Morphologic characterization of preoperatively treated prostate cancer: toward a post-therapy histologic...

Area of Science:

• Oncology
• Pathology
• Urology

Background:

• Preoperative treatment for prostate cancer (PCa) significantly alters tumor morphology.
• This alteration renders the traditional Gleason score unreliable for assessing residual disease.
• There is a need to re-evaluate PCa morphology post-treatment.

Purpose of the Study:

• To systematically classify the morphologic features of preoperatively treated PCa.
• To identify novel morphologic classifiers that predict treatment outcomes.
• To establish a standardized method for evaluating post-treatment PCa specimens.

Main Methods:

• Detailed morphologic evaluation of 115 high-risk PCa specimens from patients receiving preoperative androgen ablation (with or without chemotherapy).
• Hierarchical clustering analysis of observed morphologic characteristics.
• Univariate and multivariate analyses to correlate morphology with pathologic parameters and disease outcomes.

Main Results:

• Three distinct morphologic groups (A, B, C) of pretreated PCa were identified using hierarchical clustering.
• Group A: Predominance of cell clusters, cords, and isolated cells.
• Group C: Characterized by cribriform growth pattern or intraductal spread, strongly associated with biochemical relapse.
• Cribriform pattern and intraductal spread were stronger predictors of relapse than pathologic stage on multivariate analysis.

Conclusions:

• A novel classification system for preoperatively treated PCa based on distinct morphologic patterns has been developed.
• This classification may improve uniformity in biomarker studies and facilitate inter-institutional trial comparisons.
• The proposed morphologic classifier shows potential as a new prognostic tool for preoperatively treated prostate cancer.