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Updated: Jan 10, 2026
09:58
Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
Published on: June 27, 2020
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Transcription factor-based subtype assignment in pulmonary large cell neuroendocrine carcinoma
Yin P Hung1, Komson Wannasai1,2, Catherine B Meador3
1Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA.
Histopathology
|November 26, 2025
Summary
Transcription factor-based subtyping helps differentiate pulmonary large cell neuroendocrine carcinoma (LCNEC) from small cell lung carcinoma (SCLC). YAP1 and HNF4A expression correlate with large-cell morphology in LCNEC.
Area of Science:
- Pulmonary pathology and oncology
- Molecular diagnostics in cancer
- Neuroendocrine tumor subtyping
Background:
- Pulmonary large cell neuroendocrine carcinoma (LCNEC) diagnosis is challenging due to overlap with small cell lung carcinoma (SCLC).
- Small cell lung carcinoma (SCLC) exhibits diverse transcription factor-based subtypes.
- Understanding LCNEC heterogeneity is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To investigate the clinicopathological significance of transcription factor-based subtyping in pulmonary LCNEC.
- To evaluate the correlation between specific transcription factor expression and LCNEC morphology.
- To differentiate LCNEC from SCLC using molecular subtyping.
Main Methods:
- Analysis of 117 patient samples diagnosed with pulmonary LCNEC or high-grade neuroendocrine carcinoma (combined/intermediate morphology).
- Immunohistochemistry (IHC) for transcription factors ASCL1, NeuroD1, POU2F3, YAP1, and HNF4A using H-scores for subtyping.
- Next-generation sequencing (NGS) performed on selected cases.
- Correlation of IHC subtyping results with cytomorphological features and clinical data.
Main Results:
- IHC subtyping identified dominant expression of ASCL1 (62%), YAP1 (17%), NeuroD1 (8%), POU2F3 (6%), and HNF4A (2%).
- YAP1 and HNF4A expression correlated significantly with large-cell morphology in LCNEC.
- POU2F3 expression was mutually exclusive with ASCL1, NeuroD1, and HNF4A, and found in some intermediate tumors with driver mutations.
- NeuroD1 dominance was more frequent in tumors with combined/intermediate morphology.
Conclusions:
- Transcription factor-based subtyping, particularly YAP1 and HNF4A expression, is a valuable tool for identifying large-cell morphology in pulmonary neuroendocrine tumors.
- This subtyping approach aids in differentiating LCNEC from SCLC and understanding tumor heterogeneity.
- Molecular subtyping may offer insights into distinct biological behaviors and potential therapeutic targets within LCNEC.
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