LYZ and breast cancer: At present, multidisciplinary research evidence has confirmed that BC is rich in nutrients and a large number of immune factors and growth factors, such as immunoglobulins, lactoferrin, lysozyme, insulin-like growth factors, epidermal growth factors, etc., having very clear health benefits for immune regulation, gastrointestinal tract improvement, growth and development, ageing, antibacterial, and anti-inflammatory functions [4].