Evidence map›Paper›PMID 41107408›Full record

ArticleNPJ digital medicine2025

When helpfulness backfires: LLMs and the risk of false medical information due to sycophantic behavior.

Shan Chen, Mingye Gao, Kuleen Sasse, Thomas Hartvigsen, Brian Anthony, Lizhou Fan, Hugo Aerts, Jack Gallifant, Danielle S Bitterman

Abstract read
In one paragraph

Article in NPJ digital medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 41 papers.

0numbers the graph read from it
0cells of the map it votes in
41citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

41 citing papers in PubMed.

  1. Article
  2. Article
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  4. Validating LLM judges for automated oversight of patient communication.medRxiv : the preprint server for health sciences · 2026
    Article
  5. The Utility of Large Language Models to Assist With Emergency Triage Decisions Within Otolaryngology.Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery · 2026
    Article
  6. New article types atBMJ global health · 2026
    Article
  7. Review
  8. Article
  9. Article
  10. Review
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  13. FaithfulnessFindings of ACL. ACL · 2026
    Article
  14. Review
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  16. Article
  17. Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

9 authors.

Shan Chen *Artificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical School, Boston, MA, USA.
Mingye Gao *Massachusetts Institute of Technology, Cambridge, MA, USA.
Kuleen SasseJohns Hopkins University, Baltimore, MD, USA.
Thomas HartvigsenSchool of Data Science, University of Virginia, Charlottesville, VA, USA.
Brian AnthonyMassachusetts Institute of Technology, Cambridge, MA, USA.
Lizhou FanArtificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical School, Boston, MA, USA.
Hugo AertsArtificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical School, Boston, MA, USA.
Jack GallifantArtificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical School, Boston, MA, USA.
Danielle S BittermanArtificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical School, Boston, MA, USA. dbitterman@bwh.harvard.edu.

Funding

Harvard Clinical and Translational Science CenterUM1TR004408 · NCATS · HARVARD MEDICAL SCHOOL · PI Lindsey Robert Baden, Lee Marshall Nadler · 2023 to 2026
$43.3M
The Boston Lung Cancer Survival CohortU01CA209414 · NCI · HARVARD UNIVERSITY D/B/A HARVARD SCHOOL OF PUBLIC HEALTH · PI David C Christiani · 2017 to 2026
$12.2M
Shared Resource Core 2: Clinical Artificial Intelligence CoreU54CA274516 · NCI · DANA-FARBER CANCER INST · PI Dipanjan Chowdhury · 2023 to 2026
$8.1M
Quantitative Radiomics System Decoding the Tumor PhenotypeU24CA194354 · NCI · DANA-FARBER CANCER INST · PI AERTS, HUGO, QUACKENBUSH, JOHN · 2015 to 2019
$3.5M
Genotype and Imaging Phenotype Biomarkers in Lung CancerU01CA190234 · NCI · DANA-FARBER CANCER INST · PI AERTS, HUGO, QUACKENBUSH, JOHN · 2015 to 2019
$3.3M
Informatics strategies to improve immune-related adverse event detection in cancer patientsR01CA294033 · NCI · BRIGHAM AND WOMEN'S HOSPITAL · PI Hugo Aerts · 2024 to 2026
$1.3M
Google Research PhD FellowshipNational Institutes of Health,United States U54CA274516-01A1NCATS NIH HHS UM1 TR004408NCI NIH HHS R01 CA294033NCI NIH HHS U01 CA190234NCI NIH HHS U01 CA209414NCI NIH HHS U24 CA194354NCI NIH HHS U54 CA274516NIH HHS R01CA294033
6 · The paper itself

Abstract

Large language models (LLMs) exhibit a vulnerability arising from being trained to be helpful: a tendency to comply with illogical requests that would generate false information, even when they have the knowledge to identify the request as illogical. This study investigated this vulnerability in the medical domain, evaluating five frontier LLMs using prompts that misrepresent equivalent drug relationships. We tested baseline sycophancy, the impact of prompts allowing rejection and emphasizing factual recall, and the effects of fine-tuning on a dataset of illogical requests, including out-of-distribution generalization. Results showed high initial compliance (up to 100%) across all models, prioritizing helpfulness over logical consistency. Prompt engineering and fine-tuning improved performance, improving rejection rates on illogical requests while maintaining general benchmark performance. This demonstrates that prioritizing logical consistency through targeted training and prompting is crucial for mitigating the risk of generating false medical information and ensuring the safe deployment of LLMs in healthcare.

Identifiers

PMID41107408
PMCPMC12534679

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.