Despite patient interest and marketing, clinical experts are cautious about routine ctDNA use in endometrial cancer. They struggle with interpreting results, worrying that a positive test could lead to unnecessary anxiety and premature or excessive treatment without clear evidence of benefit.

Despite emerging trial data, clinicians are not yet ready to change therapy based on ctDNA positivity alone. Key concerns cited include the absence of a proven survival benefit from early intervention, the potential to use future treatment lines prematurely, and overall feasibility. The consensus is that while promising, the technology is not yet ready for routine clinical decision-making.

While not yet validated, ctDNA is being used by clinical experts as a de-escalation tool to provide confidence when stopping long-term maintenance therapies like PARP inhibitors. This novel application focuses on reducing treatment burden rather than solely detecting disease progression.

While ctDNA testing offers powerful prognostic information, some patients decline it. The key reason is the anxiety associated with receiving a positive result after adjuvant therapy when there is no standard-of-care intervention for MRD positivity. For these patients, the psychological burden of knowing about likely recurrence without a clear action plan outweighs the benefit.

An expert oncologist advises against ordering ctDNA tests that merely provide a "good or a bad feeling" about prognosis. The most valuable use is when a positive or negative result clearly dictates a clinical action, such as when to stop or restart adjuvant therapy.

The ideal use for cell-free DNA tests is tracking 'minimal residual disease' in patients already treated for cancer. In this high-risk group, the base rate of recurrence is much higher, making a positive test result far more reliable and actionable for early intervention.

Unlike immunotherapy, where ctDNA clearance strongly predicts good outcomes, chemotherapy can cause a temporary decrease in ctDNA that doesn't correlate with long-term survival. This "smudging" effect complicates ctDNA interpretation for patients receiving chemo-immunotherapy combinations.

A negative liquid biopsy (ctDNA) result for HER2 amplification does not prove a patient is HER2-negative. The test's sensitivity is limited by tumor fraction in the blood. While a positive ctDNA result is highly specific and trustworthy, a negative result is simply 'not detected' and requires a tissue biopsy to definitively determine HER2 status for treatment decisions.

Contrary to some physicians' concerns, patient survey data shows that over 80% value ctDNA testing. They perceive it not as a source of anxiety, but as a way to be proactive in their care. This finding dismantles a key argument used by some clinicians to resist adoption.