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    Area of Science:

    • Natural Language Processing
    • Artificial Intelligence in Medicine
    • Clinical Informatics

    Background:

    • Large language models like GPT-3.5 and GPT-4 show promise for clinical natural language processing tasks.
    • However, their direct application to clinical named entity recognition (NER) may not achieve optimal performance without specific tuning.
    • Evaluating and enhancing GPT models for specialized clinical NER is crucial for their effective integration into healthcare.

    Purpose of the Study:

    • To quantify the capabilities of GPT-3.5 and GPT-4 on clinical NER tasks.
    • To develop and evaluate a task-specific prompt framework to improve GPT model performance in clinical NER.
    • To compare the performance of enhanced GPT models against a specialized clinical NER model, BioClinicalBERT.

    Main Methods:

    • GPT-3.5 and GPT-4 were evaluated on two clinical NER tasks: extracting concepts from clinical notes (MTSamples) and identifying adverse events from safety reports (VAERS).
    • A prompt framework was developed, including baseline prompts, guideline-based prompts, error analysis instructions, and few-shot learning samples.
    • Model performance was assessed using F1 scores and compared to BioClinicalBERT.

    Main Results:

    • Without specialized prompts, GPT-3.5 and GPT-4 achieved lower F1 scores on both datasets compared to BioClinicalBERT.
    • The proposed prompt framework significantly improved GPT model performance, with GPT-4 achieving F1 scores of 0.861 on MTSamples and 0.736 on VAERS when using all prompt components.
    • Despite improvements, the enhanced GPT models still lagged behind BioClinicalBERT but required fewer training samples.

    Conclusions:

    • Direct application of GPT models to clinical NER is suboptimal.
    • A task-specific prompt framework incorporating medical knowledge and training samples substantially enhances GPT models' performance for clinical NER.
    • These findings highlight the potential of prompt engineering to adapt large language models for practical clinical applications.