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Leyfman, Yan

https://orcid.org/0000-0002-9331-1857

Mayo Clinic

NewYork–Presbyterian Hospital

Citations 5

Evaluation Frameworks for Predictive and Generative Oncology AI: Current Standards, Cancer-Specific Gaps, and a Path Toward Clinical Use
Yost, Connor D., Callas, Bradley, Halligan, Peter, Palumbo, Peter, Rawal, Samarth, Leyfman, Yan , Yost, Connor , Leyfman, Yan , Yost, Connor , Halligan, Peter, Rawal, Samarth, Nguyen, Ryan H.

Cancers | June 18, 2026 | Volume: 18 | Issue: 12 | Pages: 1981

10.3390/cancers18121981 Get It

Artificial intelligence (AI) is now applied across oncology, including imaging, pathology, therapy selection, toxicity assessment, and survival modeling, and large language models (LLMs) have been adopted particularly quickly. Reported physician use of AI roughly doubled between 2023 and 2026. The frameworks used to evaluate these tools have not advanced at the same rate. Many are available, but each was designed for a single stage of the AI lifecycle, and none directly answers the question most relevant to a treating clinician: whether a given tool is appropriate for the individual patient under care. We reviewed the frameworks in current use, including TRIPOD+AI, PROBAST+AI, CLAIM, SPIRIT-AI, CONSORT-AI, DECIDE-AI, MINIMAR, and CREMLS, together with the oncology-specific ESMO EBAI and the newer LLM-specific guidance (TRIPOD-LLM, MI-CLEAR-LLM, CHART, and ESMO ELCAP). Each addresses part of the evaluation problem, but none is sufficient on its own for oncology, where the standard of care changes rapidly, assays drift, biomarker-defined subgroups are small, and a model validated in one period may perform poorly in the next. LLMs introduce additional challenges, including sensitivity to prompting, undisclosed vendor updates, behavioral drift, and hallucination rates approaching 50% on clinical quality-assurance tasks. The predictive-model frameworks were not designed to capture these failure modes. The central argument of this review is that the frameworks the field requires already exist; what is missing is their mandatory adoption. We propose that journals and regulators move from recommending these frameworks to requiring their use, and we outline a cancer-aware evaluation pathway together with the specific responsibilities of authors, reviewers, journals, and regulators in implementing it.
Retrieval-Augmented GPT-4 Improves NCCN-Concordant Lymphoma Treatment Recommendations
Yost, Connor , Monick, Sarah, Tripathi, Nikita , Palumbo, Peter, Kumar, Yash, Ertz-Archambault, Natalie , Galamaga, Robert , Yost, Connor , Loaiza‐Bonilla, Arturo , Palumbo, Peter, Leyfman, Yan , Kumar, Yash

Blood | December 4, 2025 | Volume: 146 | Issue: Supplement 1 | Pages: 7914-7914

10.1182/blood-2025-7914 Get It

Abstract While the use of NCCN guidelines is essential in lymphoma care, adherence among oncologists remains highly variable. Real-world concordance ranges from 65–80% overall, dropping to as low as 11–46% for certain lymphoma subtypes. Although 88% of clinicians report using NCCN guidelines for Hodgkin lymphoma, adherence to PET-adapted approaches is inconsistent. This gap highlights a critical need for tools that support guideline-concordant care.Large language models (LLMs) such as GPT–4 promise decision support, yet hallucinations and divergence from evidence-based care remain obstacles. We assessed whether retrieval-augmented generation (RAG) with National Comprehensive Cancer Network (NCCN) guidelines improves GPT–4 performance in lymphoma treatment recommendation tasks. To address this, we developed a RAG-enhanced GPT-4 agent (RAG-GPT) by indexing the 2025 NCCN Lymphoma Guidelines into a vector database. Fifty clinical vignettes spanning diverse lymphoma subtypes were compiled from published case reports; this sample provides 80 % power (α = 0.05) to detect a mean score difference of ≥ 0.18 on the modified Generative AI Performance Score (mG-PS). Guideline concordance was assessed based on NCCN guidelines and clinical judgment reflecting real-world oncological decision-making. Scores were normalized between -1.0 and 1.0 for consistent evaluation. Readability and rationale clarity were rated on a 5-point Likert scale. Baseline GPT-4 and RAG-GPT generated treatment plans via standardized prompts. An oncologist scored all outputs with mG-PS, which rates NCCN concordance (0.0–1.0) and penalizes hallucinations (-0.25 to –1.0). RAG-GPT achieved a higher mean mG-PS (0.32) than baseline GPT–4 (0.10) (t(98)=-2.11, p=0.038; mean score difference ΔmG-PS=0.22). Importantly, RAG-GPT eliminated severe hallucinations, reinforcing confidence in the safety of its treatment reccomendations. Fully concordant “gold-standard” plans were produced in 46 % of vignettes with RAG-GPT versus 22 % with baseline. Readability scores favored RAG-GPT modestly without statistical significance. Lymphoma's bimodal age distribution, heterogeneity, and lack of standardized treatment algorithms, coupled with regimen toxicity and the need to account for patient frailty and comorbidities, create complex clinical scenarios that constrain LLM applicability for nuanced decision-making. Non-Hodgkin lymphoma, particularly relapsed/refractory, transformed disease, or rare subtypes, lacks a defined standard of care, leading reviewers to rely on clinical judgment or published case series beyond NCCN guidelines. This underscores a key limitation of LLM-supported tools: their performance is highly dependent on the presence of clear algorithmic consensus within a given disease. Linking GPT-4 to NCCN guidelines via RAG significantly improved treatment accuracy and reduced hallucination severity in lymphoma, though performance remained lower than prior RAG studies in cancers like breast and CNS suggesting a greater impact on hallucination reduction than on retrieval of a consistent gold standard regimen. These findings support continued development and prospective validation of guideline-anchored LLMs for clinical use.
Professional Challenges for United States Hematology/Oncology Trainees during COVID-19
Banerjee, Rahul , Kareff, Samuel A. , Leyfman, Yan , Dhawan, Natasha , Hammons, Lindsay , Desai, Aakash , Velázquez, Ana I. , Nizam, Amanda , Velazquez, Ana I , Desai, Aakash P , Leyfman, Yan , Banerjee, Rahul , Tsang, Mazie

Cancer Investigation | April 5, 2023 | Volume: 41 | Issue: 6 | Pages: 539-547

10.1080/07357907.2023.2199216 Get It

Social Media and Professional Development for Oncology Professionals
Chidharla, Anusha , Attai, Deanna J. , Drake, Emily K. , Londen, G. J. van , Subbiah, Ishwaria M. , Henry, Elizabeth , Murphy, Martina, Barry, Maura , Manochakian, Rami , Leyfman, Yan , Utengen, Audun , Attai, Deanna J , Drake, Emily K , van Londen, G J , Subbiah, Ishwaria M , Henry, Elizabeth , Barry, Maura M , Manochakian, Rami , Moerdler, Scott , Loeb, Stacy , Graff, Stephanie L , Leyfman, Yan , Thompson, Michael A , Markham, Merry J , Utengen, Audun , Loeb, Stacy , Graff, Stephanie L. , Thompson, Michael A, Markham, Merry Jennifer

JCO Oncology Practice | March 21, 2022 | Volume: 18 | Issue: 8 | Pages: 566-571

10.1200/op.21.00761 Get It

The use of social media continues to increase in health care and academia. Health care practice, particularly the oncologic field, is constantly changing because of new knowledge, evidence-based research, clinical trials, and government policies. Therefore, oncology trainees and professionals continue to strive to stay up-to-date with practice guidelines, research, and skills. Although social media as an educational and professional development tool is no longer completely new to medicine and has been embraced, it is still under-researched in terms of various outcomes. Social media plays several key roles in professional development and academic advancement. We reviewed the literature to evaluate how social media can be used for professional development and academic promotion of oncology professionals.
Opportunities and Challenges of Observational Studies and Randomized Controlled Trials for Evaluating the Therapeutic Efficacy of COVID-19 Convalescent Plasma
Desai, Aakash , Leyfman, Yan , Kuderer, Nicole M. , Desai, Aakash P , Leyfman, Yan , Lyman, Gary H

Cancer Investigation | June 17, 2021 | Volume: 39 | Issue: 6-7 | Pages: 449-456

10.1080/07357907.2021.1942127 Get It