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P1.04 - Immunooncology (Not CME Accredited Session) (ID 936)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Presentations: 1
- Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
P1.04-17 - Tumour Burden as a Predictive Tool of Response to Immune Checkpoint Inhibitors (ICI) in Patients with Metastatic Non-Small-Cell Lung Cancer (ID 12467)
16:45 - 18:00 | Author(s): Liran Domachevsky
ICI are a novel class of agents that have revolutionized treatment for patients with metastatic non-small-cell lung cancer (NSCLC). Still, most patients do not benefit from PD-1 axis inhibitors, emphasizing the need for additional markers beyond PDL-1 expression for better selection of patients.a9ded1e5ce5d75814730bb4caaf49419 Method
This retrospective, single centre study included all consecutive patients with advanced NSCLC who were evaluated with a FDG-PET scan prior to first administration of an ICI (nivolumab or pembrolizumab) between 1/2016 and 6/2017. Tumour burden was calculated using the total body Metabolic Tumour Volume (MTV) and the sum of all measurable lesions (SOML) with accordance to the RECIST criteria. This study received IRB approval.4c3880bb027f159e801041b1021e88e8 Result
A total of 58 patients with histologically proven NSCLC were included. Patients had a median age of 65 years (43-84), 59% were male, 62% had adenocarcinoma and 83% were previously treated with chemotherapy. The median PFS for the entire cohort was 5.7 (1-15.8) months, and the ORR for ICI was 44.8%.
The median MTV was 12.95 (0-236) millimeter³ and was significantly and inversely associated with longer PFS (p=0.036, 95%CI 1-1.015). The median SOML was 88 (13-305) centimetres, and was significantly and inversely associated with a longer PFS and higher ORR (PFS: P=0.004, 95% CI 1.002-1.011, ORR: OR 0.993 p=0.0067(.
Additionally, patients with a SOML under 56 CM (first quartile) had a longer PFS compared to patients with a higher disease volume (Table1).
(compared to 1st quartile)
1st quartile 56 12.1 - 2nd quartile 88 5.1 0.017 3rd quartile 115 4.23 0.036 4th quartile 305 3.15 0.01
table 1: some of measurable lesions (in centimeters) and PFS in metastatic NSCLC pateints recieving ICI8eea62084ca7e541d918e823422bd82e Conclusion
In our study, a high tumour burden in patients with advanced NSCLC treated with ICI was associated with a shorter PFS and a lower ORR. This association warrants further prospective evaluation in order to optimize treatment.6f8b794f3246b0c1e1780bb4d4d5dc53
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