Pierre Vera1, Sorina-Dana Mihailescu2, Justine Lequesne2, Romain Modzelewski3, Pierre Bohn3, Sébastien Hapdey3, Louis-Ferdinand Pépin2, Bernard Dubray4, Philippe Chaumet-Riffaud5, Pierre Decazes3, Sébastien Thureau3,4. 1. Department of Nuclear Medicine, Henri Becquerel Cancer Center and Rouen University Hospital, & QuantIF - LITIS [EA (Equipe d'Accueil) 4108 - FR CNRS 3638], Faculty of Medicine, University of Rouen, Rouen, France. pierre.vera@chb.unicancer.fr. 2. Department of Statistics and Clinical Research Unit, Henri Becquerel Cancer Center, Rouen, France. 3. Department of Nuclear Medicine, Henri Becquerel Cancer Center and Rouen University Hospital, & QuantIF - LITIS [EA (Equipe d'Accueil) 4108 - FR CNRS 3638], Faculty of Medicine, University of Rouen, Rouen, France. 4. Department of Radiation Oncology, Henri Becquerel Cancer Center and Rouen University Hospital, & QuantIF - LITIS [EA (Equipe d'Accueil) 4108], Rouen, France. 5. Department of Nuclear Medicine, Bicetre Hospital AP-HP and University Paris Sud, Orsay, France.
Abstract
PURPOSE: Chemoradiotherapy is the reference curative-intent treatment for nonresectable locally advanced non-small-cell lung carcinoma (NSCLC), with unsatisfactory survival, partially due to radiation resistance in hypoxic tissues. The objective was to update survival and toxicity at 3 years following radiotherapy boost to hypoxic tumours in NSCLC patients treated with curative-intent chemoradiotherapy. METHODS: This was an open-label, nonrandomized, multicentre, phase II clinical trial. 18F-Fluoromisonidazole (18F-FMISO) PET/CT was used to determine the hypoxic profile of the patients. 18F-FMISO-positive patients and those without organ-at-risk constraints received a radiotherapy boost (70-84 Gy); the others received standard radiotherapy (66 Gy). Overall survival (OS), progression-free survival (PFS) and safety were assessed. RESULTS: A total of 54 patients were evaluated. OS and PFS rates at 3 years were 48.5% and 28.8%, respectively. The median OS in the 18F-FMISO-positive patients was 25.8 months and was not reached in the 18F-FMISO-negative patients (p = 0.01). A difference between the groups was also observed for PFS (12 months vs. 26.2 months, p = 0.048). In 18F-FMISO-positive patients, no difference was observed in OS in relation to dose, probably because of the small sample size (p = 0.30). However, the median OS seemed to be in favour of patients who received the radiotherapy boost (26.5 vs. 15.3 months, p = 0.71). In patients who received the radiotherapy boost, no significant late toxicities were observed. CONCLUSION: 18F-FMISO uptake in NSCLC patients is strongly associated with features indicating a poor prognosis. In 18F-FMISO-positive patients, the radiotherapy boost seemed to improve the OS by 11.2 months. A further clinical trial is needed to investigate the efficacy of a radiotherapy boost in patients with hypoxic tumours.
PURPOSE: Chemoradiotherapy is the reference curative-intent treatment for nonresectable locally advanced non-small-cell lung carcinoma (NSCLC), with unsatisfactory survival, partially due to radiation resistance in hypoxic tissues. The objective was to update survival and toxicity at 3 years following radiotherapy boost to hypoxic tumours in NSCLCpatients treated with curative-intent chemoradiotherapy. METHODS: This was an open-label, nonrandomized, multicentre, phase II clinical trial. 18F-Fluoromisonidazole (18F-FMISO) PET/CT was used to determine the hypoxic profile of the patients. 18F-FMISO-positive patients and those without organ-at-risk constraints received a radiotherapy boost (70-84 Gy); the others received standard radiotherapy (66 Gy). Overall survival (OS), progression-free survival (PFS) and safety were assessed. RESULTS: A total of 54 patients were evaluated. OS and PFS rates at 3 years were 48.5% and 28.8%, respectively. The median OS in the 18F-FMISO-positive patients was 25.8 months and was not reached in the 18F-FMISO-negative patients (p = 0.01). A difference between the groups was also observed for PFS (12 months vs. 26.2 months, p = 0.048). In 18F-FMISO-positive patients, no difference was observed in OS in relation to dose, probably because of the small sample size (p = 0.30). However, the median OS seemed to be in favour of patients who received the radiotherapy boost (26.5 vs. 15.3 months, p = 0.71). In patients who received the radiotherapy boost, no significant late toxicities were observed. CONCLUSION:18F-FMISO uptake in NSCLCpatients is strongly associated with features indicating a poor prognosis. In 18F-FMISO-positive patients, the radiotherapy boost seemed to improve the OS by 11.2 months. A further clinical trial is needed to investigate the efficacy of a radiotherapy boost in patients with hypoxic tumours.
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