To support the hypothesis that the mPGES‐1 inhibitor 934 attenuates chemotherapy‐induced ABC transporter‐dependent drug resistance, drugs potentiated in the screen by 934 were also tested in the presence of verapamil, a calcium channel blocker and classical chemosensitizer known to decrease chemoresistance in various cancer cells including NB [40, 41]. This evidence concerns the gene PTGES and neuroblastoma.