Fig. 4: Potential application of ctDNA detection in post-surgery surveillance for patients with gastric cancer.

Detailed radiology results, ctDNA and CEA changes for patient P002 and P041 are shown. Dynamic changes of ctDNA (red line) and CEA (blue line), adjuvant chemotherapy with SOX regimen (gray box) and S-1 (yellow box) are shown at bottom panels. Representative radiology images are shown, including abdominal and pelvic CT scan, chest CT scan, PET-CT, and bone scan.