AI eroded doctors’ ability to spot cancer within months in Lancet study
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A researcher predicted that the effects of de-skilling will “probably be higher” as AI becomes more powerful.
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LONDON – Artificial intelligence (AI), touted for its potential to transform medicine, led to some doctors losing skills after just a few months in a new study.
AI helped health professionals to better detect pre-cancerous growths in the colon, but when the assistance was removed, their ability to find tumours dropped by about 20 per cent compared with rates before the tool was ever introduced, according to findings published on Aug 13.
Healthcare systems around the world are embracing AI with a view to boosting patient outcomes and productivity.
The British government in 2025 announced £11 million (S$19 million) in funding for a new trial to test how AI can help catch breast cancer earlier.
The AI in the study probably prompted doctors to become over-reliant on its recommendations, “leading to clinicians becoming less motivated, less focused, and less responsible when making cognitive decisions without AI assistance”, the scientists said in the paper.
They surveyed four endoscopy centres in Poland and compared detection success rates three months before AI implementation and three months after. Some colonoscopies were performed with AI and some without, at random.
The results were published in The Lancet Gastroenterology and Hepatology journal.
Professor Yuichi Mori, a researcher at the University of Oslo and one of the scientists involved, predicted that the effects of de-skilling will “probably be higher” as AI becomes more powerful.
What’s more, the 19 doctors in the study were highly experienced, having performed more than 2,000 colonoscopies each.
The effect on trainees or novices might be starker, said Dr Omer Ahmad, a consultant gastroenterologist at University College Hospital London.
“Although AI continues to offer great promise to enhance clinical outcomes, we must also safeguard against the quiet erosion of fundamental skills required for high-quality endoscopy,” Dr Ahmad, who was not involved in the research, wrote a comment alongside the article.
A study conducted by Massachusetts Institute of Technology in 2025 raised similar concerns after finding that using OpenAI’s ChatGPT to write essays led to less brain engagement and cognitive activity. BLOOMBERG
