Fig. 2.

mVAF comparison by primary tumor site in stage IV disease. ctDNA levels were compared in patients with stage IV disease (n = 212) based on primary tumor site. Stage IV colorectal cancer had the highest level of ctDNA, followed by upper GI and HPB (41.1 ± 63.8, 24.1 ± 41.6, and 9.91 ± 23.9, respectively; p < 0.05). mVAF maximum variant allele frequency, ctDNA circulating tumor DNA, GI gastrointestinal, HPB hepato-pancreato-biliary