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Impact of Smoking and Brain Metastasis on Outcomes of Advanced EGFR Mutation Lung Adenocarcinoma Patients Treated with First Line Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors.
- Source :
-
PloS one [PLoS One] 2015 May 08; Vol. 10 (5), pp. e0123587. Date of Electronic Publication: 2015 May 08 (Print Publication: 2015). - Publication Year :
- 2015
-
Abstract
- Objectives: This purpose of this study was to examine clinical-pathologic factors--particularly smoking and brain metastases--in EGFR mutation positive (M(+)) lung adenocarcinoma (ADC) to determine their impact on survival in patients treated with first line EGFR TKI.<br />Methods: A retrospective review of EGFR mutation reflex testing experience for all ADC diagnosed at a tertiary Asian cancer centre from January 2009 to April 2013. Amongst this cohort, patients with advanced EGFR M(+) ADC treated with first line EGFR TKI were identified to determine factors that influence progression free and overall survival.<br />Results: 444/742 (59.8%) ADC reflex tested for EGFR mutations were EGFR M(+.) Amongst never-smokers (n=468), EGFR M(+) were found in 74.5% of females and 76.3% of males, and amongst ever smokers (n=283), in 53.3% of females and 35.6% of males. Exon 20 mutations were found more commonly amongst heavy smokers (> 50 pack years and > 20 pack years, Pearson's chi square p=0.044, and p=0.038 respectively). 211 patients treated with palliative first line TKI had a median PFS and OS of 9.2 and 19.6 months respectively. 26% of patients had brain metastasis at diagnosis. This was significantly detrimental to overall survival (HR 1.85, CI 1.09-3.16, p=0.024) on multivariate analysis. There was no evidence that smoking status had a significant impact on survival.<br />Conclusions: The high prevalence of EGFR M(+) in our patient population warrants reflex testing regardless of gender and smoking status. Smoking status and dosage did not impact progression free or overall survival in patients treated with first line EGFR TKI. The presence of brain metastasis at diagnosis negatively impacts overall survival.
- Subjects :
- Adenocarcinoma enzymology
Adenocarcinoma of Lung
Adult
Aged
Aged, 80 and over
Brain Neoplasms enzymology
Brain Neoplasms genetics
Cohort Studies
DNA Mutational Analysis
Demography
Disease Progression
Disease-Free Survival
ErbB Receptors antagonists & inhibitors
Female
Humans
Kaplan-Meier Estimate
Lung Neoplasms enzymology
Male
Middle Aged
Multivariate Analysis
Neoplasm Staging
Protein Kinase Inhibitors pharmacology
Reflex drug effects
Treatment Outcome
Adenocarcinoma drug therapy
Adenocarcinoma genetics
Brain Neoplasms secondary
ErbB Receptors genetics
Lung Neoplasms drug therapy
Lung Neoplasms genetics
Mutation genetics
Protein Kinase Inhibitors therapeutic use
Smoking adverse effects
Subjects
Details
- Language :
- English
- ISSN :
- 1932-6203
- Volume :
- 10
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- PloS one
- Publication Type :
- Academic Journal
- Accession number :
- 25955322
- Full Text :
- https://doi.org/10.1371/journal.pone.0123587