Patienten må ikke blive behandlet med vækstfaktorer, fx G- CSF, i 2 uger før behandlingen med Zevalin og i 2 uger efter afslutningen af behandlingen, da hurtigt delende myeloide celler er potentielt sensive over for stråling..
Patients should not receive growth factor treatment such as G-CSF for 2 weeks prior to Zevalin treatment as well as for 2 weeks following completion of the regimen because of the potential sensitivity of rapidly dividing myeloid cells to radiation.