News
Media
Conferences
Events
Partners
Publications
Resources
Biomarker Consortium
Subscribe

Your AI-Trained Oncology Knowledge Connection!

Opinion|Videos|January 26, 2026

Limitations of Conventional Immunohistochemistry for TROP2 Assessment

Author(s)Benjamin P. Levy, MD, David L. Rimm, MD, PhD

Exploring the complexities of Trop-2 expression in cancer, this discussion highlights challenges in measurement and its implications for treatment efficacy.

Episodes in this series

EP. 1 The Role of TROP2 in Non-Small Cell Lung Cancer

EP. 1 The Role of TROP2 in Non-Small Cell Lung Cancer

EP. 2 Limitations of Conventional Immunohistochemistry for TROP2 Assessment

EP. 2 Limitations of Conventional Immunohistochemistry for TROP2 Assessment

EP. 3 Quantitative Continuous Scoring as an Approach to TROP2 Measurement

EP. 3 Quantitative Continuous Scoring as an Approach to TROP2 Measurement

EP. 4 Clinical Insights From the TROPION Lung Studies

EP. 4 Clinical Insights From the TROPION Lung Studies

EP. 5 Future Directions for Validating TROP2 Biomarkers in Lung Cancer

EP. 5 Future Directions for Validating TROP2 Biomarkers in Lung Cancer

Drs. Levy and Rimm focus on how TROP2 is currently assessed in clinical practice and the limitations of relying on conventional immunohistochemistry with manual scoring. Dr. Rimm explains how subjective interpretation, inter-institutional variability, and lack of standardization complicate the assessment of TROP2 expression, particularly at lower levels. The discussion highlights why high expression is generally easier to recognize, while distinguishing between low expression and true negativity remains challenging. Dr. Levy connects these technical limitations to clinical outcomes, noting that TROP2 immunohistochemistry has not reliably predicted response to TROP2-directed antibody drug conjugates in lung cancer trials. Together, they explain why conventional scoring approaches may fail to provide oncologists with consistent, actionable information and why more quantitative and reproducible methods are needed to support biomarker-driven treatment decisions.

Newsletter

Stay up to date on the most recent and practice-changing oncology data

Related Content

Latest CME

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | Arkansas

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | Arkansas

Erminia Massarelli, MD, PhD, MS; Parth Khade, MD

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | Tennessee

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | Tennessee

Misty D. Shields, MD, PhD; Chandler Park, MD, MSc, FACP

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | South Carolina

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | South Carolina

Misty D. Shields, MD, PhD; Rujul Parikh, MD

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | Kansas

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | Kansas

Charu Aggarwal, MD, MPH, FASCO; Yifan Tu, MD, PhD

Community Oncology Connections™: Beyond Primary End Points—Digging Into Randomized and Real-World Data to Guide Challenging Treatment Decisions in HR+/HER2− Metastatic Breast Cancer | Washington State Medical Oncology Society

Community Oncology Connections™: Beyond Primary End Points—Digging Into Randomized and Real-World Data to Guide Challenging Treatment Decisions in HR+/HER2− Metastatic Breast Cancer | Washington State Medical Oncology Society

Marla D. Lipsyc-Sharf, MD; Ashley Frith, MD

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | Wyoming and Montana

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | Wyoming and Montana

Charu Aggarwal, MD, MPH, FASCO; Mo Ziari, MD

Medical Crossfire®: Integrating Next-Generation Endocrine Targeting Therapies to Improve Outcomes for Patients With HR+/HER2- Breast Cancer

Medical Crossfire®: Integrating Next-Generation Endocrine Targeting Therapies to Improve Outcomes for Patients With HR+/HER2- Breast Cancer

William J. Gradishar, MD, FASCO, FACP; Laura Huppert, MD; Yuan Yuan, MD, PhD

PER Tumor Board®: Applying Recent Advances to Transform the Treatment Paradigm in SCLC—Expert Perspectives on New Approvals and Emerging Strategies

PER Tumor Board®: Applying Recent Advances to Transform the Treatment Paradigm in SCLC—Expert Perspectives on New Approvals and Emerging Strategies

Jonathan W. Goldman, MD; Percy Lee, MD, FASTRO; Erminia Massarelli, MD, PhD, MS; Misty D. Shields, MD, PhD

Medical Crossfire®: Improving Patient Outcomes in Myeloproliferative Neoplasms With Novel Therapeutic Approaches

Medical Crossfire®: Improving Patient Outcomes in Myeloproliferative Neoplasms With Novel Therapeutic Approaches

Rami Komrokji, MD; Gabriela Hobbs, MD; John Mascarenhas, MD; Naveen Pemmaraju, MD

Tumor Board: Expert Insights on Managing Classical 𝘌𝘎𝘍𝘙 Mutations, 𝘌𝘎𝘍𝘙 Exon 20 Insertions, and Atypical 𝘌𝘎𝘍𝘙 Mutations in Metastatic NSCLC

Tumor Board: Expert Insights on Managing Classical 𝘌𝘎𝘍𝘙 Mutations, 𝘌𝘎𝘍𝘙 Exon 20 Insertions, and Atypical 𝘌𝘎𝘍𝘙 Mutations in Metastatic NSCLC

Balazs Halmos, MD, MS; Enriqueta Felip, MD, PhD; Julia Rotow, MD

Medical Crossfire®: Precision Medicine in Glioma Treatment — Integration of Molecular Profiling to Inform Targeted Therapies

Medical Crossfire®: Precision Medicine in Glioma Treatment — Integration of Molecular Profiling to Inform Targeted Therapies

Vinay K. Puduvalli, MD; Manmeet Ahluwalia, MD, MBA; Stephen J. Bagley, MD, MSCE; Angela Waanders, MD, MPH, MS

Medical Crossfire®: Bridging Evidence to Practice in AML…Updates on FLT3, IDH1/2, Maintenance, Combos, and Clinical Trials

Medical Crossfire®: Bridging Evidence to Practice in AML…Updates on FLT3, IDH1/2, Maintenance, Combos, and Clinical Trials

Naval G. Daver, MD; Jessica Altman, MD; Amir T. Fathi, MD; Gail J. Roboz, MD; Joshua Zeidner, MD

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | New Mexico

Personalized Management in NSCLC: Strategies for Early Detection, Molecular Testing, and Targeted Therapies | New Mexico

Zofia Piotrowska, MD, MHS; Shan Guo, MD

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | North Carolina

Community Oncology Connections™: Optimizing SCLC Treatment Strategies and Managing Adverse Events Across Disease Stages | North Carolina

Misty D. Shields, MD, PhD; Michelle Ojemuyiwa, MD

Live Tumor Board: Squamous Cell Carcinoma of the Head & Neck – Post-CRT Decisions in the Locally Advanced Setting

In-Person + Virtual Event

Live Tumor Board: Squamous Cell Carcinoma of the Head & Neck – Post-CRT Decisions in the Locally Advanced Setting

February 19, 2026

A Breath of Strength: Managing Cancer Associated LEMS and Lung Cancer as One

A Breath of Strength: Managing Cancer Associated LEMS and Lung Cancer as One

Estelamari Rodriguez, MD, MPH; Millie Das, MD; Ruham Nasany, MD

Show Me the Data™: Bridging Clinical Gaps Along the Continuum From Resectable, Early Stage to Advanced Gastric/Gastroesophageal Junction Cancers

Show Me the Data™: Bridging Clinical Gaps Along the Continuum From Resectable, Early Stage to Advanced Gastric/Gastroesophageal Junction Cancers

Zev A. Wainberg, MD; Manish A. Shah, MD, FASCO; Syma Iqbal, MD

Striking the Right Nerve: Managing Cancer Associated LEMS in Lung Cancer Patients

Striking the Right Nerve: Managing Cancer Associated LEMS in Lung Cancer Patients

Anne Chiang, MD, PhD; J. Douglas Miles, MD, PhD, FAAN; Suma Satti, MD

19th Annual New York GU Cancers Congress™

In-Person Event

19th Annual New York GU Cancers Congress™

March 13-14, 2026

Medical Crossfire®: Expert Interpretations of the Latest Data in CLL Management – Understanding the Impact of Optimal Treatment Selection on Patient Outcomes

Medical Crossfire®: Expert Interpretations of the Latest Data in CLL Management – Understanding the Impact of Optimal Treatment Selection on Patient Outcomes

Jennifer R. Brown, MD, PhD; Alexey V. Danilov, MD, PhD; Matthew S. Davids, MD, MMSc

Virtual Testing Board: Digging Deeper on Your Testing Reports to Elevate Patient Outcomes in Advanced Non–Small Cell Lung Cancer

Virtual Testing Board: Digging Deeper on Your Testing Reports to Elevate Patient Outcomes in Advanced Non–Small Cell Lung Cancer

Stephen V. Liu, MD; Michelle Afkhami, MD; Ignacio I. Wistuba, MD; Helena Yu, MD

Medical Crossfire® – From Diagnostic Dilemmas to Potential Treatment Breakthroughs: Exploring Novel Targets for Extrapulmonary Neuroendocrine Carcinomas

In-Person + Virtual Event

Medical Crossfire® – From Diagnostic Dilemmas to Potential Treatment Breakthroughs: Exploring Novel Targets for Extrapulmonary Neuroendocrine Carcinomas

March 24, 2026

Addressing Unmet Needs in HER2+ Metastatic BTC

Addressing Unmet Needs in HER2+ Metastatic BTC

Rahul Gosain, MD, MBA; Rohit Gosain, MD; Ghassan Abou-Alfa, MD, MBA

Community Practice Connections™: Tailored Treatment Approaches for Older Patients With Advanced HR+/HER2– Breast Cancer

Community Practice Connections™: Tailored Treatment Approaches for Older Patients With Advanced HR+/HER2– Breast Cancer

Hope S. Rugo, MD, FASCO; Neil M. Iyengar, MD; Komal Jhaveri, MD, FACP

Community Practice Connections™: Optimizing Treatment Outcomes and Preserving Fertility in Premenopausal HR+ Breast Cancer

Community Practice Connections™: Optimizing Treatment Outcomes and Preserving Fertility in Premenopausal HR+ Breast Cancer

Rebecca Shatsky, MD; Kelly McCann, MD, PhD; Michelle L. Taylor, ANP-BC

From Bench to Bedside: Paradigm Shifts in HER2+ Metastatic BTC Treatment

From Bench to Bedside: Paradigm Shifts in HER2+ Metastatic BTC Treatment

Rahul Gosain, MD, MBA; Rohit Gosain, MD; Shubham Pant, MD, MBBS

Proactive Adverse Event Management for HER2+ BTC Treatments

Proactive Adverse Event Management for HER2+ BTC Treatments

Rahul Gosain, MD, MBA; Rohit Gosain, MD; Rachna T. Shroff, MD, MS, FASCO

Community Practice Connections™: Empowering Interventional Radiologists in the Emerging Era of Oncolytic Immunotherapies for Melanoma

Community Practice Connections™: Empowering Interventional Radiologists in the Emerging Era of Oncolytic Immunotherapies for Melanoma

Yana G. Najjar, MD; Douglas B. Johnson, MD, MSCI; Rahul A. Sheth, MD, FSIR

A Case-Guided Discussion on Managing Immune Thrombocytopenic Purpura (ITP)

A Case-Guided Discussion on Managing Immune Thrombocytopenic Purpura (ITP)

Cindy Neunert, MD, MSCS; Hanny Al-Samkari, MD; Joseph Shatzel, MD, MCR

Medical Crossfire®: Harnessing the Power of Modern Therapies in Newly Diagnosed Multiple Myeloma

Medical Crossfire®: Harnessing the Power of Modern Therapies in Newly Diagnosed Multiple Myeloma

C. Ola Landgren, MD, PhD; Mohamad Mohty, MD, PhD; Surbhi Sidana, MD

Medical Crossfire®: Expert Perspectives on Targeting c-Met Overexpression and 𝘔𝘌𝘛 Genomic Alterations in NSCLC – Unveiling the Complexities of 𝘔𝘌𝘛 Dysregulation

Medical Crossfire®: Expert Perspectives on Targeting c-Met Overexpression and 𝘔𝘌𝘛 Genomic Alterations in NSCLC – Unveiling the Complexities of 𝘔𝘌𝘛 Dysregulation

Rebecca Heist, MD, MPH; Alex A. Adjei, MD, PhD, FACP; Sandip Patel, MD, FASCO; Jeremy Segal, MD, PhD

Cases & Conversations™: Transforming AML Care—Precision Strategies, Evolving Therapies, and Clinical Insights

Cases & Conversations™: Transforming AML Care—Precision Strategies, Evolving Therapies, and Clinical Insights

Gail J. Roboz, MD; Hagop Kantarjian, MD; Catherine Lai, MD, MPH; Amer Zeidan, MBBS, MHS

Evolving Treatment Strategies in Pancreatic Cancer: Current Standards, Emerging Targets, and the Role of Molecular Testing

Evolving Treatment Strategies in Pancreatic Cancer: Current Standards, Emerging Targets, and the Role of Molecular Testing

Eileen M. O’Reilly, MD; E. Gabriela Chiorean, MD, FASCO; Michael J. Pishvaian, MD, PhD; Brian Wolpin, MD, MPH

GI Tumor Board—Applying Recent Advances in Biomarker Testing and Treatment in Metastatic Colorectal Cancer

GI Tumor Board—Applying Recent Advances in Biomarker Testing and Treatment in Metastatic Colorectal Cancer

John H. Strickler, MD; Stacey A. Cohen, MD; Aparna Parikh, MD; Kanwal P.S. Raghav, MBBS, MD

$Cases and Conversations™: Sorting Through the Expanding Treatment Options for Patients with Relapsed/Refractory Multiple Myeloma$

Cases and Conversations™: Sorting Through the Expanding Treatment Options for Patients with Relapsed/Refractory Multiple Myeloma

C. Ola Landgren, MD, PhD; Mohamad Mohty, MD, PhD; Surbhi Sidana, MD

Trending on OncLive

FDA Approval Tees Up T-DXd Plus Pertuzumab as a New SOC in HER2+ Breast Cancer

Unpacking the FDA Approvals That Reshaped Cancer Care in 2025

NALIRIFOX and FOLFIRINOX Facilitate Personalized Treatment in Metastatic Pancreatic Cancer

NCCN Guidelines Recognize MammaPrint/BluePrint for Determining Anthracycline Benefit in Breast Cancer

Iberdomide Plus Daratumumab/Dexamethasone Displays High Response Rates in NDMM