Assertion: tissue biopsy | /r/HasAspect | insufficient material
Facets:
value: for dna testing
type: PURPOSE
Source sentences:
text: These tests are moving into widespread use when a tissue biopsy has insufficient material for DNA testing or when it is not safe to do an invasive biopsy procedure, according to a recent report of results on over 15,000 advanced cancer patients sequenced with the Guardant Health test.