KRAS and cancer: In two other studies, the Norgen Plasma/Serum Circulating DNA Purification Mini Kit yielded slightly better isolation results compared to the QIAamp kit depending on cancer type and used assay 9, while ctDNA in plasma samples of early stage (KRAS‐mutated) pancreatic cancer patients was not being detected using ddPCR after isolation with the QIAamp kit 35.