CSF2 and cancer: FN is a frequent and life-threatening complication of cancer chemotherapy, which can be partially prevented by the prophylactic use of haematopoïetic growth factors (G-CSG or GM-CSF) or by a reduction of the dose of chemotherapy (The American Society of Clinical Oncology, 1994; Blay et al, 1995; Boogaerts et al, 1995; Bennett et al, 1999).