FGFR1 and leukemia: The FGFR1 fusion proteins more frequently present in certain type of leukemia and lymphomas correlated with the 8p11 myeloproliferative syndrome are ZMYM2-FGFR1, Bcr-FGFR1, CEP110-FGFR1, FGFR1OP2-FGFR1, FOP-FGFR1 and CUX1-FGFR1, which are constitutively activated.