Agnieszka M Mazurek1, A Fiszer-Kierzkowska1, T Rutkowski2, K Składowski2, M Pierzyna1, D Scieglińska1, G Woźniak3, G Głowacki3, R Kawczyński3, E Małusecka1. 1. Center for Translational Research and Molecular Biology of Cancer, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice Branch, Gliwice, Poland. 2. I Radiotherapy Clinic, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice Branch, Gliwice, Poland. 3. Department of Radiotherapy, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice Branch, Gliwice, Poland.
Abstract
BACKGROUND: The precise analysis of tumour markers in blood such as circulating cell-free DNA (cfDNA) could have a significant impact in facilitating monitoring of patients after initial therapy. Although high levels of total cfDNA in plasma of cancer patients are consistently demonstrated, a low sensitivity of DNA alterations is reported. OBJECTIVE: The major question regards the recovery of tumour-specific cfDNA such as KRAS mutated DNA and cancer-associated type 16 of human papillomavirus (HPV16). METHODS: TaqMan technology was used for detection of KRAS mutation, HPV16 and to quantify cfDNA in blood plasma. RESULTS: Comparison of four different column-based commercial kits shows that the cfDNA purification carried out by the Genomic Mini AX Body Fluids kit and the QIAamp Circulating Nucleic Acid kit gave us the possibility to improve the sensitivity of detection of KRAS mutation and HPV16. The optimized method was used to follow the reduction in cancer-specific cfDNA after therapy. We found that large volume extractions with low volume of DNA eluate enabled trace amounts of tumour-specific cfDNA from cancer patients to be effectively identified. CONCLUSIONS: Data presented in this study facilitate detection of tumour-specific cfDNA and improve standards needed for the implementation of cfDNA technology into routine clinical practice.
BACKGROUND: The precise analysis of tumour markers in blood such as circulating cell-free DNA (cfDNA) could have a significant impact in facilitating monitoring of patients after initial therapy. Although high levels of total cfDNA in plasma of cancerpatients are consistently demonstrated, a low sensitivity of DNA alterations is reported. OBJECTIVE: The major question regards the recovery of tumour-specific cfDNA such as KRAS mutated DNA and cancer-associated type 16 of human papillomavirus (HPV16). METHODS: TaqMan technology was used for detection of KRAS mutation, HPV16 and to quantify cfDNA in blood plasma. RESULTS: Comparison of four different column-based commercial kits shows that the cfDNA purification carried out by the Genomic Mini AX Body Fluids kit and the QIAamp Circulating Nucleic Acid kit gave us the possibility to improve the sensitivity of detection of KRAS mutation and HPV16. The optimized method was used to follow the reduction in cancer-specific cfDNA after therapy. We found that large volume extractions with low volume of DNA eluate enabled trace amounts of tumour-specific cfDNA from cancerpatients to be effectively identified. CONCLUSIONS: Data presented in this study facilitate detection of tumour-specific cfDNA and improve standards needed for the implementation of cfDNA technology into routine clinical practice.
Authors: Bi Wang; Lei Yu; Xin Luo; Lin Huang; Qin-Shan Li; Xiao-Shan Shao; Yi Liu; Yu Fan; Guo-Zhen Yang Journal: Oncol Lett Date: 2017-05-03 Impact factor: 2.967
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