Prognostic value of the DNA integrity index in patients with malignant lung tumors

Dimple Y. Chudasama, Zeynep Aladag, Mayla I. Felicien, Marcia Hall, Julie Beeson, Nizar Asadi, Yori Gidron, Emmanouil Karteris, Vladimir B. Anikin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Introduction: Lung cancer survival remains poor in the western world due to late presentation in most cases, leading to difficulty of treatment in these advanced and metastatic patients. Therefore, the development of a robust biomarker for prognosis and to monitor treatment response and relapse would be of great benefit. The use of Alu repeats and DNA Integrity Index has been shown to hold both diagnostic and prognostic value, and as it is obtained from the plasma of patients, it can serve as a non-invasive tool for routine monitoring. This study evaluates the efficiency of this technique in malignant lung cancer patients. Methods: Plasma samples were collected from 48 patients, consisting of 29 lung cancer patients and 19 non-cancer controls. Alu repeat ratio and confounders were measured. Results: Observations showed a higher Alu repeat ratio amongst the cancer group compared to controls (p=0.035), mean Alu ratio 0.38 (range 0.01-0.93) and 0.22 (0.007-0.44) respectively, ROC curve analysis AUC 0.61 (p=0.22). Analysis by staging was more promising, whereby a higher DNA Integrity Index was seen in advanced cases compared to both early stage and controls, p < 0.0001; AUC: 0.92 (P=0.0002) and p=0.0006, AUC - 0.88 (p=0.0007) respectively, however no significant difference was observed in the early stage compared to controls. Short term survival data also showed a DNA Integrity Index of > 0.5 to be associated with poorer overall survival p=0.03. Conclusion: The results of this study show a potential use of Alu repeats ratios for prognostic purposes in the advanced setting for lung cancer patients.

Original languageEnglish
Pages (from-to)21281-21288
Number of pages8
JournalOncotarget
Volume9
Issue number30
DOIs
Publication statusPublished - 20 Apr 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© Chudasama et al.

Keywords

  • Alu repeats
  • Circulating tumour DNA
  • DNA integrity index
  • Liquid biopsy
  • Malignant lung tumours

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