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
3620 - Safety, efficacy, PK and PD biomarker results of the first-in-human study of mutant isocitrate dehydrogenase 1 (mIDH1) inhibitor BAY 1436032 in patients (pts) with mIDH1 advanced solid tumours
Presenter: Wolfgang Wick
Session: Poster Display session 1
Resources:
Abstract
5465 - Proof of concept clinical study by US-guided intratumor injection of VCN-01, an oncolytic adenovirus expressing hyaluronidase in patients with pancreatic cancer
Presenter: Manuel Hidalgo
Session: Poster Display session 1
Resources:
Abstract
2555 - A Phase 1a/b first-in-human, open-label, dose-escalation, safety, PK and PD study of TP-0903 in solid tumors
Presenter: John Sarantopoulos
Session: Poster Display session 1
Resources:
Abstract
3533 - First in human phase 1/2a study of PEN-866, a Heat Shock Protein 90 (HSP90) ligand – SN38 conjugate for patients with advanced solid tumors: Phase 1 results
Presenter: Johanna Bendell
Session: Poster Display session 1
Resources:
Abstract
4114 - A Phase I Open-Label, Non-Randomized Study of Recombinant Super-Compound Interferon (rSIFN-co) In Patients with Advanced Solid Tumors
Presenter: Amanda Seet
Session: Poster Display session 1
Resources:
Abstract
2537 - Evaluation of Pharmacodynamic (PD) Biomarkers in Advanced Cancer Patients Treated with Oxidative Phosphorylation (OXPHOS) Inhibitor, OPC-317 (OPC)
Presenter: Jie Qing Eu
Session: Poster Display session 1
Resources:
Abstract
5764 - Pharmacokinetic (PK) assessment of BT1718: A phase 1/2a study of BT1718, a first in class Bicycle Toxin Conjugate (BTC), in patients (pts) with advanced solid tumours
Presenter: Natalie Cook
Session: Poster Display session 1
Resources:
Abstract
2683 - A phase I open label dose escalation trial evaluating VT1021 in patients with advanced solid tumors.
Presenter: Wael Harb
Session: Poster Display session 1
Resources:
Abstract
3609 - Interim Results from Trial of SL-801, a Novel XPO-1 Inhibitor, in Patients with Advanced Solid Tumors
Presenter: Judy Wang
Session: Poster Display session 1
Resources:
Abstract
3485 - Phase 1 Trial of Fruquintinib in Patients with Advanced Solid Tumors: Results of the Dose Escalation Phase
Presenter: Andrea Wang-Gillam
Session: Poster Display session 1
Resources:
Abstract