Medical Oncology

, 34:169 | Cite as

Correlation of early PET findings with tumor response to molecular targeted agents in patients with advanced driver-mutated non-small cell lung cancer

  • Tomonobu Koizumi
  • Toshirou Fukushima
  • Daisuke Gomi
  • Takashi Kobayashi
  • Nodoka Sekiguchi
  • Keiko Mamiya
  • Kazunari Tateishi
  • Akane Katou
  • Kazuhiro Oguchi
Original Paper


Recent advances in positron emission tomography with fluorine-18-fluorodeoxyglucose (FDG-PET) have facilitated not only the diagnosis and staging of lung cancer, but also the prediction of treatment outcome. The present study was designed to assess the usefulness of early FDG-PET examination for predicting subsequent tumor size reduction in response to molecular targeted agents in metastatic non-small cell lung cancer (NSCLC) with sensitive gene anomalies. I. In 29 targeted lesions of 10 NSCLC patients, changes in FDG uptake before and on day 7 after the initiation of molecular targeted therapy (gefitinib, n = 7; crizotinib, n = 3) were compared with subsequent radiographic tumor size reduction by RECIST. FDG uptake was evaluated as the maximum standardized uptake value (SUVmax) of each targeted lesion. SUVmax decreased in all lesions after therapy (mean SUVmax 8.3 ± 3.4 before to 3.7 ± 1.8 after therapy, p < 0.05). The % decrease in SUVmax of each lesion was significantly correlated with the % tumor size reduction (r = 0.44). In addition, the reduction rate of SUVmax in metastatic bone lesions after initiation of molecular targeted therapy was significantly lower than that in targeted organs (27.1 ± 27.5 vs. 51.2 ± 21.3%, respectively, p < 0.05). Early reduction in FDG-PET uptake after initiation of molecular targeted agents was able to predict subsequent tumor reduction in patients harboring EGFR-mutated or ALK-positive NSCLC. In addition, nontargeted bone metastasis may have different glucose metabolism after TKI treatment compared with other involved organs.


SUVmax EGFR ALK Predictive marker Glucose metabolism 



This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit-sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that none of the authors have any conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Department of Comprehensive Cancer TherapyShinshu University School of MedicineMatsumotoJapan
  2. 2.First Department of Internal MedicineShinshu University School of MedicineMatsumotoJapan
  3. 3.Position Imaging CenterAizawa HospitalMatsumotoJapan

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