Published in:
Open Access
01-07-2019 | Breast Cancer | Breast Oncology
Significance of Metabolic Tumor Volume at Baseline and Reduction of Mean Standardized Uptake Value in 18F-FDG-PET/CT Imaging for Predicting Pathological Complete Response in Breast Cancers Treated with Preoperative Chemotherapy
Authors:
Tomoko Higuchi, MD, Yukie Fujimoto, MD, Hiromi Ozawa, MD, Ayako Bun, MD, Reiko Fukui, MD, Yoshimasa Miyagawa, MD, PhD, Michiko Imamura, MD, PhD, Kazuhiro Kitajima, MD, PhD, Koichiro Yamakado, MD, PhD, Yasuo Miyoshi, MD, PhD
Published in:
Annals of Surgical Oncology
|
Issue 7/2019
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Abstract
Background
The usefulness of 18F-fluorodeoxyglucose-positron emission tomography/computed tomography for evaluating the treatment efficacy of breast cancers is well-established; however, the predictive values of parameters such as metabolic tumor volume (MTV) and total lesion glycolysis (TLG) remain unknown.
Methods
This study examined 199 breast cancers treated with primary systemic chemotherapy (PSC) followed by operation, and determined the values of maximum standardized uptake value (SUVmax), peak SUV (SUVpeak), mean SUV (SUVmean), MTV, and TLG at baseline. Among these cases, data on early changes in these metabolic parameters in 70 breast cancers were also assessed.
Results
A pathological complete response (pCR) was achieved in 64 breast cancers. Breast cancers with low MTV at baseline had a significantly higher pCR rate than breast cancers with high MTV (47.9% vs. 23.4%; p = 0.0005). High reduction rates (∆) of SUVmax (p = 0.0001), SUVpeak (p = 0.0001), and SUVmean (p < 0.0001) resulted in an increased pCR compared with those for low ∆. The pCR rate was highest for the combination of low MTV and high ∆SUVmean (86.7%), and lowest for high MTV and low ∆SUVmean (15.4%); the remaining combinations were intermediate (58.6%; p < 0.0001). The combination of low MTV at baseline and high ∆SUVmean was a significant and independent predictor for pCR (odds ratio 28.63; 95% confidence interval 1.94–422.42; p = 0.0146) in multivariable analysis.
Conclusions
Low levels of MTV at baseline and a high reduction of SUVmean after PSC was significantly associated with pCR. These findings suggest the usefulness of these metabolic parameters for predicting the treatment efficacy of breast cancers.