Carcinoma in situ (CIS) refers to a group of abnormal cells that remain localized and have not invaded surrounding tissues. It is often considered an early form of cancer, where the cells exhibit cancer-like characteristics but are confined to the layer of tissue where they originated. CIS is typically asymptomatic and may not spread unless treated. Examples include cervical carcinoma in situ and ductal carcinoma in situ (DCIS) of the breast. Early detection and treatment are important to prevent progression to invasive cancer.
Define briefly carcinoma instu?!
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