Defining oligometastatic non-small cell lung cancer: A simulated multidisciplinary expert opinion

Introduction: Synchronous oligometastatic non-small cell lung cancer (NSCLC) definition varies from 1 metastasis in 1 organ (tumour-node-metastasis 8 [TNM8]), 1-3 metastases (European Society for Medical Oncology [ESMO]),Methods: In December 2017, 10 real-life multidisciplinary team (MDT) discussed patients (good condition, no significant comorbidities, F-18-fluorodeoxyglucose positron emission tomography/brain magnetic resonance imaging staged, all <5 metastases, 9/10Results: Twenty-six of 33 experts (24 centres) replied: 8 medical oncologists, 7 pulmonologists, 7 radiation oncologists, 4 thoracic surgeons. Sixty-two percent of respondents discussed the cases with their MDT. One case had 100% oligometastatic consensus, and 3 cases had >90% consensus; the number of treatment proposals varied between 3 and 8. Radical treatment was more often offered in case of single metastasis or N0. Compared with 2012, there was a trend towards a more conservative oligometastatic definition and chemotherapy was more frequently included in the treatment proposal.Conclusions: Oligometastatic NSCLC definition was conservative. The number of organs, MLN status and radical treatment possibility seem to be components of daily practice oligometastatic definition. (C) 2019 Elsevier Ltd. All rights reserved.