The average size of breast cancer tumors among young
women is larger, and the progression of breast cancer is more
advanced, with more cases displaying lymph node invasion
(Anders et al., 2009). Considering that breast cancer tumor
size and disease metastasis are important factors for breast
cancer survival, the onset of breast cancer among young
women heralds a poorer prognosis compared to middle-aged
women (Yankaskas, 2005–2006).