A review of the extant literature indicates that the incidence of G-CSF-associated vasculitis ranges from 0.4% to 2.7% [4-6]. However, subsequent reports, including this case, on prostate and bladder cancer patients not featured in those original studies indicate that this vasculitis may manifest across a broader spectrum of age, gender, and cancer types than previously recognized. The gene discussed is CSF3; the disease is cancer.