Abstract 3413: Supplement use and chemotherapy-induced peripheral neuropathy in breast cancer patients treated on SWOG study S0221

Introduction. Chemotherapy-induced peripheral neuropathy (CIPN) is a common side effect of paclitaxel treatment. There is conflicting data on the benefits and harms of supplement use for the treatment and prevention of CIPN. We examined dietary supplement use before diagnosis and during treatment in relation to CIPN among breast cancer patients registered to a clinical trial (SWOG 0221; ClinicalTrials.gov Identifier: NCT00070564) before diagnosis and during treatment in relation to CIPN. Methods. At trial registration (baseline), breast cancer patients (n = 1,225) completed questionnaires to capture use before and at diagnosis of multivitamins and other dietary supplements. Of these patients, 1,068 completed a 6-month follow-up questionnaire to capture use during treatment. We examined the use of multivitamins, vitamins C, D, E, B6, and B12, folic acid, iron, calcium, glucosamine, and combined fish oil, eicosapentaenoic acid (EPA), omega-3, flaxseed and cod liver oil at these timepoints in relation to CIPN. CIPN was assessed via the National Cancer Institute Common Toxicity Criteria for Adverse Events (CTCAE) and the Functional Assessment of Cancer Therapy/Gynecologic Oncology Group Neurotoxicity (FACT/GOG-Ntx) subscale. Odds ratios and 95% confidence intervals were computed using unconditional logistic regression. Results. Multivitamin use before diagnosis was associated with reduced symptoms of CIPN (CTCAE adjusted OR = 0.60, 95% CI = 0.42-0.87; FACT/GOG-Ntx adjusted OR = 0.78, 95% CI = 0.61-1.00). Although in a similar direction as use prior to diagnosis, multivitamin use during treatment was less strongly associated with CIPN (CTCAE adjusted OR = 0.73, 95% CI = 0.49-1.08; FACT/GOG-Ntx 0.77, 95% CI = 0.60-0.99). Other supplement use, either before diagnosis or during treatment, was not associated with CIPN. Conclusions. Our results indicate that supplement use during treatment may not appreciably affect experience of CIPN symptoms. Future analyses of the relationships between supplement use and survival outcomes will better inform patient decision making. Acknowledgments: supported by R01 CA116395 (CBA); S0221 supported, in part, by National Cancer Institute/Division of Cancer Prevention SWOG NCORP Research Base grant 5UG1CA189974-02; National Cancer Institute (NCI), National Clinical Trials Network (NCTN): CA180888, CA180819; and in part by Amgen, Inc. Citation Format: Gary R. Zirpoli, Susan E. McCann, Lara E. Sucheston-Campbell, Dawn L. Hershman, Greg