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Artificial Intelligence Tool Accurately Identifies Cancer Type and Genetic Changes in Each Patient's Lung Tumor

Approach Promises to Instantly Determine Which Patients Will Respond to Targeted Therapies


News provided by

NYU School of Medicine

Sep 17, 2018, 11:40 ET

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NEW YORK, Sept. 17, 2018 /PRNewswire/ -- A new computer program can analyze images of patients' lung tumors, specify cancer types, and even identify altered genes driving abnormal cell growth, a new study shows.  

The image shows how an AI tool analyzes a slice of cancerous tissue to create a map that tells apart two lung cancer types, with squamous cell carcinoma in red, lung squamous cell carcinoma in blue, and normal lung tissue in gray.
The image shows how an AI tool analyzes a slice of cancerous tissue to create a map that tells apart two lung cancer types, with squamous cell carcinoma in red, lung squamous cell carcinoma in blue, and normal lung tissue in gray.

Led by researchers at NYU School of Medicine and published online September 17 in Nature Medicine, the study found that a type of artificial intelligence, or "machine learning," program could distinguish -- with 97 percent accuracy -- between adenocarcinoma and squamous cell carcinoma, two lung cancer types that experienced pathologists at times struggle to parse without confirmatory tests.

In addition, the study's AI was also able to, again from analyzing images, determine whether abnormal versions of six genes linked to lung cancer – including EGFR, KRAS and TP53 – were present in cells, with an accuracy that ranged from 73 to 86 percent depending on the gene. Such genetic changes or mutations often cause the abnormal growth seen in cancer, but can also change a cell's shape and interactions with its surroundings, providing visual clues for automated analysis.

Determining which genes are changed in each tumor has become vital with the increased use of targeted therapies that work only against cancer cells with specific mutations, researchers say. About 20 percent of patients with adenocarcinoma, for instance, are known to have mutations in the gene epidermal growth factor receptor or EGFR, which can now be treated with approved drugs.

But the genetic tests currently used to confirm the presence of mutations can take weeks to return results, say the study authors. 

"Delaying the start of cancer treatment is never good," says senior study author Aristotelis Tsirigos, PhD, associate professor in the Department of Pathology at NYU School of Medicine and NYU Langone Health's Perlmutter Cancer Center. "Our study provides strong evidence that an AI approach will be able to instantly determine cancer subtype and mutational profile to get patients started on targeted therapies sooner."

Machine Learning

In the current study, the research team designed statistical techniques that gave their program the ability to "learn" how to get better at a task but without being told exactly how. Such programs build rules and mathematical models that enable decision-making based on data examples fed into them, with the program getting "smarter" as the amount of training data grows.

Newer AI approaches, inspired by nerve cell networks in the brain, use increasingly complex circuits to process information in layers, with each step feeding information into the next, and assigning more or less importance to each piece of information along the way. The current team trained a deep convolutional neural network, Google's Inception v3, to analyze slide images obtained from The Cancer Genome Atlas, a database of images where cancer diagnoses had already been determined. That let the researchers to measure how well their program could be trained to accurately and automatically classify normal versus diseased tissue.

Interestingly, the study found that about half of the small percentage of tumor images misclassified by the study AI program were also misclassified by the pathologists, highlighting the difficulty in distinguishing between the two lung cancer types. On the other hand, 45 out of 54 of the images misclassified by at least one of the pathologist in the study were assigned to the correct cancer type by the machine learning program, suggesting that artificial intelligence could offer a useful second opinion.

"In our study, we were excited to improve on pathologist-level accuracies, and to show that AI can discover previously unknown patterns in the visible features of cancer cells and the tissues around them," says co-corresponding author Narges Razavian, PhD, assistant professor in the departments of Radiology and Population Health. "The synergy between data and computational power is creating unprecedented opportunities to improve both the practice and the science of medicine."   

Moving forward, the team plans to keep training its AI program with data until it can determine which genes are mutated in a given cancer with more than 90 percent accuracy, at which point they will begin seeking government approval to use the technology clinically, and in the diagnosis of several cancer types.   

Along with Tsirigos and Razavian, authors from the NYU School of Medicine were lead investigators Nicolas Coudray of the Applied Bioinformatics Laboratories and Paolo Santiago Ocampo of the Department of Pathology; as well as Navneet Narula, Matija Snuderl, and Andre Moreira in the Department of Pathology, and David Fenyö, in the Department of Biochemistry and Molecular Pharmacology. Also a study author was Theodore Sakellaropoulos in the School of Mechanical Engineering at the National Technical University of Athens in Greece.

The study was supported by Perlmutter Cancer Center support grant, P30CA016087. The study authors' approach is available at https://github.com/ncoudray/DeepPATH.

Media Contact: Gregory Williams, 212-404-3500, [email protected]

SOURCE NYU School of Medicine

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