Abstract
Purpose
To investigate the diagnostic and prognostic value of circulating tumor cells (CTCs), a potential surrogate of micrometastasis, in malignant pleural mesothelioma (MPM).
Methods
We prospectively evaluated CTCs in 7.5 mL of peripheral blood sampled from patients with a suspicion of MPM. A semiautomated system was used to capture CTCs with an antibody against the epithelial cell adhesion molecule.
Results
Of 136 eligible patients, 32 were finally diagnosed with nonmalignant diseases (NM), and 104 had MPM. CTCs were detected in 32.7 % (34 of 104) of MPM patients but in only 9.4 % (3 of 32) of NM patients (P = 0.011). The CTC count was significantly higher in MPM patients than in NM patients (P = 0.007), and a receiver operating characteristic (ROC) curve analysis showed an insufficient capability of the CTC test in discrimination between MPM and NM, with an area under ROC curve of 0.623 (95 % confidence interval, 0.523–0.723; P = 0.036). Among MPM patients, CTCs were more frequently detected in patients with epithelioid subtype (39.7 %, 31 of 78) than in those with nonepithelioid subtypes (11.5 %, 3 of 26; P = 0.016). Positive CTCs (CTC count ≥1) were a significant factor to predict a poor prognosis among epithelioid patients (median overall survival, 22.3 months for positive CTCs vs. 12.6 months for negative CTCs; P = 0.004) and not in nonepithelioid patients (P = 0.649). A multivariate analysis showed that positive CTCs were a significant and independent factor to predict a poor prognosis (hazard ratio, 2.904; 95 % confidence interval, 1.530–5.511; P = 0.001) for epithelioid MPM patients.
Conclusions
CTC was a promising marker in diagnosis and prediction of prognosis in MPM, especially in epithelioid MPM.
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Acknowledgment
We thank Ms. Mayo Yamamoto for assistance in preparation of the manuscript. This study was supported by “The Special Coordination Funds for Promoting Science and Technology from the Japanese Ministry of Education, Culture, Sports, Science, and Technology,” “Grants-in-Aid for Scientific Research (KAKENHI B 24390335) from the Japan Society for the Promotion of Science (JSPS),” and “UOEH Grant for Advanced Research (H24-1) from University of Occupational and Educational Health, Japan.”
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Yoneda, K., Tanaka, F., Kondo, N. et al. Circulating Tumor Cells (CTCs) in Malignant Pleural Mesothelioma (MPM). Ann Surg Oncol 21 (Suppl 4), 472–480 (2014). https://doi.org/10.1245/s10434-013-3399-2
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DOI: https://doi.org/10.1245/s10434-013-3399-2