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Cancer cells appear through a series of genetic and epigenetic changes. Some of these changes may be either inherited or more often, caused by carcinogens (cancer-causing substances) in our environment. 2 In general, solid tumors, contain multiple mutations.
Cancer cells look different. Under a microscope, cancer cells may look very different from normal cells. They often have different sizes and some may be larger than normal while others are smaller. Cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.