Progression-Free Survival according to chemotherapy regimen. Conventional chemotherapy alone (CCA) in black or plus high-dose chemotherapy (HDC) in grey. (A) In patients under 50 years of age (n=52), median PFS was 11 months in the CCA subset versus 81.7 months in the HDC subset. (B) In patients older than 50 years old (n=111), median PFS was 18.3 months in the CCA subset versus 17.9 months in the HDC subset. + censored data.