Table of Contents
Journal of Cancer Research
Volume 2013, Article ID 818675, 8 pages
Research Article

Fecal Collection and Stabilization Methods for Improved Fecal DNA Test for Colorectal Cancer in a Screening Setting

ISPO, Cancer Prevention and Research Institute, Analytical and Biomolecular Cytology Unit, Via Cosimo il Vecchio 2, 50139 Florence, Italy

Received 10 April 2013; Revised 24 July 2013; Accepted 11 August 2013

Academic Editor: Mario Scartozzi

Copyright © 2013 Francesca Maria Carozzi and Cristina Sani. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Early detection of CRC and adenomas reduces CRC-related mortality. The optimal screening test for CRC is still a subject of debate, and molecular stool sample analysis could provide a valid alternative to conventional methods in terms of compliance and practicability. Seven fecal DNA storage systems were evaluated in two successive phases. In the first phase of the study was selected the preservative buffer able to ensure the best human DNA recovery. In the second phase was evaluated human DNA stability, amplificability and integrity in DNA extracted from selected buffer. Results showed that the best performance was obtained in samples stored in 100 mM EDTA buffer and Genefec buffer. Likewise buffer addition yielded a significant increase in DNA stability and integrity without PCR inhibition, compared to the matched aliquots with no buffer added. Our study shows that samples collected in stabilization solution stabilize DNA so that intact nucleic acids, are more effectively detectable in the molecular assay. DNA buffer preservation and storage conditions could be useful to guarantee the most consistent yield in human DNA. Stabilization buffer addition to stool samples prior to transport presents an easily implemented solution that appears to be highly effective. Overall DNA extracted from faeces preserved in preservative buffer can feasibility been used for molecular analysis leading to an increase of assay sensitivity.