Cell-free DNA as biomarker and source for mutation detection in primary colorectal cancer.

Aleksandra Nikolic, Marina Vlajnic, Momcilo Ristanovic, Jelena Petrovic, Ivan Dimitrijevic, Zoran Krivokapic, Dragica Radojkovic,

Journal of B.U.ON. : official journal of the Balkan Union of Oncology, April 2, 2017

To analyze if cell-free (cf)DNA levels and the presence of KRAS and BRAF mutations in serum could be used as diagnostic biomarkers in patients with primary colorectal cancer (CRC). This study included 92 individuals who were operated due to primary CRC (N=52;study group) and to hemorrhoids (N=40;control group). Serum cfDNA levels were measured with real-time PCR (RT-PCR) using PicoGreen dsDNA quantitation reagent. Colorectal tissue and related blood and serum samples taken at the time of surgery were subjected to DNA extraction and analysis of KRAS and BRAF mutations based on multiplex SNaPshot assay and DNA sequencing. The average cfDNA concentration was lower in patients of the study group (20±7 ng/μL) in comparison to controls (34±9 ng/μL) and this difference was statistically significant (p

Pubmed Link: 28365952