CECIL H. FOX / SCIENCE PHOTO LIBRARY CECIL H. FOX / SCIENCE PHOTO LIBRARY
Breast cancer cells. Light micrograph of cancer cells removed from a woman's breast by fine-needle aspiration biopsy. Seen here, typical of cancer cells, are large nuclei (coloured magenta), with much variation in cell size. Cell growth is chaotic. A cancerous (malignant) tumour arises by transformation of normal cells into cells that escape the usual moderating controls of growth and differentiation. Instead, cancer cells become large, divide rapidly, and display chromosomal abnormality. Breast cancer is usually a carcinoma arising from the epithelium of mammary lobes or ducts, and these cells may invade surrounding tissues. Magnification: x250 at 35mm size.
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