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MINI 07 - ChemoRT and Translational Science (ID 110)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Locoregional Disease – NSCLC
- Presentations: 1
MINI07.06 - Pattern of Loco-Regional Failure after Definitive Chemo Radiotherapy for NSCLC. Results from NARLAL, a Phase II Randomized Trial (ID 1042)
16:45 - 18:15 | Author(s): M. Knap
Concurrent chemo-radiotherapy (CRT) is the treatment of choice in loco-regional advanced non-small cell lung cancer (LA-NSCLC). Even though the patients are treated with curative intend the loco-regional control at 2 year is only about 30% in clinical trials. The aim of this study is to compare the loco-regional failure in patients treated with 66 Gy vs 60 Gy in the randomized phase II trial, NARLAL. Furthermore to analyze the localization of relapse compared to the original treatment plan.
From 2009-2013 117 patients with LA-NSCLC were randomized in a national multicentre protocol between 60 Gy/ 30 F (arm A) and 66 Gy/ 33 F (Arm B), 5 FW. Navelbine[®] 50 mg 3 days a week was given as concomitant regimen. Patients were followed with CT scans every 3[rd] month in 2 years and hereafter every 6[th] month for another 3 years. As part of the protocol a PET-CT scan was performed 9 months after randomization. In case recurrent disease was suspected a biopsy was done from the lesion if possible. The recurrence gross tumor volume will be delineated and registered with the original radiation treatment plan to identify the site of failure.
Fifty-nine patients were treated in arm A and 58 patients in arm B. The median local recurrence free interval was 10 months in arm A and 10.9 months in arm B (p=0.57). At the end of this analysis 22 patients were alive with no evidence of loco-regional disease, 16 patients had died with no evidence of loco-regional failure. Loco-regional failure in high-dose area was diagnosed in 60 (51%) patients (33 patients in arm A and 27 patients in arm B). Loco-regional failure outside high-dose area was diagnosed in 19 patients. Fig 1. Treatment plan 60 Gy/ 30 F and PET-CT with relapse (verified by biopsy) Figure 1
Although this treatment was with curative intend, the loco-regional control was disappointingly poor in both treatment arms. This is in line with other newly published clinical dose-escalations trials for NSCLC. In order to improve loco-regional control and hopefully survival homogeneous dose-escalation is not the choice. Inhomogenous dose-escalation may be an alternative. A phase III trial on this subject has just started enrolment in Denmark (NARLAL II, www.clinicaltrials.gov). Acknowledgements Supported by CIRRO- The Lundbeck Foundation Center for Interventional Research in Radiation Oncology.
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