Liquid Biopsy vs Tissue Testing: What Each Sample Can Tell You
Tissue testing studies cells from a sampled lesion; liquid biopsy usually studies circulating tumour DNA in blood. These methods can complement each other, but each has distinct blind spots.
Quick Answer
Tissue testing studies cells from a sampled lesion; liquid biopsy usually studies circulating tumour DNA in blood. These methods can complement each other, but each has distinct blind spots.
Different Sampling Windows
A tissue biopsy can provide morphology and local tumour context. A blood test can sample DNA shed from more than one site, but shedding varies between tumours and disease states.
A Negative Result Has Boundaries
A negative ctDNA result may reflect low detectable tumour DNA rather than confirmed absence of a variant. Assay sensitivity and sample timing should be read with the result.
Key Takeaways
- ·Tissue and blood testing answer overlapping but different questions.
- ·ctDNA sensitivity depends on tumour DNA shedding.
- ·Sample type is part of molecular interpretation.
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Frequently asked questions
What is the key idea in Liquid Biopsy vs Tissue Testing: What Each Sample Can Tell You?
Tissue testing studies cells from a sampled lesion; liquid biopsy usually studies circulating tumour DNA in blood. These methods can complement each other, but each has distinct blind spots.
What should be kept with the result or mechanism?
Tissue and blood testing answer overlapping but different questions. ctDNA sensitivity depends on tumour DNA shedding. Sample type is part of molecular interpretation.
References
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