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Validation of statistical predictive models meant to select melanoma patients for sentinel lymph node biopsy.

Abstract：

INTRODUCTION:To identify melanoma patients at sufficiently low risk of nodal metastases who could avoid sentinel lymph node biopsy (SLNB), several statistical models have been proposed based upon patient/tumor characteristics, including logistic regression, classification trees, random forests, and support vector machines. We sought to validate recently published models meant to predict sentinel node status. METHODS:We queried our comprehensive, prospectively collected melanoma database for consecutive melanoma patients undergoing SLNB. Prediction values were estimated based upon four published models, calculating the same reported metrics: negative predictive value (NPV), rate of negative predictions (RNP), and false-negative rate (FNR). RESULTS:Logistic regression performed comparably with our data when considering NPV (89.4 versus 93.6%); however, the model's specificity was not high enough to significantly reduce the rate of biopsies (SLN reduction rate of 2.9%). When applied to our data, the classification tree produced NPV and reduction in biopsy rates that were lower (87.7 versus 94.1 and 29.8 versus 14.3, respectively). Two published models could not be applied to our data due to model complexity and the use of proprietary software. CONCLUSIONS:Published models meant to reduce the SLNB rate among patients with melanoma either underperformed when applied to our larger dataset, or could not be validated. Differences in selection criteria and histopathologic interpretation likely resulted in underperformance. Statistical predictive models must be developed in a clinically applicable manner to allow for both validation and ultimately clinical utility.

journal_name

Ann Surg Oncol

journal_title

Annals of surgical oncology

authors

Sabel MS,Rice JD,Griffith KA,Lowe L,Wong SL,Chang AE,Johnson TM,Taylor JM

doi

10.1245/s10434-011-1979-6

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

287-93

issue

1

eissn

1068-9265

issn

1534-4681

journal_volume

19

pub_type

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