Glutamine for the Prevention of Radiation Toxicity in Subjects Conserving Therapy

Inclusion Criteria: * Subject have been diagnosed with Stage I or II invasive breast cancer * Subject will undergo Accelerated Partial Breast Irradiation (APBI) as part of Breast Conserving Therapy (BCT) * Subject is eligible for APBI based on American Society of Therapeutic Radiation Oncology (ASTRO) criteria * Subject is 18 years of age or older * Subject is female Exclusion Criteria: * History of uncontrolled, clinically significant lung, heart, endocrine, liver, or renal disease * Subject has been diagnosed with any other cancer * Subject has a known hypersensitivity reaction to the following: oral glutamine (GLN), glutamate, monosodium glutamate (MSG) (i.e., Chinese restaurant syndrome) * Subject has history of collagen vascular disease * Subject has been diagnosed with Diabetes mellitus I or II * Subject has had any prior breast radiation * Subject is pregnant or breastfeeding