3219793 PFSR progression-free survival rate 26 3219806 PFS-R Piper Fatigue Scale 14 3219805 PFS-R Piper Fatigue Scale-Revised 4 3219807 PFS-R Piper Fatigue Rating Scale 1 3219808 PFS-R progression-free survival after first recurrence 1 3219809 PFS-R progression-free survival in retreatment 1