Generally, TumorMarker is different from CancerGenomicsReport in the following way:
TumorMarker covers certain serum-based tumor markers, as well as probe tests which are run by more common reference labs (e.g.: LabCorp, Quest). It is meant to address single tests which are returned as an observation/result pair.
While there are some probe-tests (e.g.: HER2 FISH) which could be found in a genomics report as well as in a simple HL7v2 message or FHIR Observation resource, the modelers made a pragmatic decision not to retrofit the complex modeling required for a genomics sequencing report just to accomodate a minimal set of elements received for a FISH, IHC, or CISH test to name a few.
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