1. National Cancer Institute. NCI Dictionary of Cancer Terms. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/liquid-biopsy (Accessed April 23, 2018)
2. A case of cancer in which cells similar to those in the tumors were seen in the blood after death;Ashworth;Aust Med J,1869
3. Detection of hematogenous micrometastasis in patients with prostate cancer;Moreno;Cancer Res,1992
4. Reverse transcriptase polymerase chain reaction for prostate specific antigen in the management of prostate cancer;Gomella;J Urol,1997
5. Changes in circulating carcinoma cells in patients with metastatic prostate cancer correlate with disease status;Moreno;Urology,2001