Primary circulating prostate cells are not detected in men with low grade small volume prostate cancer - Abstract

Objective: To determine if primary circulating prostate cells (CPCs) are found in all men with prostate cancer.

Methods and Patients: A prospective study, to analyze all men with an elevated PSA between 4.0 and 10.0 ng/mL undergoing initial biopsy. Primary CPCs were obtained by differential gel centrifugation and detected using standard immunocytochemistry using anti-PSA; positive samples underwent a second process with anti-P504S. A malignant primary CPC was defined as PSA (+) P504S (+) and a test positive if 1 cell/4 mL was detected. Biopsy results were registered as cancer/no-cancer, number of cores positive, and percent infiltration of the cores.

Results: 328/1123 (29.2%) of the study population had prostate cancer diagnosed on initial biopsy, and 42/328 (12.8%) were negative for primary CPCs. CPC negative men were significantly older, and had lower PSA levels, lower Gleason scores, and fewer positive cores and with infiltration by the cancer. 38/42 (91%) of CPC negative men complied with the criteria for active surveillance in comparison with 34/286 (12%) of CPC positive men.

Conclusions: Using primary CPC detection as a sequential test to select men with an elevated PSA for biopsy, the risk of missing clinically significant prostate cancer is minimal when the patient is primary CPC negative; less than 0.5% of all primary CPC negative men had a clinically significant prostate cancer.

Written by:
Murray NP, Reyes E, Fuentealba C, Orellana N, Jacob O.   Are you the author?
Hospital Carabineros of Chile, Nunoa, 7770199 Santiago, Chile; Circulating Tumor Cell Unit, Faculty of Medicine, University Mayor, Las Condes, 7550224 Santiago, Chile; Institute of Bio-Oncology, Providencia, 7500710 Santiago, Chile; Faculty of Medicine, Diego Portales University, Manuel Rodríguez Sur 415, 8370179 Santiago, Chile.

Reference: J Oncol. 2014;2014:612674.
doi: 10.1155/2014/612674

PubMed Abstract
PMID: 25210517 Prostate Cancer Section