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Ovarian cancer cell. Coloured scanning electron micrograph (SEM) of an ovarian cancer cell. Cancer cells are typically large, have an irregular surface and divide rapidly in a chaotic manner. Clumps (tumours) of these cells may form and can invade and destroy surrounding tissues. Healthy ovaries produce female reproductive cells. Ovarian cancer does not normally produce symptoms until it has reached an advanced stage. The prognosis is poor unless it is detected early. Treatment will involve the surgical removal of tumours, followed by chemotherapy. Magnification unknown. (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER)