September was an eventful month for one of the hottest products on the consumer genetic test market, the Cologuard multi-target stool DNA test (mtSDNA) for colorectal cancer screening produced by Exact Sciences. The month started badly with the release of a CMS-sponsored research report finding Cologuard “less effective and considerably more costly” than alternatives. Although Exact Sciences quickly criticized the report and its analytical methodology, its stock took a beating.