View a transcript for the video about what is cancer and how does it start. It can take many years for a damaged cell to divide and grow and form a tumour big enough to cause symptoms or …

As cancer cells divide, a tumour will develop and grow. Cancer cells have the same needs as normal cells. They need a blood supply to bring oxygen and nutrients to grow and survive. …

Nov 18, 2025 · How Do Cancer Cells Form? Cancer cells start to form when genes, made up of DNA, experience certain changes (mutations) that cause the cells to behave abnormally. …

Apr 19, 2025 · What begins as a microscopic change deep within the DNA of a single cell can ignite a chain reaction, leading to tumors, spreading through tissues, and sometimes claiming …

Oct 11, 2021 · When cells grow old or become damaged, they die, and new cells take their place. Sometimes this orderly process breaks down, and abnormal or damaged cells grow and …

Carcinogenesis, also called oncogenesis or tumorigenesis, is the formation of a cancer, whereby normal cells are transformed into cancer cells. The process is characterized by changes at the …

The change in the cell’s genetic material may occur spontaneously as a random event or be brought on by an external exposure to a substance that causes cancer (a carcinogen).

Nov 19, 2024 · 3D maps of cancer produced by an NIH initiative provide critical information on how tumors develop, spread, and respond to treatments.

Cancer develops through a multi-step process where cells accumulate genetic mutations and epigenetic alterations that enable them to bypass normal growth controls, avoid cell death, …

Cancer is not one disease, but a collection of related diseases that can affect nearly any part of the body. Throughout the course of cancer development, abnormal or damaged cells acquire …