Kaplan-Meier curves of disease-free survival in RARα1-PML mRNA (A) or RARα2-PML mRNA (B) expressors versus nonexpressors. The legend denominators indicate the number of protocol cases at risk in successive 6-month intervals up to 2.5 years of followup beginning from the time of the clinical diagnosis of complete remission. The legend numerators indicate the number of cases at risk that experienced adverse events leading to an off-protocol status (relapse or death).