About this trial
A multicentre, prospective, cluster-randomised, parallel-controlled real-world effectiveness study evaluating whether a rare-disease diagnostic large language model can improve diagnostic quality, efficiency, and health-economic outcomes for physicians managing patients with suspected rare or diagnostically unresolved disease.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
Any age. Legal guardian co-signs consent for minors or individuals lacking legal capacity.
Diagnostically unresolved or suspected rare disease, with at least one prior complete clinical evaluation at a secondary-level or higher institution yielding no confirmed explanatory diagnosis.
First presentation to the enrolling institution for the current condition, with no prior records in the institutional HIS or outpatient system.
No prior genetic testing related to the current condition; no results or reports available.
Disqualifiers
Confirmed diagnosis (clinical, pathological, or molecular) explaining the primary symptoms.
Emergency presentation, critical illness, or any condition incompatible with trial participation.
Neither patient nor legally authorised proxy able to complete follow-up.
Concurrent enrollment in another interventional study with diagnostic accuracy or genetic testing yield as a primary endpoint.
Trial design
Parallel
Treatments tested in this trial
AI system
Other interventionPrior to consultation, the AI system will interact with patients to build a personalised medical profile, generate a structured clinical analysis, and recommend candidate diagnoses. During the encounter, the AI system will interact with and be reviewed by physicians.
Treatment groups
Trial outcomes
Primary outcomes
Top-3 Candidate Diagnostic Accuracy
The proportion of patients whose physician-provided up to 3 candidate diagnoses at the first study visit include at least one concordant with the final reference diagnosis (denominator: all randomised patients with a blinded-adjudicated confirmed reference diagnosis; intention-to-treat population).
Rare Genetic Disease Diagnostic Yield
The proportion of all randomised patients who underwent genetic testing and had a clinically significant genetic variant (pathogenic or likely pathogenic) confirmed by an independent review committee blinded to arm assignment (denominator: all randomised patients). Variant pathogenicity classified per predefined ACMG/AMP guidelines.
Secondary outcomes
Overall Diagnostic Yield
Proportion of all randomised patients who receive a confirmed clinical diagnosis (confirmed by independent expert review) during the trial period.
Overall Diagnostic Accuracy
Among patients with a confirmed clinical diagnosis, the proportion whose diagnosis is concordant with the blinded-adjudicated final reference diagnosis.
Time to Diagnosis
Days from first visit to obtaining clinical diagnosis within the follow-up period. Patients without a confirmed diagnosis censored at end of follow-up.
Consultation Duration
In-room consultation time will be recorded, measured, and compared between arms. Pre-consultation AI interaction time and total visit time are additionally recorded for the intervention arm to fully characterise efficiency impact.
Sponsors and contacts
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Peking Union Medical College Hospital
Lead sponsor
Cangzhou Central Hospital
Collaborator
Zhangzhou Municipal Hospital
Collaborator
Dongguan People's Hospital
Collaborator
First People's Hospital of Foshan
Collaborator
Tibet Autonomous Region People's Hospital
Collaborator
Guizhou Provincial People's Hospital
Collaborator
Tianjin Children's Hospital
Collaborator
The First People's Hospital of Yunnan
Collaborator
Qinghai People's Hospital
Collaborator
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