[13C]-pantoprazole breath test to predict CYP2C19 phenotype and efficacy of a proton pump inhibitor, lansoprazole

Aliment Pharmacol Ther. 2009 Aug;30(3):294-300. doi: 10.1111/j.1365-2036.2009.04044.x. Epub 2009 May 18.


Background: (13)CO(2) is produced on metabolism of (13)C-labelled-pantoprazole ([(13)C]-pantoprazole) by CYP2C19.

Aim: To investigate whether the [(13)C]-pantoprazole breath test can predict CYP2C19 status and efficacy of proton pump inhibitors (PPIs) in Japanese.

Methods: We classified 110 healthy volunteers as rapid metabolizers (RM), intermediate metabolizers (IM) or poor metabolizers (PM) of CYP2C19 by genotyping. Breath samples were collected at 10-min intervals for 60 min after dosing with 100 mg [(13)C]-pantoprazole. Changes in the carbon isotope ratios ((13)CO(2)/(12)CO(2)) in carbon dioxide in breath samples were measured and expressed as a delta-over-baseline (DOB) ratio ( per thousand). Of the 110 subjects, twenty-two randomly selected subjects underwent intragastric pH monitoring on day 7 of dosing with 30 mg of lansoprazole.

Results: The DOB values of RMs were the highest and those of PMs the lowest of the three groups. Statistically significant differences were observed in the area-under-the-curve (AUC)(20-60 min) of DOB among the three groups. The mean 24-h intragastric pHs attained by lansoprazole 30 mg for 7 days were inversely correlated with the AUC(20-60 min) of DOB.

Conclusions: [(13)C]-pantoprazole breath test can easily estimate the individual activity of CYP2C19 and predict the efficacy of a PPI (i.e. lansoprazole). This test would be useful for individualized medicine with a PPI.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2-Pyridinylmethylsulfinylbenzimidazoles / pharmacology*
  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Anti-Ulcer Agents
  • Area Under Curve
  • Aryl Hydrocarbon Hydroxylases / metabolism*
  • Breath Tests
  • Cytochrome P-450 CYP2C19
  • Enzyme Inhibitors / pharmacology*
  • Female
  • Humans
  • Lansoprazole
  • Male
  • Middle Aged
  • Pantoprazole
  • Proton Pump Inhibitors / pharmacology*
  • Young Adult


  • 2-Pyridinylmethylsulfinylbenzimidazoles
  • Anti-Ulcer Agents
  • Enzyme Inhibitors
  • Proton Pump Inhibitors
  • Lansoprazole
  • Pantoprazole
  • Aryl Hydrocarbon Hydroxylases
  • CYP2C19 protein, human
  • Cytochrome P-450 CYP2C19