E. GRAY / SCIENCE PHOTO LIBRARY E. GRAY / SCIENCE PHOTO LIBRARY
Lung cancer. Scanning electron micrograph of cancer cells proliferating inside alveoli (air sacs) in a human lung. The alveolus in the lower right is almost completely blocked. These cells are part of an adenocarcinoma, a malignant tumour derived from glandular epithelial tissue. Lung cancer is one of the most common and dangerous forms of cancer. Fewer than 10% of patients survive for five years after diagnosis. The cause of the disease is not always clear; although cigarette smoking is known to cause other forms of lung cancer, such as squamous cell carcinoma, the link between tobacco and adenocarcinoma remains unproven. Magnification x1750 at 10x8 inch size.
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