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GU Cancers 2026 | MONSTAR-SCREEN-3: ultra-sensitive ctDNA detection in urothelial cancer

Taigo Kato, MD, PhD, The University of Osaka, Osaka, Japan, discusses the MONSTAR-SCREEN-3 study (UMIN000053975) evaluating a tumor-informed whole-genome sequencing-based circulating tumor DNA (ctDNA) assay for molecular residual disease detection in resectable urothelial cancer. This prospective analysis demonstrated technical feasibility, with the ultra-sensitive platform detecting ctDNA in all evaluable baseline cases, including low-shedding tumors. This interview took place at the 2026 ASCO GU Cancers Symposium in San Francisco, CA.

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Transcript

CDNA and positivity are a hazardous promising biomarker for MLT unit status. A previous study demonstrated the association between MLT positivity and recurrence risk. However, only a few data are available in venous recurrent genome. So we launched a prospective multi-center trial, also a screening trial, which performs ultra-sensitive next-generation sequence-based MLDR assay in solid tumors...

CDNA and positivity are a hazardous promising biomarker for MLT unit status. A previous study demonstrated the association between MLT positivity and recurrence risk. However, only a few data are available in venous recurrent genome. So we launched a prospective multi-center trial, also a screening trial, which performs ultra-sensitive next-generation sequence-based MLDR assay in solid tumors. So as a result, we can, you know, detect 100% positivity at baseline and at 11.1% at one month post-surgery with 50 percent detectable at ultra-sensitive levels and also we found ctDNA levels were closely associated with, you know, stage or tumor size or, you know, lymph node status and finally we found that patients with recurrent disease had persisted ctDNA-positive after the surgery. So in the end, all together, these findings indicate that a next-generation sequence-based approach is very feasible and may predict recurrence after the surgery in the audits and bibliographic examinations.

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