RecruitingDrug trialSelf Reported Pain in Women While Undergoing Treatment for Non-metastatic Breast CancerThe overall purpose of this study is to investigate whether younger subjects report pain with pegfilgrastim (or biosimilar substitution) more often and/or at higher levels (greater intensity) than older subjects.This study will be carried out throughout the course of your chemotherapy treatment, which will be prescribed by your study doctor. Participation in this study will not affect your cancer treatment.