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High Extratumoral Mast Cell Counts Are Associated with a Higher Risk of Adverse Prostate Cancer Outcomes
Heidi Hempel Sullivan1, Christopher M Heaphy1,2, Ibrahim Kulac1
1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Summary
High numbers of mast cells outside prostate tumors correlate with increased risk of cancer recurrence and metastasis after surgery. This finding holds true across different races and disease grades, highlighting their prognostic value.
Area of Science:
- Oncology
- Immunology
- Pathology
Background:
- Previous research linked low intratumoral and high extratumoral mast cells to higher biochemical recurrence risk after prostatectomy.
- This study investigates the association of mast cell distribution with race and the development of metastases.
Purpose of the Study:
- To assess the relationship between mast cell counts (intratumoral and extratumoral) and prostate cancer outcomes.
- To determine if race influences this association.
- To investigate the link between mast cell distribution and the development of metastases.
Main Methods:
- Mast cell tryptase was stained using immunohistochemistry and fluorescent immunolabeling.
- Analysis included 885 men with data on race and prostate cancer outcomes (median follow-up: 7.0 years).
- Statistical analysis assessed associations between mast cell counts, recurrence, and metastases.
Main Results:
- African-American men had significantly lower intratumoral and extratumoral mast cell counts compared to European-American men.
- Higher extratumoral mast cell counts were associated with increased risk of biochemical recurrence (HR, 1.61) and prostate cancer metastases (HR, 2.12).
- No significant association was found between intratumoral mast cell count and biochemical recurrence.
Conclusions:
- High numbers of extratumoral mast cells are linked to biochemical recurrence and the development of metastases after radical prostatectomy.
- Extratumoral mast cell counts serve as a prognostic indicator for adverse outcomes in prostate cancer patients.
