Carcinoma in Situ (CIS)

Definition

Cancer that hasn't invaded beyond the epithelial layer yet—basically, pre-invasive cancer. Early catch, high cure rates. It's cancer's warning level before things get serious.

Example Usage

The cervical biopsy showed cervical intraepithelial neoplasia grade 3, considered carcinoma in situ.

Origin

From Latin 'carcinoma' (cancer) and 'in situ' (in place)

Fun Fact

CIS treatments often involve much less aggressive surgery than invasive cancer, with 5-year survival rates exceeding 90%.

Source: Oncology; Pathology standards

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