Carcinoma in situ

Carcinoma in situ generally refers to those with atypical hyperplasia (severe) in the epithelial layer of the mucosa or in the epidermal layer of the skin that affects the entire epithelium, but have not penetrated the basement membrane and infiltrated the growth. Examples include carcinoma in situ of the cervix, esophagus, and skin. In addition, when the breast lobular acinar has become cancerous and has not infiltrated outside the lobule, it can also be called lobular carcinoma in situ. Carcinoma in situ is an early cancer, so early detection and active treatment can prevent it from developing into invasive cancer, thereby improving the cure rate of cancer. Common carcinomas in situ include skin carcinoma in situ, cervical carcinoma in situ, gastric carcinoma in situ, rectal carcinoma in situ, intraductal carcinoma of the breast, and carcinoma in situ of the breast.