Physical Activity and Prostate Tumor Vessel Morphology: Data from the Health Professionals Follow-up Study

Area of Science:

• Oncology
• Exercise Science
• Pathology

Background:

• Vigorous physical activity is linked to reduced prostate cancer progression, but underlying biological mechanisms remain unclear.
• Tumor vascularization, specifically small, irregular vessels, is associated with fatal prostate cancer.
• Exercise impacts tumor vascularization in animal models, suggesting a potential role in human prostate cancer.

Purpose of the Study:

• To investigate the association between physical activity levels and prostate tumor microvessel morphology.
• To determine if vigorous activity or brisk walking correlates with improved blood vessel characteristics within prostate tumors.

Main Methods:

• Prospective study of 571 men from the Health Professionals Follow-up Study.
• Analysis of prostate tumor sections stained for CD34 to assess microvessel size, regularity, and density.
• Assessment of physical activity (vigorous, nonvigorous, walking pace) via self-report, a median of 14 months before diagnosis.

Main Results:

• Men reporting a brisk walking pace (≥3 mph) exhibited larger and more regularly shaped blood vessels in their prostate tumors compared to slower walkers.
• Brisk walking was associated with increased vessel regularity (OR, 1.59) and size (OR, 1.48).
• No significant association was found between brisk walking and microvessel density, nor between overall vigorous/nonvigorous activity and vessel morphology or density.

Conclusions:

• Brisk walking may be associated with more favorable prostate tumor vascular characteristics, specifically larger and more regular blood vessels.
• These findings suggest a potential biological mechanism linking physical activity to prostate cancer progression.
• Further research is warranted to fully elucidate the impact of physical activity on prostate tumor biology.