Preinvasive cancer is a term used to describe a situation where abnormal cells are growing inside the body but have not invaded the surrounding tissue yet. Synonyms for preinvasive cancer include carcinoma in situ, noninvasive cancer, and stage 0 cancer. These terms are often used to describe the early stages of cancer development, which can be detected through regular screening and diagnosis. Preinvasive cancer is usually treated with surgery or other methods to remove the abnormal cells before they can become invasive and potentially spread to other parts of the body. It is important to monitor any signs of preinvasive cancer to prevent further complications and promote better health outcomes.