RRC ID 44002
Author Ito H, Inoue H, Sando N, Kimura S, Gohda K, Sato J, Murakami K, Ito S, Odaka N, Satodate H, Kudo SE.
Title Prognostic impact of detecting viable circulating tumour cells in gastric cancer patients using a telomerase-specific viral agent: a prospective study.
Journal BMC Cancer
Abstract BACKGROUND:The identification of circulating tumour cells (CTCs) in peripheral blood is a useful approach to estimate prognosis, monitor disease progression, and measure treatment effects in various malignancies. However, clinical relevance of CTCs is controversial. We attempted to detect viable CTCs in the peripheral blood of gastric cancer patients using a telomerase-specific viral agent.
METHODS:We took a 7.5-ml blood sample from 65 treatment-negative gastric cancer patients before surgery and 10 healthy volunteers. We detected viable CTCs in the blood samples after incubating them with a telomerase-specific, replication-selective, oncolytic adenoviral agent carrying the green fluorescent protein (GFP) gene (OBP-401). GFP-positive CTCs were defined as having a diameter of at least 7.735 μm; this threshold was determined by receiver operating characteristic curve analysis. GFP-positive cells were counted under a fluorescence microscope.
RESULTS:There was a significant difference in overall survival among the patients with 0-4 and those with ≥5 GFP-positive CTCs in the stage I-IV disease group and stage II-IV advanced disease group. The number of GFP-positive CTCs was not related to cancer stage. Among the pathological findings, the number of GFP-positive CTCs was only significantly related to venous invasion, although there were trends towards more GFP-positive CTCs with disease progression (tumour depth, lymph node metastasis, distant metastasis, lymphatic invasion, and histological type).
CONCLUSIONS:There was a significant relationship between the number of GFP-positive CTCs and overall survival in the patients with gastric cancer. The detection of CTCs using OBP-401 may be useful for prognostic evaluation.
TRIAL REGISTRATION:University Hospital Medical Information Network in Japan, UMIN000002018.
Volume 12
Pages 346
Published 2012-8-9
DOI 10.1186/1471-2407-12-346
PII 1471-2407-12-346
PMID 22873704
PMC PMC3495032
MeSH Adenoviridae / genetics* Adenoviridae / metabolism Adult Aged Case-Control Studies Female Fluorescent Dyes / chemistry Green Fluorescent Proteins / chemistry Green Fluorescent Proteins / genetics Humans Kaplan-Meier Estimate Male Middle Aged Neoplastic Cells, Circulating / pathology* Oncolytic Viruses / genetics* Oncolytic Viruses / metabolism Prognosis Prospective Studies ROC Curve Recombinant Fusion Proteins / chemistry Recombinant Fusion Proteins / genetics Stomach Neoplasms / blood* Stomach Neoplasms / diagnosis Stomach Neoplasms / pathology Stomach Neoplasms / virology Telomerase / metabolism*
IF 2.933
Times Cited 30
Human and Animal Cells