PFS according to the response to initial induction chemotherapy in patients who received transplants in CR and in PR. (A) Progression-free survival after high-dose radiochemotherapy followed by autologous stem cell transplantation (solid line) and interferon-α maintenance (broken line) in the subgroup of patients with CR following induction therapy. Patients assigned to stem cell transplantation experience significantly longer progression-free survival (log-rank test). (B) Progression-free survival after high-dose radiochemotherapy followed by autologous stem cell transplantation and interferon-α maintenance in the subgroup of patients with PR after induction therapy. Bars indicate 95% confidence interval.