Abstract
Background
The maximum standardized uptake value (SUVmax) on 18F-fluorodeoxyglucose-positron emission tomography (18F-FDG PET) within the primary tumor may predict outcome in patients with surgically resected non-small cell lung cancer (NSCLC). However, it remains uncertain whether the SUVmax of the primary tumor predicts outcome after chemotherapy in advanced NSCLC. Thus, we evaluated the ratio of SUVmax of the metastatic tumor to the primary tumor (M/P ratio) to determine whether it could be a useful marker in predicting response and outcome after chemotherapy in advanced NSCLC.
Methods
Chemo-naïve patients with advanced NSCLC who had locoregional lymph nodes and/or distant metastases other than brain, were eligible for inclusion in this study. Response and survival were analyzed according to the SUVmax of primary tumor, the ratio of the SUVmax of the tumor to the mean SUV of the mediastinum (T/M ratio) and M/P ratio.
Results
One hundred and four consecutive patients were included in the retrospective study. Patients with high M/P ratio exhibited significantly lower response rates. The value of SUVmax and T/M ratio were not associated with the response to initial chemotherapy. In the univariate analysis, T/M ratio and SUVmax were significantly associated with poor outcome. However, the outcome of non-adenocarcinoma was unaffected by T/M ratio and SUVmax. Multivariate analysis confirmed that high M/P ratio was a significant independent factor predicting a poor outcome.
Conclusion
High M/P ratio was associated with a poor response to initial chemotherapy and was a significant independent factor in predicting poor outcome in advanced NSCLC patients with metastatic tumors other than in brain.
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Kaira, K., Endo, M., Asakura, K. et al. Ratio of standardized uptake value on PET helps predict response and outcome after chemotherapy in advanced non-small cell lung cancer. Ann Nucl Med 24, 697–705 (2010). https://doi.org/10.1007/s12149-010-0412-8
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DOI: https://doi.org/10.1007/s12149-010-0412-8