Circulating tumor cell analysis in metastatic triple-negative breast cancers.

Published

Journal Article

PURPOSE: Recent developments in rare-cell technology have led to improved blood-based assays that allow for the reliable detection, enumeration, and more recently, genomic profiling of circulating tumor cells (CTC). We evaluated two different approaches for enumeration of CTCs in a prospective therapeutic study of patients with metastatic triple-negative breast cancer (TNBC). EXPERIMENTAL DESIGN: The CellSearch system, a commercially available and U.S. Food and Drug Administration (FDA)-cleared assay for CTC enumeration, and IE/FC, an alternative method using EPCAM-based immunomagnetic enrichment and flow cytometry that maintains cell viability, were used to enumerate CTCs in the blood of patients with metastatic TNBC. CTC numbers were assessed at baseline and 7 to 14 days after initiation of therapy with cetuximab ± carboplatin in a phase II multicenter clinical trial (TBCRC 001). RESULTS: CTC numbers from two methods were significantly correlated at baseline (r = 0.62) and at 7 to 14 days (r = 0.53). Baseline CTCs showed no association with time-to-progression (TTP), whereas CTCs at 7 to 14 days were significantly correlated with TTP (CellSearch P = 0.02; IE/FC P = 0.03). CTCs at both time points were significantly associated with overall survival (OS) [CellSearch: baseline (P = 0.0001) and 7 to 14 days (P < 0.0001); IE/FC: baseline (P = 0.0009) and 7 to 14 days (P = 0.0086)]. CONCLUSIONS: Our findings demonstrate that CTC enumeration by two different assays was highly concordant. In addition, results of both assays were significantly correlated with TTP and OS in patients with TNBC. The IE/FC method is also easily adapted to isolation of pure populations of CTCs for genomic profiling.

Full Text

Duke Authors

Cited Authors

  • Magbanua, MJM; Carey, LA; DeLuca, A; Hwang, J; Scott, JH; Rimawi, MF; Mayer, EL; Marcom, PK; Liu, MC; Esteva, FJ; Park, JW; Rugo, HS; Translational Breast Cancer Research Consortium,

Published Date

  • March 1, 2015

Published In

Volume / Issue

  • 21 / 5

Start / End Page

  • 1098 - 1105

PubMed ID

  • 25524311

Pubmed Central ID

  • 25524311

International Standard Serial Number (ISSN)

  • 1078-0432

Digital Object Identifier (DOI)

  • 10.1158/1078-0432.CCR-14-1948

Language

  • eng

Conference Location

  • United States