OUTLINE: Patients and participants undergo assessment of treatment-related fatigue and cognitive dysfunction (i.e., mental fatigue) at baseline, after completion of 3-4 courses of standard adjuvant chemotherapy, and 1-3 weeks after completion of the most recent treatment. Patient recovery will be assessed at approximately 1 year from baseline. Study assessments will include a brief fatigue inventory, a cognitive assessment, and muscle fatigability testing through a sustained isometric contraction. Additional assessments will include quantification of brain and muscle signal alterations in patients with and without treatment-related fatigue and cognitive-assessment testing in patients experiencing chemotherapy-related cognitive dysfunction.