Kaplan-Meier curves showing the time to relapse dependent on patient age and HHV8 viral load. Gray solid line represents patients older than 50 years and undetectable plasma HHV8 viremia; gray hyphenated line, patients younger than 50 years and undetectable plasma HHV8 viremia; black solid line, patients older than 50 years and detectable plasma HHV8 viremia; and black hyphenated line, patients who were both younger than 50 years and had detectable plasma HHV8 viremia.