Platelet cloaking of circulating tumour cells in patients with metastatic prostate cancer: Results from ExPeCT, a randomised controlled trial

Lauren Brady, Brian Hayes, Gráinne Sheill, Anne-Marie Baird, Emer Guinan, Bryan Stanfill, Tatjana Vlajnic, Orla Casey, Verena Murphy, John Greene, Emma H Allott, Juliette Hussey, Fidelma Cahill, Mieke Van Hemelrijck, Nicola Peat, Lorelei Mucci, Moya Cunningham, Liam Grogan, Thomas Lynch, Rustom P ManeckshaJohn McCaffrey, Dearbhaile O'Donnell, Orla Sheils, John O'Leary, Sarah Rudman, Ray McDermott, Stephen Finn

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Abstract

BACKGROUND: Circulating tumour cells (CTCs) represent a morphologically distinct subset of cancer cells, which aid the metastatic spread. The ExPeCT trial aimed to examine the effectiveness of a structured exercise programme in modulating levels of CTCs and platelet cloaking in patients with metastatic prostate cancer.

METHODS: Participants (n = 61) were randomised into either standard care (control) or exercise arms. Whole blood was collected for all participants at baseline (T0), three months (T3) and six months (T6), and analysed for the presence of CTCs, CTC clusters and platelet cloaking. CTC data was correlated with clinico-pathological information.

RESULTS: Changes in CTC number were observed within group over time, however no significant difference in CTC number was observed between groups over time. Platelet cloaking was identified in 29.5% of participants. A positive correlation between CTC number and white cell count (WCC) was observed (p = 0.0001), in addition to a positive relationship between CTC clusters and PSA levels (p = 0.0393).

CONCLUSION: The presence of platelet cloaking has been observed in this patient population for the first time, in addition to a significant correlation between CTC number and WCC.

TRIAL REGISTRATION: ClincalTrials.gov identifier NCT02453139.

Original languageEnglish
Article numbere0243928
Number of pages15
JournalPLoS ONE
Volume15
Issue number12
DOIs
Publication statusPublished - 18 Dec 2020

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