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- W2321897075 abstract "A large amount of DNA of high quality is essential for molecular analysis. The amount of DNA in routine paraffin sections is small. Surgical specimens retained in formalin for the long-term (several months) left over from the sampling required for wax embedding can be referred to as “long-term formalin-fixed” specimens, and clearly this material is a rich source of DNA; however, it is difficult to extract. In the current study, we designed a microwave-heating method for DNA extraction from these specimens. We found that the heating procedure achieved greater DNA yields than a common nonheating method used for comparison (DNA contents mean±SD, heating 2.16±0.95 μg/μL vs. common 1.75±0.90 μg/μL, P<0.05). Fluorescence multiplex polymerase chain reaction-capillary electrophoresis successfully detected microsatellite instability (MSI) in the DNA samples derived from this heating procedure (98.4%, 689 of 700 sample tests), at significantly higher levels than from the conventional method (82.3%, 247 of 300 sample tests, P<0.05). We identified 10 (14.3%) MSI with high frequency and 6 (8.6%) MSI with low frequency colorectal cancers. MSI with high frequency cancers showed distinct clinicopathologic features including higher incidence of right-sided location, high histologic grade, mucin-production, and prominent intraepithelial lymphocyte infiltration. We concluded that the microwave-heating method was efficient for DNA isolation from long-term formalin-fixed tissue samples. The successful fluorescence multiplex polymerase chain reaction-capillary electrophoresis analysis in these samples might facilitate MSI detection in clinical practice." @default.
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- W2321897075 date "2012-10-01" @default.
- W2321897075 modified "2023-10-16" @default.
- W2321897075 title "Microwave Heating of Long-term Formalin-fixed Surgical Pathology Specimens Improves Quality of Extracted DNA" @default.
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- W2321897075 doi "https://doi.org/10.1097/pai.0b013e3182434174" @default.
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