👉 Perithelial refers to a cell that is not directly attached to another cell or tissue but rather acts as an extension of it. This concept is often used in the context of cancer, where cells that are not normally associated with the primary tumor are considered "perithelial" and may undergo changes that can lead to cancer progression. In this way, perithelial cells are like a protective barrier between the cancerous tissue and its surrounding healthy tissues, allowing for cell proliferation and growth in response to