Breast cancer cell. Coloured scanning electron micrograph (SEM) of a breast cancer cell. The cell shows numerous processes and microplicae (fine surface folds). These features are characteristic of highly mobile cells, and enable cancerous cells to spread (metastasis) rapidly round the body, and invade other organs and tissues. Cancer cells divide rapidly and chaotically, and may clump to form malignant tumours. The tumours often invade and destroy surrounding tissues. Breast cancer is the most common form of cancer in women. Treatment involves surgical removal of the tumour, often combined with radiotherapy and chemotherapy. Magnification: x3500 when printed 10cm wide.