Breast cancer in adolescents and young adults: a review with a focus on biology.

@article{Tichy2013BreastCI,
  title={Breast cancer in adolescents and young adults: a review with a focus on biology.},
  author={J. R. Tichy and Elgene Lim and Carey K Anders},
  journal={Journal of the National Comprehensive Cancer Network : JNCCN},
  year={2013},
  volume={11 9},
  pages={
          1060-9
        }
}
Breast cancer is a substantial contributor to adolescent and young adult (AYA) malignancies, defined as a diagnosis of cancer between the ages of 15 and 39. In the United States, 6.6% of breast cancer cases are diagnosed among women younger than 40 years. When breast cancer occurs in AYAs, it typically has a worse prognosis and more-aggressive phenotype; higher proportions of high-grade and later-stage tumors; lower estrogen receptor positivity; and, in some studies, higher expression of HER2… 
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TLDR
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