---
title: "Enhanced Reasoning for Biomedical Document-Level Relation"
description: "The authors propose CoRE, a cascade built on a detect-then-rethink idea. 33 references. Among them: 1."
authors: ["Haohua Song", "Wenhao Gu", "Zhijing Li", "Yunwenyu", "Tiantian Zhu", "Xiao Yang", "Zexuan Zhu"]
year: 2026
venue: "Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)"
source: "https://aclanthology.org/2026.acl-long.1517/"
doi: "10.18653/v1/2026.acl-long.1517"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/song-2026-enhanced-reasoning-biomedical-document-level/"
---
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# Enhanced Reasoning for Biomedical Document-Level Relation Extraction via a Novel Cascade Language Model Framework

**Authors:** Haohua Song, Wenhao Gu, Zhijing Li, Yunwenyu, Tiantian Zhu, [Xiao Yang](https://md.research.elamur.ai/free/en/authors/xiao-yang/) and Zexuan Zhu · **Year:** 2026 · **Venue:** [Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)](https://md.research.elamur.ai/free/en/venues/acl/) ([ACL 2026](https://md.research.elamur.ai/free/en/venues/acl/2026/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.acl-long.1517/) · [PDF](https://aclanthology.org/2026.acl-long.1517.pdf) · [DOI 10.18653/v1/2026.acl-long.1517](https://doi.org/10.18653/v1/2026.acl-long.1517) · [OpenAlex](https://openalex.org/W7166837909)

**Citations:** 1 citations (OpenAlex, 2026-10-14)

## Summary
Extracting relations between biomedical entities across a whole document is harder than doing it within one sentence. It requires linking evidence spread over several sentences, resolving synonymous mentions such as phenylketonuria and PKU, and applying specialised knowledge. Fine-tuned PLMs are cheap and accurate on easy cases but reason poorly. LLMs reason better, yet in this domain they tend to hallucinate relations that do not exist. The authors propose CoRE, a cascade built on a detect-then-rethink idea. A domain-specific PLM first scores every entity pair and keeps the predictions it is confident about. Uncertain pairs are passed to an LLM, which receives few-shot demonstrations chosen by a document-level semantic retriever. The LLM then reasons through an iterative chain-of-thought (ItCoT) procedure that consults a dynamic library of past errors to reflect on and correct its answers. On BioRED and CDR, CoRE beats PLM-only, LLM-only and naive cascade baselines while calling the LLM far less often. This makes LLM-assisted literature mining more accurate and cheaper to deploy.

## Key points
- **Routing signal:** confidence is the PLM's highest relation probability. On the CDR dev set, DocuNet's high-confidence predictions proved much more reliable than its low-confidence ones. LLMs, by contrast, over-predicted relations on no-relation pairs.
- **Overall F1 against a cascaded GPT-RE baseline (Table 5):**
  - CDR: CoRE 88.20 vs. 86.03 for Cascade + GPT-RE.
  - BioRED: CoRE 66.35 vs. 62.79 for Cascade + GPT-RE.
  - On the low-confidence subsets, CoRE's average F1 gain over standalone GPT-RE was +5.39 on CDR and +5.30 on BioRED.
- **Hallucination analysis (CDR low-confidence subset):**
  - With Deepseek-v3.2, the false positive rate (FPR) fell from 41.42% to 26.19% and the false discovery rate (FDR) from 48.45% to 37.28%.
  - With GPT-4o, FPR fell from 25.84% to 22.83%.
  - Naive CoT actually increased false positives compared with the plain baseline.
- **Efficiency on the CDR test set:** selective routing cut API cost by about 45.55% ($54.7 → $29.8) and latency by about 46.89% (1,220 → 648 minutes).
- **Limitations:**
  - The routing threshold must be tuned by hand on a validation set.
  - Retrieval depends on the training set containing relevant examples.
  - Low-confidence samples incur extra latency.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

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## Cite

Cite as: Haohua Song, Wenhao Gu, Zhijing Li, Yunwenyu, Tiantian Zhu, Xiao Yang and Zexuan Zhu. 2026. Enhanced Reasoning for Biomedical Document-Level Relation Extraction via a Novel Cascade Language Model Framework. Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers).

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{song2026enhanced,
  title = {{Enhanced Reasoning for Biomedical Document-Level Relation Extraction via a Novel Cascade Language Model Framework}},
  author = {Haohua Song, Wenhao Gu, Zhijing Li, Yunwenyu, Tiantian Zhu, Xiao Yang and Zexuan Zhu},
  booktitle = {Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  year = {2026},
  doi = {10.18653/v1/2026.acl-long.1517},
  url = {https://doi.org/10.18653/v1/2026.acl-long.1517}
}
```

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## References

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*Updated 2 November 2026*