Stage 0 (Carcinoma in situ)

Stage 0, or carcinoma in situ, refers to a very early stage of cancer where abnormal cells are found in the lining of a particular organ but have not spread to nearby tissues. This means the cancer is localized and has not invaded surrounding areas. It is often highly treatable and may be detected through screenings. While these cells have the potential to become invasive cancer in the future, at this stage, they are confined to their original site, making early intervention crucial for a favorable outcome.