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Validation of the postoperative nomogram for 12-year sarcoma-specific mortality
Fritz C Eilber1, Murray F Brennan, Frederick R Eilber
1Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.
Cancer
|October 16, 2004
Summary
This study validated a soft tissue sarcoma (STS) nomogram using external data. The nomogram accurately predicted patient survival, confirming its clinical utility for STS.
Area of Science:
- Oncology
- Medical Statistics
Background:
- A nomogram for predicting sarcoma-specific mortality was developed using data from Memorial Sloan-Kettering Cancer Center (MSKCC).
- Internal validation showed accuracy, but external validation was needed to confirm its universal applicability.
Purpose of the Study:
- To externally validate the MSKCC Sarcoma Nomogram for predicting survival in adult patients with primary soft tissue sarcoma (STS).
Main Methods:
- A cohort of 929 adult patients with primary STS treated at UCLA between 1975-2002 was analyzed.
- Nomogram validation involved quantifying discrimination using the concordance index and assessing calibration by comparing predicted probabilities with observed survival rates.
Main Results:
- The 5-year and 10-year disease-specific survival rates were 77% and 71%, respectively.
- The nomogram achieved a concordance index of 0.76 in the external cohort.
- A high level of calibration was observed between predicted and actual outcomes.
Conclusions:
- The MSKCC Sarcoma Nomogram demonstrated accurate survival predictions when applied to an external patient cohort at UCLA.
- This external validation supports the nomogram's utility in clinical practice for STS patients.