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Updated: May 7, 2026
Heterogeneity Mapping of Protein Expression in Tumors using Quantitative Immunofluorescence
Published on: October 25, 2011
Histotype-genotype correlation in 36 high-grade endometrial carcinomas
Lien N Hoang1, Melissa K McConechy, Martin Köbel
1Departments of *Pathology and Laboratory Medicine ¶Gynecology and Obstetrics, University of British Columbia †Genetic Pathology Evaluation Center, Vancouver General Hospital, Vancouver, BC ‡Department of Pathology, University of Calgary, Calgary, AB §Department of Pathology, University of Toronto, Toronto, ON, Canada ∥Department of Pathology, Faculty of Medicine, Norwegian Radium Hospital, University of Oslo, Oslo, Norway #Department of Pathology, Massachusetts General Hospital **Department of Pathology, Brigham and Women's Hospital, Boston, MA ††Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY.
Distinguishing high-grade endometrial carcinoma subtypes is challenging. Integrating molecular data (genotype) with morphology and p53 immunohistochemistry improves diagnostic accuracy, reducing genotype-incompatible diagnoses.
Area of Science:
- Gynecologic Pathology
- Molecular Pathology
- Oncology
Background:
- Endometrioid, serous, and clear cell carcinomas are major endometrial cancer types.
- Histologic distinction is difficult in high-grade cases, leading to diagnostic disagreement.
- Specific mutations (ARID1A, PTEN, TP53, PPP2R1A) characterize different endometrial carcinoma subtypes.
Purpose of the Study:
- To examine the correlation between tumor histotype and genotype in high-grade endometrial carcinomas.
- To assess the impact of immunophenotype (p53, p16, ER) on histotype-genotype concordance.
- To identify strategies for improving diagnostic accuracy in challenging cases.
Main Methods:
- Review of 36 previously genotyped high-grade endometrial carcinomas (23 endometrioid/clear cell, 13 serous genotype).
- Eight subspecialty pathologists rendered diagnoses based on morphology alone and after considering p53, p16, and ER immunostaining results.
- Calculation of kappa statistics to measure histotype-genotype concordance.
Main Results:
- Average histotype-genotype concordance improved from 0.55 (morphology alone) to 0.68 after incorporating immunophenotype (P<0.001).
- Genotype-incompatible diagnoses were made in 33% of cases, with disagreement among pathologists.
- Six endometrioid/clear cell and six serous genotype tumors received genotype-incompatible diagnoses.
Conclusions:
- While most morphologic diagnoses align with genotype, a significant subset shows discordance.
- Judicious use and interpretation of p53 immunohistochemistry can enhance histotype-genotype concordance.
- Improved diagnostic accuracy is crucial for understanding and managing endometrial carcinoma subtypes.