Gefitinib induces cytostasis and differentiation in EGFR-deficient AML cells.
Gefitinib reduces cAMP level and increases ERK phosphorylation in AML cells.
Gefitinib modulates multiple GPCRs including histamine receptors.
H2R and H4R modulation suppresses gefitinib functions in AML cells.
H2R/H4R modulation also suppresses gefitinib effects in EGFR-rich cells.