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A PET-based nomogram for oropharyngeal cancers.

J Castelli¹, A Depeursinge², V Ndoh³

¹Radiotherapy Department, Lausanne University Hospital, Switzerland; INSERM, U1099, Rennes, F-35000, France; Université de Rennes 1, LTSI, Rennes, F-35000, France.

European Journal of Cancer (Oxford, England : 1990)

|February 27, 2017

Summary

This study developed a PET-FDG imaging score to predict survival in locally advanced oropharyngeal cancer (LAOC) patients treated with radiotherapy. The score, based on metabolic tumor volume, proved more robust than traditional factors in predicting outcomes.

Keywords:

Nomogram Oropharyngeal cancer PET Prognostic score

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Area of Science:

Oncology
Nuclear Medicine
Radiotherapy

Background:

Locally advanced oropharyngeal cancer (LAOC) requires effective prognostic tools for treatment planning.
Current prognostic factors for LAOC may not fully capture treatment response and survival outcomes.
Positron Emission Tomography with Fluorodeoxyglucose (PET-FDG) offers insights into tumor metabolism.

Purpose of the Study:

To identify PET-FDG parameters predicting overall survival (OS) in LAOC patients.
To develop and validate a prognostic scoring system for LAOC based on PET-FDG.
To assess the performance of the PET-FDG score against established prognostic factors.

Main Methods:

A training cohort (n=76) of LAOC patients treated with definitive radiotherapy (RT) underwent PET-FDG imaging.
A predictive model for locoregional control (LRC) and OS was built using PET-FDG parameters.
A validation cohort (n=46) of LAOC patients was used to test the developed nomogram and scoring system.

Main Results:

Metabolic tumor volume (MTV) of the primary tumor and lymph nodes were independent predictors of LRC and OS.
The PET-FDG-based predictive score identified two distinct risk groups with significantly different median OS (42 vs. 14 months in training, not reached vs. 26 months in validation).
The PET-based nomogram demonstrated robust performance and good calibration between predicted and observed OS.

Conclusions:

A novel PET-FDG-based nomogram and scoring system can effectively predict survival in LAOC patients.
This PET-based prognostic tool showed superior performance compared to classical prognostic factors.
The validated scoring system offers a robust method for risk stratification in LAOC treated with definitive RT.