By dividing breast cancer into molecular breast cancer subtypes, physicians and researchers can devise better approaches and treatments for dealing with the disease. Most studies divide breast cancer into four major molecular subtypes: Luminal A, Luminal B, Triple-negative, and HER2/neu. Triple-negative breast cancer is characterized by tumors that lack estrogen, progesterone, and human epidermal growth factor receptors.

Higher rates of triple negative breast cancer have been recorded in younger women, Hispanic and African American women, and women of lower socioeconomic
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