____________ cancer accounts for more deaths than any other form of cancer. Of the three forms of lung cancer, the most common i
s ____________ carcinoma. In this type, ____________ develop bleeding lesions as the dividing epithelial invade the bronchiole wall. A second form, adenocarcinoma, originates in the ____________ glands of the lamina propria. The least common but most dangerous is small-cell carcinoma, which easily and quickly ____________ to other organs.
