “Our analysis system has been trained using machine learning processes so that it can also predict various molecular characteristics, including the condition of the DNA, the gene expression as well as the protein expression in specific areas of the tissue, on the basis of the histological images.

Next on the agenda are certification and further clinical validations – including tests in tumor routine diagnostics. However, Frederick Klauschen is already convinced of the value of the research: “The methods we have developed will make it possible in the future to make histopathological tumor diagnostics more precise, more standardized and qualitatively better.”

>> original press release

Original publication

Morphological and molecular breast cancer profiling through explainable machine learning, Nature Machine Intelligence

Making the Role of AI in Medicine Explainable

9. March 2021/in /by Alexandra Stein

Kontakt Aktuelles

Contact

Prof. Dr. Klaus-Robert Müller

Machine Learning

+49 30 314-78620
klaus-robert.mueller@tu-berlin.de

Prof. Dr. Frederick Klauschen

Charité – Universitätsmedizin Berlin

+49 30 450 536 053
frederick.klauschen@charite.de

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