Published in:
01-06-2013 | Original Article
Early evaluation of neoadjuvant chemotherapy response using FDG-PET/CT predicts survival prognosis in patients with head and neck squamous cell carcinoma
Authors:
Masahiro Kikuchi, Yuji Nakamoto, Shogo Shinohara, Keizo Fujiwara, Hiroshi Yamazaki, Yuji Kanazawa, Risa Kurihara, Ippei Kishimoto, Hiroyuki Harada, Yasushi Naito
Published in:
International Journal of Clinical Oncology
|
Issue 3/2013
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Abstract
Background
The purpose of this study was to investigate the possibility of early survival prediction after completion of one cycle of neoadjuvant chemotherapy (NAC) by positron emission tomography (PET)/computed tomography (CT) with 18F-fluorodeoxyglucose (FDG).
Methods
Fifty-seven patients with advanced head and neck squamous cell carcinoma (HNSCC) underwent FDG-PET/CT scans twice, before and after one cycle of NAC. We calculated the maximal standardized uptake value (SUVmax) for a primary tumor and/or metastatic lymph nodes and defined %decrease as the %difference in SUVmax between the two scans divided by that of the initial scan. Patients were classified as responders by PET (%decrease ≥55.5% or post-NAC SUVmax ≤3.5) and by RECIST (≥30% decrease in size). The local control (LC) rate and the disease-specific survival (DSS) rate were assessed between the responders and non-responders. Multivariate analysis was also performed using the Cox proportional hazards model.
Results
In univariate analysis, the PET finding of a primary site was a significant risk factor for LC and DSS rates at 2 years after completion of NAC (P = 0.03 and 0.02, respectively), but there was no difference between responders and non-responders by the RECIST criteria. In a multivariate regression analysis, the PET finding in the primary site and the definitive therapy choice were independent prognostic factors in LC, while the PET finding in the primary site was the only independent prognostic factor in DSS.
Conclusion
Our preliminary data indicate that the PET finding in the primary lesion after one cycle of NAC was an independent prognostic factor in LC and DSS in patients with HNSCC.