Therefore, people could try to seek the link between mucin domain TR numbers and the corresponding human traits in large populations, and this will be helpful to study genetic associations with many mucus related diseases such as pancreatic cancer, breast cancer, lung cancer, egg groove cancer, colon cancer, asthma, bronchitis, chronic obstructive pulmonary disease, pulmonary cyst fibrosis, gastric ulcer, edema, etc. The gene discussed is MUC5AC; the disease is breast cancer.