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MA03 - Clinomics and Genomics (ID 119)
- Event: WCLC 2019
- Type: Mini Oral Session
- Track: Advanced NSCLC
- Presentations: 1
- Now Available
- Moderators:Heather A Wakelee, Wilfried Ernst Erich Eberhardt
- Coordinates: 9/08/2019, 10:30 - 12:00, Colorado Springs (1994)
MA03.09 - Dramatic Responses to Immune Checkpoint Inhibitors in MET Exon 14 Skipping Mutation (METex14mut) Non Small Cell Lung Cancers (Now Available) (ID 1621)
10:30 - 12:00 | Author(s): Leila Zemoura
METex14 mutations occur in 2-3% of Non-Small-Cell Lung Cancers (NSCLC), with a higher prevalence in patients aged over 70-years-old, non-smokers.and women. Crizotinib, a MET-inhibitor, allows remarkable, but often short, tumor responses. Immune Checkpoint Inhibitors (ICIs) have become pivotal treatments in NSCLC but seem less efficient in non-smokers and in case of oncogenic addiction. We report durable strong responses in four non-smoker women (A, B, C, D) and two smokers (E, F) treated by ICIs in a second-line setting for NSCLC harboring METex14 mut.Method
We studied the clinical and biological characteristics and the tumor response after ICIs for each patient. The complete DNA sequencing of the tumor was available after the beginning of ICIs (explaining why crizotinib was not proposed in second line). PDL1 expression on tumor cells was evaluated by antibody clone E1L3N (Cell signaling Technology).Result
Table 1 summarizes patient and tumor characteristics, and the evolution during ICIs : Nivolumab for all patients except E (pembrolizumab). There were neither EGFR, BRAF, KRAS mutations, nor ALK or ROS translocations (except minority KRAS mutation for C). No concurrent MET amplification was found.
Partial or complete response was rapidly (2 months) obtained in five patients, while pseudo-progression was first observed in D. After a grade 3 diarrhea and diabetic ketoacidosis, ICI was stopped in A but the reintroduction one year later did not cause any toxicity. The tolerance was excellent for the 5 other patients. Response was maintained from 16 to 40 months and treatment is ongoing in four patients. C stopped ICI after 26 months (Complete response on PETscan). B had an isolated bone progression after 7 months of ICI which benefited from a local radiotherapy. After almost 2 years of ICI, a multisite progression occurred and crizotinib was proposed.
ICIs should be discussed in the treatment of METex14 mut NSCLC.