Carcinomas in situ are malignant cells that remain within the original site with no spread to or invasion of neighboring tissues.

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Carcinomas in situ are considered to be the earliest stage of cancer development, where cells have acquired some malignant characteristics but are still localized to their original site without invading the surrounding tissues. They are not considered invasive cancer and have the potential to be completely cured if detected and treated early.

Carcinomas in Situ Are Malignant Cells That Remain Within the Original