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The GPD1 gene can be amplified up to 30 years, the ACTB gene in the same samples up to 26 years and the RPL4 gene up to 6 years of storage in FFPE blocks. Although the best yield and purity of isolated DNA (using both isolation methods) was obtained from FFPE liver tissue, the DNA with the most preserved integrity was obtained from brain tissue archived up to 30 years. This is the first report using long-term archived healthy FFPE tissues (up to 30 years) that shows that the DNA isolated from these tissues is of preserved integrity and