Abstract 417P
Background
An increasing amount of research suggests that the presence of minimal residual dis-ease (MRD) after curative-intent surgery for early-stage cancers is associated with disease recurrence. Circulating tumor DNA (ctDNA) has emerged as a promising biomarker for MRD assessment in patients with colorectal cancer (CRC) who have undergone surgery or completed adjuvant therapy. MRD tests are already available for use in clinics; however, treatment decisions following MRD results obtained in routine practice are infrequently described.
Methods
In this study, we report on the real-world clinical use of Guardant Reveal, a validated tissue-agnostic MRD assay which assesses genomic mutations as well as methylation sigantures, in the first 82 consecutive patients (102 samples) with CRC tested in Asia and the Middle East.
Results
Overall, 24% of patients had ctDNA detected in their first MRD test, and the frequency of ctDNA positivity increased with increasing tumor stage. Among all ctDNA-positive samples, 48% had evidence of MRD only through the detection of methylation signals, while 26% had both genomic alterations and methylation signals. In patients with stage II CRC, 78% of tests were ordered within 12 weeks after resection, while for patients with stage III disease, 63% of tests were ordered during surveillance. We also describe real-life clinical cases utilizing tissue-agnostic MRD assessment. Most of the physicians included MRD test results in the treatment pla.
Conclusions
Through retrospective analysis of real-world data, we describe how physicians in Asia and the Middle East currently apply a commercially available tissue-agnostic MRD assay in clinical decision-making for patients after surgical resection of colorectal cancer. The addition of methylation assessment to somatic mutation detection contributed to the detection of MRD in samples without mutation. Results from prospective randomized studies will further define the clinical role of MRD detection in resectable CRC. Evidence for tissue-agnostic MRD assays is building across tumor types with continuous improvements in sensitivity and specificity.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
S.S. Jain, S. Hsing, N. Joshi: Financial Interests, Personal, Full or part-time Employment: Guardant Health. All other authors have declared no conflicts of interest.
Resources from the same session
193P - Impact of coronavirus disease 2019 on patients with unresectable hepatocellular carcinoma treated with atezolizumab/bevacizumab
Presenter: Hongjae Chon
Session: Poster Display
Resources:
Abstract
194P - Real-world outcomes of cadonilimab (PD-1/CTLA-4 bispecific antibody) plus chemotherapy as first-line treatment in advanced gastric (G) or gastroesophageal junction (GEJ) cancer with PD-L1 CPS≤5
Presenter: Qi Xu
Session: Poster Display
Resources:
Abstract
195P - Ferroptosis signatures in pancreatic ductal adenocarcinomas and their role in patient survival: A translational unsupervised clustering analysis
Presenter: Quoc-Huy Trinh
Session: Poster Display
Resources:
Abstract
196P - Clinical significance of circulating CD8+ and CD4+ T cell proliferation in advanced gastric cancer receiving first-line chemotherapy
Presenter: In-Ho Kim
Session: Poster Display
Resources:
Abstract
197P - Treatment patterns and clinical outcomes of patients with unresectable advanced or metastatic (UAM) gastric/gastroesophageal junction adenocarcinoma (GA/GEJA) in China: A multicenter real-world study
Presenter: Yanqiao Zhang
Session: Poster Display
Resources:
Abstract
198P - Effectiveness of lenvatinib in patients with unresectable hepatocellular carcinoma: A multicenter observational study in Japan
Presenter: Namiki Izumi
Session: Poster Display
Resources:
Abstract
199P - Efficacy of endostar in combination with concurrent chemoradiotherapy in patients with locally advanced squamous cell carcinoma of esophagus: A randomized, open-label, phase II trial
Presenter: Yuexiao Qi
Session: Poster Display
Resources:
Abstract
200P - Prognosis of patients with hepatocellular carcinoma treated with transarterial chemoembolization: Development and validation of the ALFP score
Presenter: Baocuo Gong
Session: Poster Display
Resources:
Abstract
201P - A phase II study of serplulimab (a programmed death-1 inhibitor) with or without HLX04 (a bevacizumab biosimilar) for the treatment of advanced hepatocellular carcinoma
Presenter: Zhenggang Ren
Session: Poster Display
Resources:
Abstract
202P - Comparison of liver injury after transcatheter arterial chemoembolization and hepatic arterial infusion chemotherapy for intermediate and advanced hepatocellular carcinoma
Presenter: Yongru Chen
Session: Poster Display
Resources:
Abstract