REVIEW 5 major objections 6 minor 35 references
ImmunoFOMO: Are Language Models missing what oncologists see?
T0 review · 5 major / 6 minor · reviewed 2026-08-07 · deepseek-v4-flash
Pith's one-line read This paper argues that domain-specific pre-trained language models can identify fine-grained 'hallmark of immunotherapy' concepts in breast cancer abstracts more accurately than large language models, while large models still capture…
desk verdict A useful new benchmark with a load-bearing evaluation flaw: Tier-II/III performance is measured via aggregation to Tier-I, so the headline claim that small models beat large ones on fine-grained concepts is not yet supported. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing object is the curated three-tier hallmark-of-immunotherapy hierarchy: nine Tier-I hallmarks such as 'Tumor genome and epigenome', 'Tumour microenvironment', and 'Systemic factors'; twenty-seven Tier-II subcategories; and 177 Tier-III keywords, adapted from published hallmark-of-response and hallmark-of-resistance taxonomies. The evaluation machinery runs each abstract through two unsupervised routes: embedding-similarity matching for the five pre-trained models and zero-shot prompting with a fixed prompt for the five large language models. For scoring, predictions at Tier-II and Tier-III are mapped back to their Tier-I parent using the curated hierarchy and compared with the oncologist's Tier-I gold labels using weighted F1 and agreement metrics.
What would settle it
Annotate the same 239 abstracts with Tier-II and Tier-III gold labels from multiple oncologists and score the models directly on those tiers; if large models match or exceed PubMedBERT at Tier-III under direct scoring, the paper's central claim is refuted.
Extended reading notes
Core claim
The central discovery is that conceptual granularity, not model scale, drives which language model class is more reliable for biomedical concept identification. In the paper's unsupervised evaluations, the SLM pool improves from Tier-I to Tier-III, with PubMedBERT reaching a weighted F1 of about 0.50 at Tier-III and 0.42 overall, while the LLM pool peaks at Tier-II and then drops sharply at Tier-III, with the best LLM, Gemma-2-9B, reaching 0.38 at Tier-III and 0.40 overall. The paper interprets this as smaller models retaining focused domain knowledge from smaller pretraining corpora, whereas large models absorb broader but shallower coverage that helps with coarse categories and hurts fine-grained distinctions. It also reports that both model pools have low agreement with the expert oncologist, with Cohen's kappa below 0.12 for SLMs and below 0.17 for LLMs across all tiers.
Load-bearing premise
The argument's load-bearing premise is that comparing lower-tier model outputs after mapping them up to Tier-I labels, measured against a single oncologist's Tier-I annotations, genuinely tests whether models understand fine-grained concepts; if the mapping or the single-expert gold standard distorts the comparison, the conclusion that small models beat large ones at low-level concepts falls apart.
Editorial extensions
If this is right
- For tasks requiring fine-grained biomedical concept detection, domain-specific pre-trained models such as PubMedBERT merit serious consideration over large language models, despite the current shift toward LLM usage.
- The 57% Tier-III hallucination rate shows that providing an explicit label list does not keep an LLM constrained; applications needing low-level labels must validate outputs against the allowed label set.
- Both model pools showed low agreement with the expert oncologist, so neither class of models is yet a reliable stand-in for expert annotation in this task.
- The opposite trends across tiers suggest that the choice of model family should be guided by the desired conceptual granularity, not by model size alone.
Reading between the lines
- If the pattern generalizes, the most promising architecture is a hybrid: a domain-specialized encoder that proposes fine-grained terms and a large model that reasons over them to decide high-level categories.
- The single-expert gold standard likely understates the human-disagreement baseline; a multi-annotator Tier-II/III benchmark could reveal whether the reported SLM advantage reflects reproducibility or partly one clinician's labeling style.
- A testable extension is to evaluate LLMs under constrained decoding or with a verification step that forces outputs into the list; if hallucinations drop and low-level F1 rises, the paper's low-level LLM deficit may be partly a decoding artifact rather than a conceptual-grounding gap.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces ImmunoFOMO, a study of whether small pre-trained language models (PLMs: BioBERT, SciBERT, PubmedBERT, ClinicalBERT, ClinicalBigBird) and large language models (LLMs: Llama-3-8B, Gemma-2-9B, Med-Qwen, DeepSeek-R1, BioMistral) can identify hallmarks of immunotherapy in breast cancer abstracts at three levels of conceptual granularity (Tier-I: 9 hallmarks; Tier-II: 27 subcategories; Tier-III: 177 keywords). A single oncologist annotated each of 188 abstracts with two Tier-I labels, and models were evaluated in an unsupervised setting: SLMs via similarity-based classification and LLMs via zero-shot prompting. The paper reports F1 scores and agreement metrics, and its central claim is that SLMs outperform LLMs on low-level (Tier-III) concepts while LLMs are better at high-level (Tier-I/II) concepts. The authors also report hallucination rates for LLMs and intra-model-pool agreement.
Significance. If the central claim were established, the paper would be a valuable contribution to biomedical NLP: it would provide a concrete benchmark for conceptual grounding across model families and a structured taxonomy of immunotherapy hallmarks. The paper curates a new dataset and a three-tier taxonomy, evaluates ten models, and includes a candid limitations section. It is also notable for reporting that SLMs produce no hallucinated labels in this setting. However, as detailed in the major comments, the evaluation design does not currently support the headline claim about low-level concept identification, because Tier-II/III performance is measured only after aggregation to Tier-I labels and against Tier-I gold. With appropriate additional validation or re-annotation, the study could become a useful reference for model selection in biomedical concept extraction.
major comments (5)
- [Section 3, footnote 1; Tables 3-4] The Tier-II and Tier-III F1 scores are computed by mapping model predictions to Tier-I labels and comparing against Tier-I gold, not by scoring against Tier-II/III gold. This aggregation cannot support the claim that SLMs are better at low-level concepts. With 177 Tier-III labels collapsed into 9 buckets, a model that hits the correct Tier-I bucket but the wrong specific concept is counted as correct; the PubmedBERT increase from 0.33 (Tier-I) to 0.50 (Tier-III) in Table 4 is exactly the kind of artifact this design permits. The Limitations section explicitly concedes the absence of Tier-II/III expert annotations. The central claim requires per-tier gold labels, or at minimum a validated aggregation mapping with chance-level baselines.
- [Section B and Figure 4] The LLM protocol asks each model to return the 'top three suited categories', while the SLM protocol selects a single most similar label. This asymmetry in prediction-set size biases the comparison in favor of LLMs on recall and inflates their F1 at every tier. The paper does not control for the number of allowed predictions or report matched-condition results, yet the comparison between pools is a central contribution.
- [Tables 3-4 and Section 4] All F1 scores are point estimates on a single dataset of 188 abstracts, with no confidence intervals, bootstrap resampling, or significance tests. The headline differences, such as PubmedBERT 0.50 versus Gemma-2-9B 0.38 at Tier-III overall, are small relative to the expected variance given the very low agreement values in Table 2. It is therefore not established that these differences are stable or meaningful.
- [Section 3, Expert Annotations] The gold standard is a single expert's Tier-I annotations, with no inter-annotator reliability assessment. The Limitations section itself notes that human annotators often disagree, which makes the absence of a reliability check for the gold standard a substantive problem: all F1 scores and agreement metrics are relative to an unvalidated reference.
- [Section B, Reproducibility] LLM raw outputs are post-processed with GPT-3.5-turbo to extract predictions, but the paper does not evaluate the fidelity of this extraction step. If GPT-3.5 alters, drops, or adds labels, the resulting F1 scores reflect the post-processing model as much as the LLMs under test, and the comparison is no longer clean.
minor comments (6)
- [Section 2] The sentence 'we access language models for identification' should read 'we assess language models for identification'.
- [Table 2] The text 'Cκ between 0.9 - 0.17' appears to be a typo for '0.09-0.17', given the values in the table.
- [Table 3] The row label 'DeepSeek-R10.50 0.410.18' is malformed; it should read 'DeepSeek-R1 0.50 0.41 0.18'.
- [Abstract and Section 5] The abstract and conclusion state that 'pre-trained language models have potential to outperform large language models' at low-level concepts, but the results show only PubmedBERT clearly doing so; other SLMs are not consistently better than the best LLM at Tier-III.
- [Figure 2] The pooled trends would be easier to interpret with individual model points or error bars; the current dashed lines aggregate over models with very different scores.
- [Section 5, Hallucinations] The paper reports hallucination percentages but does not quantify how hallucinations affect precision or F1 separately, so the claim that hallucinations 'lead to lower precision' is not directly tested.
Circularity Check
No significant circularity: the central comparison is an external benchmark with human gold labels; the lower-tier aggregation is a stated evaluation limitation, not a circular derivation.
full rationale
The paper does not derive its central claim from an input by construction. The hallmark hierarchy (9 Tier-I, 27 Tier-II, 177 Tier-III labels) is curated from literature and clinical experience, and the gold standard is provided by a clinical expert as two Tier-I labels per abstract. Model predictions are produced independently: PLMs use similarity-based classification and LLMs use zero-shot prompting. No parameter is fitted to the expert labels, no uniqueness theorem from the authors is invoked, and no prior result by the same authors is load-bearing. The only design point that could look circular is the scoring of Tier-II/Tier-III predictions: as the Section 3 footnote states, 'we converted the lower-level labels (Tier-II or III) to Tier-I based on the aggregation criteria provided in the hallmark list.' This means reported Tier-III F1 scores measure whether a selected low-level keyword falls in the same Tier-I bucket as the expert's high-level label, so the headline claim that SLMs are better at low-level concepts is not fully supported by a direct low-level gold standard. However, this is an evaluation-validity limitation, explicitly conceded in the Limitations section ('One of the limitation of this study is the lack of expert annotation at tier-II and tier-III'), rather than a circularity: the predictions are not defined in terms of the target labels, and the conversion is disclosed instead of hidden. Under the stated rules, methodological weakness belongs to correctness risk, not circularity. Therefore no circular step is identified.
Assumptions & free parameters
assumptions (5)
- domain assumption The single clinical expert's Tier-I annotations are a reliable gold standard for conceptual grounding.
- domain assumption Converting Tier-II/Tier-III predictions to Tier-I via the curated hallmark hierarchy preserves the meaning of the task.
- domain assumption Similarity-based classification with sentence embeddings is a valid zero-shot conceptual grounding test for PLMs.
- domain assumption Zero-shot prompting of LLMs with only the label list and abstract is a representative evaluation of their conceptual grounding.
- domain assumption The curated hallmark taxonomy (9/27/177 labels) is a faithful operationalization of hallmarks of immunotherapy in breast cancer.
Cite this review
Pith. "Pith review of ImmunoFOMO: Are Language Models missing what oncologists see?." pith.science (2026). https://pith.science/paper/6MHIP3F5
@misc{pith2026250611478,
author = {Pith},
title = {Pith review of: ImmunoFOMO: Are Language Models missing what oncologists see?},
year = {2026},
howpublished = {\url{https://pith.science/paper/6MHIP3F5}},
note = {Machine review of arXiv:2506.11478}
}
read the original abstract
Language models (LMs) capabilities have grown with a fast pace over the past decade leading researchers in various disciplines, such as biomedical research, to increasingly explore the utility of LMs in their day-to-day applications. Domain specific language models have already been in use for biomedical natural language processing (NLP) applications. Recently however, the interest has grown towards medical language models and their understanding capabilities. In this paper, we investigate the medical conceptual grounding of various language models against expert clinicians for identification of hallmarks of immunotherapy in breast cancer abstracts. Our results show that pre-trained language models have potential to outperform large language models in identifying very specific (low-level) concepts.
Figures
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Works this paper leans on
-
[1]
online" 'onlinestring :=
ENTRY address archivePrefix author booktitle chapter edition editor eid eprint eprinttype howpublished institution journal key month note number organization pages publisher school series title type volume year doi pubmed url lastchecked label extra.label sort.label short.list INTEGERS output.state before.all mid.sentence after.sentence after.block STRING...
-
[2]
write newline
" write newline "" before.all 'output.state := FUNCTION n.dashify 't := "" t empty not t #1 #1 substring "-" = t #1 #2 substring "--" = not "--" * t #2 global.max substring 't := t #1 #1 substring "-" = "-" * t #2 global.max substring 't := while if t #1 #1 substring * t #2 global.max substring 't := if while FUNCTION word.in bbl.in capitalize " " * FUNCT...
-
[3]
AI@Meta. 2024. https://github.com/meta-llama/llama3/blob/main/MODEL_CARD.md Llama 3 model card
2024
-
[4]
Jinze Bai, Shuai Bai, Yunfei Chu, Zeyu Cui, Kai Dang, Xiaodong Deng, Yang Fan, Wenbin Ge, Yu Han, Fei Huang, Binyuan Hui, Luo Ji, Mei Li, Junyang Lin, Runji Lin, Dayiheng Liu, Gao Liu, Chengqiang Lu, Keming Lu, and 29 others. 2023. Qwen technical report. arXiv preprint arXiv:2309.16609
arXiv 2023
-
[5]
Simon Baker and Anna Korhonen. 2017. Initializing neural networks for hierarchical multi-label text classification. Association for Computational Linguistics
work page 2017
-
[6]
Simon Baker, Anna Korhonen, and Sampo Pyysalo. 2017. Cancer hallmark text classification using convolutional neural networks
work page 2017
-
[7]
Iz Beltagy, Kyle Lo, and Arman Cohan. 2019. https://arxiv.org/abs/arXiv:1903.10676 Scibert: Pretrained language model for scientific text . In EMNLP
arXiv 2019
-
[8]
Catherine Blake. 2010. https://doi.org/10.1016/j.jbi.2009.11.001 Beyond genes, proteins, and abstracts: Identifying scientific claims from full-text biomedical articles . Journal of Biomedical Informatics, 43(2):173--189
Show all 35 references
-
[9]
Tom Brown, Benjamin Mann, Nick Ryder, Melanie Subbiah, Jared D Kaplan, Prafulla Dhariwal, Arvind Neelakantan, Pranav Shyam, Girish Sastry, Amanda Askell, and 1 others. 2020. Language models are few-shot learners. Advances in neural information processing systems, 33:1877--1901
2020
-
[10]
Alexandria P Cogdill, Miles C Andrews, and Jennifer A Wargo. 2017. Hallmarks of response to immune checkpoint blockade. British journal of cancer, 117(1):1--7
2017
-
[11]
DeepSeek-AI. 2025. https://arxiv.org/abs/2501.12948 Deepseek-r1: Incentivizing reasoning capability in llms via reinforcement learning . Preprint, arXiv:2501.12948
2025 arXiv
-
[12]
Pieter Fivez, Simon Suster, and Walter Daelemans. 2021. Conceptual grounding constraints for truly robust biomedical name representations. In Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics, pages 2440--2450
2021
-
[13]
Dobbins, Namu Park, Michael Leu, Abby R
Yujuan Fu, Giridhar Kaushik Ramachandran, Nicholas J. Dobbins, Namu Park, Michael Leu, Abby R. Rosenberg, Kevin Lybarger, Fei Xia, Ozlem Uzuner, and Meliha Yetisgen. 2024. https://api.semanticscholar.org/CorpusID:268820219 Extracting social determinants of health from pediatri...
2024 arXiv
-
[14]
Alessandra Gennari, Fabrice Andr \'e , CH Barrios, Javier Cortes, Evandro de Azambuja, Angela DeMichele, R Dent, Deborah Fenlon, Joseph Gligorov, SA Hurvitz, and 1 others. 2021. Esmo clinical practice guideline for the diagnosis, staging and treatment of patients with metastat...
2021
-
[15]
Yu Gu, Robert Tinn, Hao Cheng, Michael Lucas, Naoto Usuyama, Xiaodong Liu, Tristan Naumann, Jianfeng Gao, and Hoifung Poon. 2021. Domain-specific language model pretraining for biomedical natural language processing. ACM Transactions on Computing for Healthcare (HEALTH), 3(1):1--23
2021
-
[16]
Douglas Hanahan and Robert A Weinberg. 2000. The hallmarks of cancer. cell, 100(1):57--70
2000
-
[17]
Maria Karasarides, Alexandria P Cogdill, Paul B Robbins, Michaela Bowden, Elizabeth M Burton, Lisa H Butterfield, Alessandra Cesano, Christian Hammer, Cara L Haymaker, Christine E Horak, and 1 others. 2022. Hallmarks of resistance to immune-checkpoint inhibitors. Cancer immuno...
2022
-
[18]
Mehrdad Khatir and Chandan K Reddy. 2024. Concept formation and alignment in language models: Bridging statistical patterns in latent space to concept taxonomy. arXiv preprint arXiv:2406.05315
2024 arXiv
-
[19]
Yanis Labrak, Adrien Bazoge, Emmanuel Morin, Pierre-Antoine Gourraud, Mickael Rouvier, and Richard Dufour. 2024. https://arxiv.org/abs/2402.10373 Biomistral: A collection of open-source pretrained large language models for medical domains . Preprint, arXiv:2402.10373
2024 arXiv
-
[20]
Jinhyuk Lee, Wonjin Yoon, Sungdong Kim, Donghyeon Kim, Sunkyu Kim, Chan Ho So, and Jaewoo Kang. 2020. Biobert: a pre-trained biomedical language representation model for biomedical text mining. Bioinformatics, 36(4):1234--1240
2020
-
[21]
Patrick Lewis, Myle Ott, Jingfei Du, and Veselin Stoyanov. 2020. https://doi.org/10.18653/v1/2020.clinicalnlp-1.17 Pretrained language models for biomedical and clinical tasks: Understanding and extending the state-of-the-art . In Proceedings of the 3rd Clinical Natural Langua...
2020 doi
-
[22]
Yikuan Li, Ramsey M Wehbe, Faraz S Ahmad, Hanyin Wang, and Yuan Luo. 2022. Clinical-longformer and clinical-bigbird: Transformers for long clinical sequences. arXiv preprint arXiv:2201.11838
2022 arXiv
-
[23]
Fenglin Liu, Zheng Li, Hongjian Zhou, Qingyu Yin, Jingfeng Yang, Xianfeng Tang, Chen Luo, Ming Zeng, Haoming Jiang, Yifan Gao, Priyanka Nigam, Sreyashi Nag, Bing Yin, Yining Hua, Xuan Zhou, Omid Rohanian, Anshul Thakur, Lei Clifton, and David A. Clifton. 2024. https://arxiv.or...
2024 arXiv
-
[24]
Sibylle Loibl, F Andr \'e , T Bachelot, CH Barrios, J Bergh, HJ Burstein, MJ Cardoso, LA Carey, S Dawood, L Del Mastro, and 1 others. 2024. Early breast cancer: Esmo clinical practice guideline for diagnosis, treatment and follow-up. Annals of Oncology, 35(2):159--182
2024
-
[25]
Renqian Luo, Liai Sun, Yingce Xia, Tao Qin, Sheng Zhang, Hoifung Poon, and Tie-Yan Liu. 2022. https://doi.org/10.1093/bib/bbac409 BioGPT: generative pre-trained transformer for biomedical text generation and mining . Briefings in Bioinformatics, 23(6). Bbac409
2022 doi
-
[26]
Golnaz Morad, Beth A Helmink, Padmanee Sharma, and Jennifer A Wargo. 2021. Hallmarks of response, resistance, and toxicity to immune checkpoint blockade. Cell, 184(21):5309--5337
2021
-
[27]
Hambly, Zoe Triplett, Nahyan Asif, Anindya Susanto, Anamika Chowdhury, Amaya Azcoaga Lorenzo, Mark Dras, and Shlomo Berkovsky
David Fraile Navarro, Enrico Coiera, Thomas W. Hambly, Zoe Triplett, Nahyan Asif, Anindya Susanto, Anamika Chowdhury, Amaya Azcoaga Lorenzo, Mark Dras, and Shlomo Berkovsky. 2025. https://api.semanticscholar.org/CorpusID:275385218 Expert evaluation of large language models for...
2025
-
[28]
Tim Schopf, Daniel Braun, and Florian Matthes. 2022. https://doi.org/10.1145/3582768.3582795 Evaluating unsupervised text classification: Zero-shot and similarity-based approaches . In Proceedings of the 2022 6th International Conference on Natural Language Processing and Info...
2022
-
[29]
Yangqiu Song and Dan Roth. 2014. On dataless hierarchical text classification. In Proceedings of the AAAI conference on artificial intelligence, volume 28
2014
-
[30]
Yansen Su, Minglu Wang, Pengpeng Wang, Chunhou Zheng, Yuansheng Liu, and Xiangxiang Zeng. 2022. https://doi.org/10.1093/bib/bbac342 Deep learning joint models for extracting entities and relations in biomedical: a survey and comparison . Briefings in Bioinformatics, 23(6):bbac342
2022 doi
-
[31]
Gemma Team, Thomas Mesnard, Cassidy Hardin, Robert Dadashi, Surya Bhupatiraju, Shreya Pathak, Laurent Sifre, Morgane Rivi \`e re, Mihir Sanjay Kale, Juliette Love, and 1 others. 2024. Gemma: Open models based on gemini research and technology. arXiv preprint arXiv:2403.08295
2024 arXiv
-
[32]
Sappadla Prateek Veeranna, Jinseok Nam, Eneldo Loza Menc a, and Johannes F \"u rnkranz. 2016. Using semantic similarity for multi-label zero-shot classification of text documents. In Proceeding of european symposium on artificial neural networks, computational intelligence and...
2016
-
[33]
Workum, Bas W
Jessica D. Workum, Bas W. S. Volkers, Davy van de Sande, Sumesh Arora, Marco Goeijenbier, Diederik A.M.P.J. Gommers, and Michel E. van Genderen. 2025. https://api.semanticscholar.org/CorpusID:276255602 Comparative evaluation and performance of large language models on expert l...
2025
-
[34]
Lawrence K. Q. Yan, Qian Niu, Ming Li, Yichao Zhang, Caitlyn Heqi Yin, Cheng Fei, Benji Peng, Ziqian Bi, Pohsun Feng, Keyu Chen, Tianyang Wang, Yunze Wang, Silin Chen, Ming Liu, and Junyu Liu. 2024. https://arxiv.org/abs/2410.21348 Large language model benchmarks in medical ta...
2024
-
[35]
Xinlu Zhang, Chenxin Tian, Xianjun Yang, Lichang Chen, Zekun Li, and Linda Ruth Petzold. 2023. https://arxiv.org/abs/2310.14558 Alpacare:instruction-tuned large language models for medical application . Preprint, arXiv:2310.14558
2023 arXiv
Reviewed August 7, 2026 · model on record in the stance chip above.
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