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Pierre Fournel
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MA16 - Novel Mechanisms for Molecular Profiling (ID 917)
- Event: WCLC 2018
- Type: Mini Oral Abstract Session
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 9/25/2018, 13:30 - 15:00, Room 203 BD
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MA16.09 - Feasibility, Clinical Relevance of ALK/ROS1 Fusion Variant Detection by Liquid Biopsy in Advanced Non-Small Cell Lung Cancer (ID 13492)
14:30 - 14:35 | Author(s): Pierre Fournel
- Abstract
- Presentation
Background
Liquid biopsy offers an alternative non-invasive approach to reflect the tumor genomic landscape of NSCLC patients; however, the potential of liquid biopsies for ALK/ROS1 fusion detection is poorly described. Herein, we evaluated an amplicon-based NGS assay for ctDNA detection of ALK and ROS1 fusions in a large cohort of ALK and ROS1 NSCLC patients and correlation of variants with clinical data.
a9ded1e5ce5d75814730bb4caaf49419 Method
ALK- and ROS1-translocated advanced NSCLC patients, were prospectively enrolled from October 2015 to April 2018 in 9 French institutions. ALK or ROS1 positivity was as confirmed by immunochemistry and FISH or RNAseq. ALK (EML4 variants v1, v2, v3), ROS1 (CD74, SLC34A2, SDC4 and EZR) fusions, and mutations in a panel of 36 NSCLC-associated genes were investigated in ctDNA using InVisionFirst™ (Plagnol V PLoS ONE, 2018).
4c3880bb027f159e801041b1021e88e8 Result
A total of 120 patients were included: 96 ALK and 24 ROS1. 30 samples were collected from patients who were TKI-treatment-naive, 257 during follow-up and 73 at progressive disease (PD) under TKI. The median age was 55 years-old (range 23-75); most patients were female (57%) and had a non-smoking history (59%). At diagnosis, 20% of patients presented with brain metastasis. All patients received at least 1 ALK-TKI (median: 1.6; range:1-6).
Preliminary results are available for the first 54 patients: 21 at diagnosis and 33 at PD under TKI. ALK/ROS1 fusions were detected in 13/21 patients (62%) at diagnosis: 12/20 ALK-fusions (7 v1, 2 v2 and 3 v3) and in 1/1 ROS1-fusion (CD74-ROS1). No fusion was detected in 8 patients, which may be due to partner genes or variants not covered by this panel. However, 5 of these 8 patients had exclusive thoracic or brain PD.
Liquid biopsies collected at the radiographic evaluation under therapy revealed complete ctDNA clearance of the fusion when patients experienced PR (n=4). In samples at PD, fusion was detected in 44% of patients (24/55) with evidence of acquired resistance in patients both positive and negative for fusion.
Results for the remaining samples, correlation between fusion variant and survival, fusion variant and mechanism of resistance will be presented at the Congress.
8eea62084ca7e541d918e823422bd82e Conclusion
Our results suggest that ctDNA profiling is a promising non-invasive tool for identification of ALK/ROS1 fusions and monitoring of response in advanced NSCLC patients. Systematic identification of the fusion partner may help to better understand the heterogeneity and evolution (sensitivity profile to targeted inhibitors and associated-mechanisms of resistance) of NSCLC driven by ALK and ROS1 rearrangement.
6f8b794f3246b0c1e1780bb4d4d5dc53Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
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P1.01 - Advanced NSCLC (Not CME Accredited Session) (ID 933)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Track:
- Presentations: 1
- Moderators:
- Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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P1.01-67 - Clinical Relevance of ALK/ROS1 Resistance Mutations and Other Acquired Mutations Detected by Liquid Biopsy in Advanced NSCLC Patients (ID 14279)
16:45 - 18:00 | Author(s): Pierre Fournel
- Abstract
Background
Liquid biopsies (LB) for circulating tumor DNA (ctDNA) can be a tool for somatic mutation detectionin NSCLC patients. However, the applicability and clinical relevance of ALK/ROS1 and other acquired mutation detected by LB is poorly described. We evaluated ALK/ROS1 and other acquired mutations detected by ctDNA in a large cohort of ALK/ROS1+ NSCLC patients described to date.
a9ded1e5ce5d75814730bb4caaf49419 Method
Advanced ALK/ROS1+ NSCLC patients were prospectively enrolled from October 15 to April 2018 in 9 French institutions. ctDNA anlaysis was performed using ctDNA using InVisionFirst™ (36-gene panel) for ALK (EML4 variants v1, v2, v3), ROS1 (CD74, SLC34A2, SDC4 and EZR) fusions, and other somatic mutations.
4c3880bb027f159e801041b1021e88e8 Result
120 patients were included: 96 ALK, 24 ROS1. The median prior tyrosine kinase inhibitors (TKI) received was 2 (0-4). Blood samples (n=402) were collected: tyrosine kinase inhibitors (TKI)-naive (n=30), during (n=257) or at progression (PD) under TKI (n=73. Prior treated patients received at least 1 TKI (1-6). Preliminary results are available for the first 54 patients; ALK/ROS1 status was confirmed by ALK IHC (39), FISH (56) and RNAseq (2).
ALK mutations were detected in 36% of blood samples at PD to TKI (12/33): 8% (1/13) post-crizotinib and 55% (11/20) post next-generation TKI (F1174/F1174V/D1203N/R1192P/G1202R (6)/F1174L+G1202/G1202R+F1174L+C1156Y). Complex ALK mutations were observed in 2/12 samples (17%) post next-generation TKI (G1202R+F1174L+C1156Y/F1174L+G1202R). Other acquired mutations were found in 36% (12/33) of samples at PD: TP53 (10), NFE2L2 (4), PTEN (2), PI3KCA (1), CDKN2A (1). Complex ALK mut.+ non-ALK mut. were found in 6/33 (18%) samples, 1 post crizotinib (G1269A+R1264K+L1196Q+F1164L+C1156Y+NFE2L2(4)), and 5 samples post next-gen TKI (G1202R+PTEN/G1202R+TP53/F1174L+G1202R+TP53/TP53(2)+D1203N/TP53+R1192P). Non-ALK mut. were exclusive and could explain TKI resistance in 6/33 (18%) samples.
8eea62084ca7e541d918e823422bd82e Conclusion
Routine liquid biopsies can assess the heterogeneity of the TKI resistance, detecting ALK resistance and other acquired mutations in pretreated advanced ALK & ROS1 NSCLC patients. This could have an impact on clinical outcomes. The association of ALK mut. and complex ALK mut. +/- other acquired mut. with clinical outcomes will be presented at the congress.
6f8b794f3246b0c1e1780bb4d4d5dc53
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P1.04 - Immunooncology (Not CME Accredited Session) (ID 936)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Track:
- Presentations: 1
- Moderators:
- Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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P1.04-31 - Efficacy and Tolerance of Immune-Checkpoint Inhibitors in EGFR, ALK/ROS 1 Non-Small-Cell-Lung-Cancer (NSCLC): GFPC 03-2016 IMAD Study (ID 11166)
16:45 - 18:00 | Author(s): Pierre Fournel
- Abstract
Background
Patients with molecular alterations are considered to be poor candidates for immune- checkpoint inhibitors (ICI) on the second-line phase III trials. Here, we analyze the efficacy of ICI in EGFR /ALK/ROS1 NSCLC patients in real world setting
a9ded1e5ce5d75814730bb4caaf49419 Method
This retrospective, multicentric study in EGFR, ALK and ROS1 NSCLC treated by ICI, analyzed clinical characteristics and outcomes (progression free survival (PFS), duration of ICI treatment and overall survival (OS), since initiation of ICI .
4c3880bb027f159e801041b1021e88e8 Result
51 patients were included from 20 centers in France: 100% adenocarcinoma, 60.7% never smokers, 58.8% female, 58 ± 8.8 years age at diagnosis (36-83), 82.3% EGFR mutated, 15.7 % and 2% ALK and ROS 1 translocated respectively. ICI was a third line treatment in 35,3% of cases, a fourth and more lines treatment in 64,7% of cases. Median PFS was 2.1. [95% CI: 1.5-3.2] months for the whole population, 2.15 [95% CI: 1.4-3;2], for EGFR patients and 2.4 [95% CI: 2.1; NR] for ALK tranlocated patients; 3 months-PFS were 37,3% [95% CI: 26.1; 53.2]; 8 weeks ORR were 19.6% (10 pts with partial response). The median OS for the whole population was 14.7.[95%CI: 12.1-19.2] months, 13.9 [95% CI: 8.8-20] for EGFR patients, 19.2. [95% CI: 13.1-NR] for ALK translocated; 7 (13.7%) patients were treated more than 9 months by ICI; 21.6% (11/51) of patients reported toxicities, all < grade3.
8eea62084ca7e541d918e823422bd82e Conclusion
In this real-world setting analysis, efficacy of ICI in EGFR, ALK, ROS1 NSCLC patients appears close to the efficacy observed in pretreated unselected NSCLC patients. Large prospective studies are needed in these populations
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