Purpose Erlotinib depends on stomach pH for its bioavailability. When erlotinib is taken concurrently with a proton pump inhibitor (PPI), stomach pH increases, which results in a clinically relevant decrease of erlotinib bioavailability.Wehypothesized that this drug-drug interaction is reversed by taking erlotinib with the acidic beverage cola. The effects of cola on erlotinib bioavailability in patients not treated with a PPI were also studied. Patients and Methods In this randomized, cross-over, pharmacokinetic study in patients with non-small-cell lung cancer, we studied intrapatient differences in absorption (area under the plasma concentration time curve [AUC0-12h]) after a 7-day period of concomitant treatment with erlotinib, with or without esomeprazole, with either colaorwater.At the7thand14thday, patientswerehospitalized for 1 day for pharmacokinetic sampling. Results Twenty-eight evaluable patients were included in the analysis. In patients treated with erlotinib and esomeprazole with cola, the mean AUC0-12h increased 39% (range, 212% to 136%; P = .004), whereas in patients not treated with the PPI, the mean AUC0-12h was only slightly higher (9%; range, 210% to +30%; P = .03) after erlotinib intake with cola. Conclusion Cola intake led to a clinically relevant and statistically significant increase in the bioavailability of erlotinib during esomeprazole treatment. In patients not treatedwith the PPI, the effects of colaweremarginal. These findings can be used to optimize the management of drug-drug interactions between PPIs and erlotinib.

dx.doi.org/10.1200/JCO.2015.65.2560, hdl.handle.net/1765/85684
Journal of Clinical Oncology
Erasmus MC: University Medical Center Rotterdam

van Leeuwen, R.W.F, Peric, R, Hussaarts, K.G.A.M, Kienhuis, E, IJzerman, N.S, de Bruijn, P.J, … Mathijssen, A.H.J. (2016). Influence of the acidic beverage cola on the absorption of erlotinib in patients with non-small-cell lung cancer. Journal of Clinical Oncology, 34(12), 1309–1314. doi:10.1200/JCO.2015.65.2560