DNA methylation markers for sensitive detection of circulating tumor DNA in plasma from patients with gastroesophageal adenocarcinomas (AACR 2023)
In tumor tissue, methylated copies were detected in all 29 surgical samples (100% sensitivity), with varying allele frequencies. In plasma, methylated copies were detected in 14 out of 18 samples (78% sensitivity) from patients with advanced disease, with varying sensitivity amongst the three markers (AUC for the three markers CLIP4, C9orf50, and KCNQ5 was 0.61, 0.86, and 0.94, respectively). In plasma from patients with resectable disease, methylated copies were detected in 10 of 17 samples (59% sensitivity), although only 7/17 (41% sensitivity) were positive according to the predefined cut-off.