Omega-3 Fatty Acids in Preventing Joint Symptoms in Patients With Stage I-III Breast Cancer Receiving Anastrozole, Exemestane, or Letrozole

OBJECTIVES: I. To assess the feasibility of evaluating joint symptoms in postmenopausal women with breast cancer randomized to n-3 PUFA (omega-3 fatty acid) vs. placebo supplementation using the Functional Assessment of Cancer Therapy-Breast (FACT-B) and endocrine subscale (FACT-ES), Brief Pain Inventory (BPI) and Stanford's Health Assessment -Disability Index (HAS) during the first 6 months of adjuvant aromatase inhibitor (AI) therapy. II. To preliminarily evaluate the efficacy of n-3 PUFA vs. placebo supplementation on AI induced joint symptoms. III. To explore blood and imaging based biomarkers (plasma and red blood cell \[RBC\] levels of n-3 PUFAs, inflammatory cytokines and receptors, and intra-articular tenosynovial inflammation by musculoskeletal magnetic resonance imaging \[MRI\] imaging) of AI-induced joint symptoms in women on AI therapy randomized to n-3 PUFAs vs. placebo supplementation. OUTLINE: Patients are randomized to 1 of 2 treatment arms. ARM I: Patients receive omega-3 fatty acid orally (PO) once daily (QD) for 6 months in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive placebo PO QD for 6 months in the absence of disease progression or unacceptable toxicity.