Abstract 1408
Background
ALK-tyrosine kinase inhibitor (TKI) is associated with a favarable survival benefit in ALK-fusion patients in advanced non-small cell lung cancer (NSCLC). However, almost 20% patients with TKI early resistance (progression-free survival is shorter than six months while treated by either crizotinib or second-line TKIs), show a poor survival with no more than one year. The mechanisms of early resistance to TKIs are unknown. Reliable biomarkers are required to predict the response to ALK-TKIs, especially in the early resistance. So we investigated genomic variations associated with responses to crizotinib in advanced NSCLC patients with ALK-fusion.
Methods
Advanced NSCLC primary tumor samples with ALK-fusion from 5 extreme poor and 5 extreme strong responders to crizotinib were subjected to whole-genome analysis. And we found 44 genomic variant sites with poor response through gene based pathway enrichment analysis, Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis. Then we randomly assigned 17 advanced NSCLC patients’ sample with ALK-fusion to validate the candidate variant sites using small sequence capture panel. Genomic data of > 0.2 gigabases/sample was generated at average of 828 sequencing depth which covering 44 relative genes.
Results
In total, 774 genomic variations were matched to crizotinib responses in clinical data; which were located within regions for DNA repaired, mitochondrial apoptosis and tumor angiogenesis-target genes. From them, 4 DNA damage repair (DDR)-related gene variations (TP53, MLH1, XPA, and MSH2) were associated with early resistance to crizotinib in ALK-fusion NSCLC patients, from which 5 variants were within the coding regions and 4 identified as non-synonymous single-nucleotide variants. Validation genotyping confirmed sequencing results and revealed patients genotype for rs28934575 in TP53 showed extreme shorter PFS (P < 0.002) to crizotinib and poor survival, while the median PFS was 3 months (range, 2-5 months, 95% CI:2.2-3.8 months). And these patients survived no more than 12 months.
Conclusions
Thus, DDR deficiency may contribute to the early resistance to crizotinib in ALK-fusion patients.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
4325 - Multiple synchronous mechanisms may contribute to osimertinib resistance in non-small cell lung cancer (NSCLC) patients: insights of the MATCH-R study
Presenter: Diego Enrico
Session: Poster Display session 1
Resources:
Abstract
2185 - Sequential treatment with afatinib followed by 3rd generation EGFR-TKI – subgroup analysis of the GIDEON trial: a prospective non-interventional study (NIS) in EGFR mutated NSCLC patients in Germany
Presenter: Wolfgang Brückl
Session: Poster Display session 1
Resources:
Abstract
1524 - Effectiveness of sequencing TKIs in patients with EGFR mutation-positive Non-small-Cell Lung Cancer (NSCLC): A French National medico administrative claim database analysis
Presenter: Nicolas Girard
Session: Poster Display session 1
Resources:
Abstract
5733 - Phase II study of osimertinib in NSCLC patients with EGFR exon 20 insertion mutation: A multicenter trial of the Korean Cancer Study Group (LU17-19)
Presenter: Tae Min Kim
Session: Poster Display session 1
Resources:
Abstract
5440 - Different stories for different EGFR exon 19 deletion variants
Presenter: Chao Zhao
Session: Poster Display session 1
Resources:
Abstract
2982 - Safety and activity of alflutinib in patients with advanced EGFR T790M mutation non-small cell lung cancer who progressed after EGFR-TKI therapy
Presenter: Yuan-Kai Shi
Session: Poster Display session 1
Resources:
Abstract
4002 - Afatinib followed by osimertinib in patients with EGFR mutation-positive (EGFRm+) advanced NSCLC: updated data from the GioTag real-world study
Presenter: Maximilian Hochmair
Session: Poster Display session 1
Resources:
Abstract
2941 - Treatment patterns of EGFR mt+ NSCLC IV pts: Real world data of the NOWEL network
Presenter: Julia Roeper
Session: Poster Display session 1
Resources:
Abstract
4154 - TP53 mutations predicts worse prognosis in EGFR-mutated NSCLC patients receiving TKIs in first- or further line of treatment
Presenter: Matteo Canale
Session: Poster Display session 1
Resources:
Abstract
1175 - HER3 ligand heregulin expression and clinical implication in patients with epidermal growth factor receptor (EGFR)-mutant non-small cell lung cancer treated with EGFR-tyrosine kinase inhibitors
Presenter: Kimio Yonesaka
Session: Poster Display session 1
Resources:
Abstract