Abstract: The disclosed technology relates to a method of analyzing DNA from a biological sample. In one aspect, the method comprises obtaining a sample a sample from a subject, the sample comprising DNA that comprises double-stranded DNA (dsDNA) suspected of having one or more thymine lesions formed by deamination of 5-methylcytosines, wherein the thymine lesions form base pair mismatches in the dsDNA, contacting the sample with a nuclease that digests dsDNA at base pair mismatches; harvesting DNA from the nuclease-treated sample; and performing an analysis on undigested DNA harvested from the nuclease-treated sample.

Abstract: The disclosed technology relates to a method of analyzing a tissue sample. In one aspect, the method comprises obtaining a formalin-fixed paraffin-embedded (FFPE) tissue sample; contacting the tissue sample with Mung Bean Nuclease to cleave mismatched DNA pairs when isolating DNA from the tissue sample; and performing an analysis on the non-digested DNA. In one embodiment, the tissue sample is obtained from a patient having a refractory disease or a cancer during biopsy, and the analysis comprises performing next-generation DNA sequencing to evaluate genomic DNA mutations. In another embodiment, the method further comprises using a computer to screen for one or more therapies according to the cancer diagnosis; and producing a computer-generated report of possible therapies.