Nomogram to Predict Insignificant Prostate Cancer at Radical Prostatectomy in Korean Men: A Multi-Center Study
Yonsei Medical Journal
;
: 74-80, 2011.
Article
in English
| WPRIM
| ID: wpr-146143
ABSTRACT
PURPOSE:
Due to the availability of serum prostate specific antigen (PSA) testing, the detection rate of insignificant prostate cancer (IPC) is increasing. To ensure better treatment decisions, we developed a nomogram to predict the probability of IPC. MATERIALS ANDMETHODS:
The study population consisted of 1,471 patients who were treated at multiple institutions by radical prostatectomy without neoadjuvant therapy from 1995 to 2008. We obtained nonrandom samples of n = 1,031 for nomogram development, leaving n = 440 for nomogram validation. IPC was defined as pathologic organ-confined disease and a tumor volume of 0.5 cc or less without Gleason grade 4 or 5. Multivariate logistic regression model (MLRM) coefficients were used to construct a nomogram to predict IPC from five variables, including serum prostate specific antigen, clinical stage, biopsy Gleason score, positive cores ratio and maximum % of tumor in any core. The performance characteristics were internally validated from 200 bootstrap resamples to reduce overfit bias. External validation was also performed in another cohort.RESULTS:
Overall, 67 (6.5%) patients had a so-called "insignificant" tumor in nomogram development cohort. PSA, clinical stage, biopsy Gleason score, positive core ratio and maximum % of biopsy tumor represented significant predictors of the presence of IPC. The resulting nomogram had excellent discrimination accuracy, with a bootstrapped concordance index of 0.827.CONCLUSION:
Our current nomogram provides sufficiently accurate information in clinical practice that may be useful to patients and clinicians when various treatment options for screen-detected prostate cancer are considered.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Prostatectomy
/
Prostatic Neoplasms
/
Logistic Models
/
Asian People
/
Nomograms
Type of study:
Controlled clinical trial
/
Prognostic study
/
Risk factors
Limits:
Aged
/
Humans
/
Male
Language:
English
Journal:
Yonsei Medical Journal
Year:
2011
Type:
Article
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