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Updated: Apr 15, 2026
Author Spotlight: Advancing Prostate Cancer Research Through Improved Tissue Sampling and Biobanking
Published on: November 17, 2023
Molecular differences in transition zone and peripheral zone prostate tumors
Jennifer A Sinnott1, Jennifer R Rider2, Jessica Carlsson3
1Department of Epidemiology and Department of Biostatistics, Harvard School of Public Health, Boston, MA 02115, USA, Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
Prostate tumors originating in the transition zone (TZ) may have better outcomes, indicated by lower Gleason scores. A gene expression signature helps identify tumor zone of origin, crucial for prostate cancer research.
Area of Science:
- Urology
- Oncology
- Molecular Biology
Background:
- Prostate tumors originate in either the peripheral zone (PZ) or transition zone (TZ).
- Determining the zone of origin is clinically challenging but may offer prognostic insights.
- Zonal origin might correlate with distinct molecular subtypes of prostate cancer.
Purpose of the Study:
- To develop and validate a gene expression signature for determining prostate tumor zone of origin.
- To investigate the association between molecularly determined zone of origin and clinical factors, including mortality and Gleason score.
- To assess if the signature can differentiate between tumor samples obtained from radical prostatectomy (RP) and transurethral resection of the prostate (TURP).
Main Methods:
- Whole-genome gene expression profiling of normal prostate tissue to create a zonal signature.
- Application of the signature to classify tumors of known and unknown zone of origin.
- Statistical analysis to correlate signature-based zonal classification with clinical outcomes (Gleason score, mortality) and sample type (RP vs. TURP).
Main Results:
- A gene expression signature successfully classified prostate tumors based on their zone of origin.
- Tumors molecularly resembling TZ origin were associated with lower mortality and Gleason scores.
- The signature effectively distinguished between RP (predominantly PZ) and TURP (predominantly TZ) tumor samples with high accuracy (87% AUC).
Conclusions:
- Zonal differences in gene expression are maintained from normal tissue to tumor tissue.
- The molecularly determined zone of origin is linked to key clinical parameters like Gleason score.
- These findings suggest distinct molecular subtypes and potential etiologic pathways for prostate tumors arising in different zones, highlighting the importance of zone of origin in biomarker research.
