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MRD Watch

Sunday, November 15, 2026

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Independent briefing

Molecular residual disease across cancers, one sourced line at a time.

A daily briefing of sourced, fact-only updates on molecular residual disease, ctDNA, and MRD-relevant biomarkers across cancer types. Edited by Alan Tan, a genitourinary hematologist-oncologist. MRD and biomarker items are listed ahead of other news from the same stretch of days.

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Edited by Alan Tan, MD
How a minimal residual disease test worksA tumor sheds DNA fragments into a blood draw and a urine sample. Sequencing finds those tumor fragments among normal DNA. After treatment, the result can read ctDNA detected or not detected.Tumor sheds DNABlood drawUrine sampleTumor DNA stands outTumorNormalAfter treatmentctDNA detectedNot detected

How it works

A clear scan can still miss what is left

Drawn scanNo evidence of diseaseCells a scan does not show
The drawing starts as a clear scan labeled no evidence of disease, then shows small marks for residual cells.

“No evidence of disease” means the scan did not show a tumor. Alan Tan, MD, puts the gap this way, as an illustration rather than a cutoff: “To the human eye, a clear scan can still hide around 200 million cancer cells.” MRD testing, especially ultrasensitive MRD, looks for that leftover signal in blood.

How testing works

Today

Nov 15, 2026 ET

No update is dated today. The latest verified items are below, with MRD and biomarker reports ranked first.

Leading updates

Pinned items, then MRD and biomarker reports, then newer dates.

High-grade ovarian cancer: ctDNA positivity after frontline therapy independently tracked with shorter PFS

An ASCO 2026 retrospective cohort of 72 patients with high-grade epithelial ovarian cancer, 69 of whom were in clinical remission, found ctDNA positivity in 30 and second-look laparoscopy positivity in 33; on multivariable analysis ctDNA positivity predicted shorter progression-free survival (HR 4.35; 95% CI 2.17 to 8.72).

Journal of Clinical Oncology

Recent

The leading list already holds every item on file.