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Published in: Journal of Neuro-Oncology 3/2020

Open Access 01-07-2020 | Magnetic Resonance Imaging | Clinical Study

Cerebrospinal fluid circulating tumor cells as a quantifiable measurement of leptomeningeal metastases in patients with HER2 positive cancer

Authors: Rachna Malani, Martin Fleisher, Priya Kumthekar, Xuling Lin, Antonio Omuro, Morris D. Groves, Nancy U. Lin, Michelle Melisko, Andrew B. Lassman, Suriya Jeyapalan, Andrew Seidman, Anna Skakodub, Adrienne Boire, Lisa M. DeAngelis, Marc Rosenblum, Jeffrey Raizer, Elena Pentsova

Published in: Journal of Neuro-Oncology | Issue 3/2020

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Abstract

Purpose

The CellSearch® system has been used to identify circulating tumor cells (CTCs) in cerebrospinal fluid (CSF) to diagnose leptomeningeal metastasis (LM) in patients with epithelial cancers. Using this system, we prospectively explored sequential CSF CTC enumeration in patients with LM from HER2+ cancers receiving intrathecal (IT) trastuzumab to capture dynamic changes in CSF CTC enumeration.

Methods

CSF from patients enrolled in an IRB-approved phase I/II dose escalation trial of IT trastuzumab for LM in HER2+ cancer (NCT01325207) was obtained on day 1 of each cycle and was evaluated by the CellSearch® platform for CTC enumeration. The results were correlated with CSF cytology from the same sample, along with clinical and radiographic response.

Results

Fifteen out of 34 patients with HER2+ LM were enrolled in CSF CTC analysis; 14 were women. Radiographic LM was documented in 14 (93%) patients; CSF cytology was positive in 6 (40%) and CSF CTCs were identified in 13 (87%). Median CSF CTC was 22 CTCs (range 0–200 +) per 3 ml. HER2/neu expression analysis of CTCs was performed in 8 patients; 75% had confirmed expression of HER2/neu positivity in CSF and HER2/neu expression was absent in 25%. Four of 10 patients received 7 or more cycles of IT trastuzumab; in 3 of these patients, increase in CSF CTCs enumeration from baseline was detected 2–3 months prior to changes seen on MRI, and while CSF cytology remained negative.

Conclusion

Our study demonstrates that enumeration of CSF CTCs may provide dynamic, quantitative assessment of tumor burden in the central nervous system compartment during treatment for LM and prior to changes on MRI or CSF cytology.
Trial Registration: Clinicaltrials.gov: NCT01325207; registered March 29th, 2011.
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Metadata
Title
Cerebrospinal fluid circulating tumor cells as a quantifiable measurement of leptomeningeal metastases in patients with HER2 positive cancer
Authors
Rachna Malani
Martin Fleisher
Priya Kumthekar
Xuling Lin
Antonio Omuro
Morris D. Groves
Nancy U. Lin
Michelle Melisko
Andrew B. Lassman
Suriya Jeyapalan
Andrew Seidman
Anna Skakodub
Adrienne Boire
Lisa M. DeAngelis
Marc Rosenblum
Jeffrey Raizer
Elena Pentsova
Publication date
01-07-2020
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 3/2020
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-020-03555-z

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