Fig 7. Venn diagram of variant candidates found in 4-pair analyses of FFPE and frozen tissue DNA.

Variants identified in 4 matched FFPE-frozen pairs of normal liver tissues, h16, h17, h18 and h19. Fourteen variants were identified by pair analysis using Ion Reporter version 5.0 with the following filters: coverage more than 100, allele frequency more than 0.05, frozen allele coverage = 0. ERCC2 was a common variant among two samples, h16 and h17.