This excerpt taken from the EXAS 10-K filed Mar 15, 2006.
Extensions to other cancers. DNA Integrity Assay, or DIA®, is an epigenetic marker for the presence of cancer, as indicated by longer, less degraded strands of DNA. The presence of these longer strands of DNA is believed to be associated with escape from apoptosis (natural cell death), which itself is a hallmark of cancer. We have validated the DIA theory through collaboration with a bioinformatics company using a virtual model of cancer. In addition, several independent papers have been published that support our observations around DIA. We believe our proprietary DIA may potentially be applicable to the detection of other cancers in addition to colorectal cancer.