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 Cancerjournal_title
International journal of cancerauthors
Reduzzi C,Vismara M,Silvestri M,Celio L,Niger M,Peverelli G,De Braud F,Daidone MG,Cappelletti Vdoi
10.1002/ijc.32822subject
Has Abstractpub_date
2020-06-15 00:00:00pages
3495-3503issue
12eissn
0020-7136issn
1097-0215journal_volume
146pub_type
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