EXCERPT

The new study is very small, but it aligns with other recent work comparing tissue and liquid-biopsy sequencing results. A paper from Northwestern researchers in August looking at these same two tests, for example, found that more than half of the mutations identified by one test did not show up in the other. Another study looking at a few especially important mutations (for many kinds of cancers) found the tests agreed 70.3 percent or 88.1 percent or 93.1 percent of the time, depending on the mutation.