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Comparison of methods for calculating prostate specific antigen velocity
Xiaoying Yu1, Misop Han, Stacy Loeb
1Department of Urology, Northwestern University, Feinberg School of Medicine, Northwestern Medical Faculty Foundation, 675 N. Saint Clair Street, Chicago, IL 60611, USA.
The Journal of Urology
|November 7, 2006
Summary
Simple arithmetic calculation of prostate specific antigen velocity within one year of diagnosis is comparable to regression analysis. This method can aid in predicting outcomes for prostate cancer patients undergoing definitive therapy.
Area of Science:
- Urology
- Oncology
- Biostatistics
Background:
- Prostate specific antigen (PSA) velocity is a key metric for assessing prostate cancer progression.
- Current methods often use regression analysis over 18-24 months, but simpler alternatives are under investigation.
- PSA velocity in the year preceding diagnosis correlates with mortality after treatment.
Purpose of the Study:
- To compare simple arithmetic PSA velocity calculations with regression analysis.
- To determine if these methods are interchangeable for predicting outcomes.
- To evaluate PSA velocity calculations using varying time intervals.
Main Methods:
- 540 men with localized prostate cancer undergoing radical retropubic prostatectomy (2003-2005) were analyzed.
- Preoperative PSA velocity was computed using arithmetic and linear regression over 12 and 18-month periods.
- Correlation, mean, and median PSA velocity were compared across methods.
Main Results:
- Arithmetic and linear regression methods showed strong correlation (r=0.92) when using PSA values from the 12 months before diagnosis.
- Including PSA measurements beyond one year resulted in significantly lower PSA velocity.
- PSA velocity calculations varied based on the time interval used.
Conclusions:
- Simple arithmetic PSA velocity calculation is a viable alternative to complex regression analysis for localized prostate cancer when restricted to the year before diagnosis.
- Arithmetic PSA velocity calculations can be utilized in clinical practice for outcome prediction post-therapy.
- Longer intervals for PSA velocity calculation yield lower values, indicating a need for standardized methodology.
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