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Monitoring Circulating Tumor Cells With the CellSearch(R) System Can Predict Prognosis in Metastatic Breast Cancer
Date:7/13/2009

ons," said Ken Berlin, general manager of Veridex. "This study demonstrates the utility of integrating the CellSearch(R) CTC test in therapeutic monitoring of patients with metastatic disease."

Study Design

A retrospective study was performed on 115 patients with MBC who had the CellSearch test performed as part of their initial staging process at M.D. Anderson over a three-year period. CTC count and FDG-PET/CT imaging were performed at baseline in 102 evaluable patients before starting a new therapy and then again at the midpoint of their therapies (9 - 12 weeks). Patients outcomes were categorized according to midtherapy CTC counts as favorable (< five CTCs/7.5 mL blood) or unfavorable (greater than or equal to five CTCs/7.5 mL blood). Based on FDG-PET/CT, patients were considered responders if metabolic activity of target lesions decreased more than 25% compared to baseline, and if there was no change or a decrease in size. Patients were considered nonresponders if the FDG uptake was similar or higher and/or if target lesions had increased in size. CTC counts and FDG-PET/CT response at midtherapy were compared, and univariate and multivariate analyses were performed to identify factors associated with survival.

Study Findings

A total of 115 patients with MBC were considered for the study and 102 were evaluable for efficacy. The median overall survival time was 14 months (range, 1 to > 41 months). In univariate analysis, both midtherapy CTC counts and FDG-PET/CT response predicted overall patient survival (p<.001 and p=.001, respectively). The overall concordance between the CTC counts at midtherapy and FDG-PET/CT was 67% for response/nonresponse and 74% for progression/nonprogression. In the discordant category, detection of five or more CTCs during therapeutic monitoring accurately predicted prognosis in MBC beyond metabolic response. FDG-PET/CT was able to predict outcome in discordant
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SOURCE Veridex, LLC
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