Ve studii fáze Ib nebyl pozorován žádný signifikantní vliv gemcitabinu na farmakokinetiku erlotinibu ani signifikantní vliv erlotinibu na farmakokinetiku gemcitabinu.
In a Phase Ib study, there were no significant effects of gemcitabine on the pharmacokinetics of erlotinib nor were there significant effects of erlotinib on the pharmacokinetics of gemcitabine.