A novel circulating tumor cell subpopulation for treatment monitoring and molecular characterization in biliary tract cancer.

Abstract:

:In biliary tract cancer (BTC), tissue biopsies to guide treatment are rarely feasible, thus implementing liquid biopsy approaches to improve patient management represents a priority. So far, studies on circulating tumor cells (CTCs) in BTC are insufficient to promote their use in patient clinical management and are limited to EpCAM-enriched CTCs evaluated with the CellSearch. We applied a single-cell protocol allowing identification not only of epithelial CTCs (eCTCs), but also of nonconventional CTCs (ncCTCs) lacking epithelial and leukocyte markers, but presenting aberrant genomes as confirmed by copy number alterations and therefore representing a distinct subpopulation of bona fide CTCs. In 41 blood samples longitudinally collected from 21 patients with advanced-stage BTC, addition of ncCTC to classic eCTC led to a CTC-positivity increase from 19% to 83%. Patients presenting with at least 1 eCTC/10 ml of blood at baseline prior to treatment start had a significantly shorter median disease-specific survival (DSS) compared to those lacking eCTCs (9 months vs. 19 months, p = 0.03 by log-rank test). No differences in DSS were observed according to ncCTC-positivity, conversely, variations in ncCTC counts during, and at the end of treatment, were associated with the RECIST response supporting their role in treatment monitoring. Moreover, in 88 ncCTCs collected at different times during treatment, unsupervised clustering evidenced segregation of cells by patient's best response, allowing identification of genomic regions possibly involved in resistance mechanisms. The presence of ncCTCs beside eCTCs opens the way to exploiting liquid biopsy for optimizing clinical management in BTC.

journal_name

Int J Cancer

authors

Reduzzi C,Vismara M,Silvestri M,Celio L,Niger M,Peverelli G,De Braud F,Daidone MG,Cappelletti V

doi

10.1002/ijc.32822

subject

Has Abstract

pub_date

2020-06-15 00:00:00

pages

3495-3503

issue

12

eissn

0020-7136

issn

1097-0215

journal_volume

146

pub_type

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