Samples from 13 patients with a BRAF or KRAS variant present in solid tumor tissue from melanoma (N = 8), colorectal adenocarcinoma (N = 3), or pancreatic ductal adenocarcinoma (N = 2) and a corresponding quantifiable variant present in ccfDNA by ddPCR were analyzed (Table 1). The gene discussed is KRAS; the disease is pancreatic ductal adenocarcinoma.