The Effect of Pancreatic Juice Collection Time on the Detection of KRAS Mutations.

OBJECTIVE: Secretin-stimulated pancreatic juice is collected from the duodenum and analyzed to identify biomarkers of pancreatic neoplasia, but the optimal duration of pancreatic juice collection is not known.
METHODS: We compared the yield of KRAS mutations detected in pancreatic juice samples aspirated from near the duodenal papilla at 1 to 5, 6 to 10, and 11 to 15 minutes after secretin infusion, and from the third part of the duodenum (at 15 minutes) from 45 patients undergoing endoscopic ultrasound pancreatic surveillance. KRAS mutation concentrations were measured by using droplet digital polymerase chain reaction.
RESULTS: Forty of 45 patients had KRAS mutations detected in their pancreatic juice, and most patients' juice samples had more than 1 KRAS mutation. Of 106 KRAS mutations detected in 171 pancreatic juice samples, 58 were detected in the 5-minute samples, 70 mutations were detected in the 10-minute samples, and 65 were detected in the 15-minute samples. Nine patients who did not have KRAS mutations detected in their 5-minute sample had mutations detected in samples collected at later time points. Ninety-percent of all pancreatic juice mutations detected in any sample were detected in the 5- or 10-minute samples.
CONCLUSIONS: Collecting pancreatic juice for 10 minutes after secretin infusion increases the likelihood of detecting pancreatic juice mutations over shorter collections.