Kaplan-Meier cumulative probability of neutrophil recovery ≥1,000/μL (A) and ≥500/μL (B) in G-CSF patients and controls. Tick marks indicate patients who have been censored because of death (+), because of G-CSF administration in the control group in case of a life-threatening infection in a severely neutropenic patient (*), or because of failure of recovery at day 28 (the numbers of these patients are indicated in parenthesis).