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Recognizing Study Lineage Is Not Enough: Over-Crediting Same-Trial Evidence in LLM-Based Medical Verification

L5 · ResearcherResearcharXiv· 10/16/2026

Reveals critical limitations in LLM reasoning for medical evidence synthesis that researchers must address.

AI Summary

LLMs over-credit duplicate evidence from same clinical trials in medical verification, showing a gap between recognizing study lineage and properly weighting evidence.

Excerpt

Publication count is not study count. A model can identify shared trial lineage correctly in a direct task yet over-credit a second publication from the same trial when aggregating evidence. We evaluate this behavior in medical LLM verification using 14 source-audited clinical families and five model conditions. The families span provenance, clinical applicability, result direction, and composition; the provenance families provide the direct lineage tests. Recognition and aggregation are separat

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