Reduction of Serum Concentrations and Synergy between Retinol, β-Carotene, and Zinc According to Cancer Staging and Different Treatment Modalities Prior to Radiation Therapy in Women with Breast Cancer.

Unlabelled: The procedures used for breast cancer treatment are able to increase the level of oxidative stress and cause depletion of antioxidants.

Objectives: To investigate the relationship between serum concentrations of retinol, β-carotene, and zinc, according to breast cancer staging, considering different treatment modalities prior to radiation therapy and the synergistic action between these micronutrients.

Methods: This is a cross-sectional observational study comprising a cohort of patients with breast cancer which was carried out prior to radiation therapy.