Abstract
Background
A metabolic shift to glycolysis is reportedly involved in radioresistance. We examined whether pretreatment 18F-fluorodeoxyglucose positron emission tomography (FDG-PET), which can detect enhanced glucose uptake, was able to predict the therapeutic response to chemoradiotherapy (CRT) in patients with pancreatic cancer (PC).
Methods
Of 125 PC patients (75 unresectable and 50 borderline resectable), 37 and 26 underwent induction chemotherapy before CRT and surgical resection after CRT, respectively. FDG-PET was performed at three different institutions.
Results
Of the 88 patients who underwent upfront CRT, 31 (35%), 34 (39%), and 23 (26%) showed a partial response (PR), stable disease, and progressive disease, respectively. The tumor PR rate was an independent factor associated with longer overall survival (OS) on multivariate analysis. We evaluated the optimal cut-off of maximum standardized uptake values (SUVmax) at initial diagnosis to detect the tumor PR rate at the three institutions separately. The SUVmax was independently associated with tumor response rate on multivariate analysis. In the low SUVmax group, induction chemotherapy had no significant impact on OS. In contrast, induction chemotherapy was significantly associated with longer OS in the high SUVmax group.
Conclusions
FDG-PET SUVmax was significantly associated with the therapeutic response to CRT in PC patients. Moreover, induction chemotherapy may improve the prognosis of patients with a high SUVmax tumor.
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Hiroshi Kurahara, Kosei Maemura, Yuko Mataki, Masahiko Sakoda, Satoshi Iino, Yota Kawasaki, Takaaki Arigami, Shinichiro Mori, Yuko Kijima, Shinichi Ueno, Hiroyuki Shinchi, and Shoji Natsugoe declare that they have no commercial interests.
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Supplementary Figure 1. This study included 50 borderline resectable (BR) and 75 unresectable (UR) pancreatic cancer patients. Of the 125 patients, 37 underwent induction chemotherapy. During chemotherapy, two patients had distant metastasis, and the remaining 35 patients underwent subsequent CRT
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Supplementary Figure 2. Distribution of the SUVmax of all patients who underwent upfront CRT by institution
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Kurahara, H., Maemura, K., Mataki, Y. et al. Significance of 18F-Fluorodeoxyglucose (FDG) Uptake in Response to Chemoradiotherapy for Pancreatic Cancer. Ann Surg Oncol 26, 644–651 (2019). https://doi.org/10.1245/s10434-018-07098-6
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DOI: https://doi.org/10.1245/s10434-018-07098-6