Abstract
Purpose
PET is a powerful tool for assessing targeted therapy. Since 18F-FDG shows a potential prognostic value in medullary thyroid carcinoma (MTC), this study evaluated 18F-FDG PET alone and combined with morphological and biomarker evaluations as a surrogate marker of overall survival (OS) in patients with progressive metastatic MTC treated with pretargeted anti-CEA radioimmunotherapy (pRAIT) in a phase II clinical trial.
Methods
Patients underwent PET associated with morphological imaging (CT and MRI) and biomarker evaluations, before and 3 and 6 months, and then every 6 months, after pRAIT for 36 months. A combined evaluation was performed using anatomic, metabolic and biomarker methods. The prognostic value of the PET response was compared with demographic parameters at inclusion including age, sex, RET mutation, time from initial diagnosis, calcitonin and CEA concentrations and doubling times (DT), SUVmax, location of disease and bone marrow involvement, and with response using RECIST, biomarker concentration variation, impact on DT, and combined methods.
Results
Enrolled in the study were 25 men and 17 women with disease progression. The median OS from pRAIT was 3.7 years (0.2 to 6.5 years) and from MTC diagnosis 10.9 years (1.7 to 31.5 years). After pRAIT, PET/CT showed 1 patient with a complete response, 4 with a partial response and 24 with disease stabilization. The combined evaluation showed 20 responses. For OS from pRAIT, univariate analysis showed the prognostic value of biomarker DT (P = 0.011) and SUVmax (P = 0.038) calculated before pRAIT and impact on DT (P = 0.034), RECIST (P = 0.009), PET (P = 0.009), and combined response (P = 0.004) measured after pRAIT. PET had the highest predictive value with the lowest Akaike information criterion (AIC 74.26) as compared to RECIST (AIC 78.06), biomarker variation (AIC 81.94) and impact on DT (AIC 79.22). No benefit was obtained by combining the methods (AIC 78.75). This result was confirmed by the analysis of OS from MTC diagnosis.
Conclusion
18F-FDG PET appeared as the most potent and simplest prognostic method to predict survival in patients with progressive MTC treated with pRAIT. Biomarker DT before pRAIT also appeared as an independent prognostic factor, but no benefit was found by adding morphological and biomarker evaluation to PET assessment.
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Acknowledgments
This work was supported in part by a grant from French Programme Hospitalier de Recherche 2002, the French National Agency for Research (“Investissements d’Avenir”, no. ANR-11-LABX-0018-01), and by a grant from the Pays de la Loire Regional Council (“NucSan”).
Disclosure statement
David M. Goldenberg has a leadership position at Immunomedics, Inc., and IBC Pharmaceuticals, Inc. (Morris Plains, NJ).
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Salaun, PY., Campion, L., Ansquer, C. et al. 18F-FDG PET predicts survival after pretargeted radioimmunotherapy in patients with progressive metastatic medullary thyroid carcinoma. Eur J Nucl Med Mol Imaging 41, 1501–1510 (2014). https://doi.org/10.1007/s00259-014-2772-0
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DOI: https://doi.org/10.1007/s00259-014-2772-0