What is small cell lung cancer (SCLC)?

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Small cell lung cancer (SCLC) accounts for about 15-20% of lung cancers diagnosed every year in the United States. It is rarer than non-small cell lung cancer. The term “small cell” refers to the size and shape of the cancer cells as seen under a microscope. Small cell lung cancer appears as small blue cells, instead of the larger cells associated with more common forms of lung cancer. Small cell lung cancer typically starts in the middle part of the chest in a unique set of cells different to non-small cell lung cancer. Small cell lung cancer is treated differently to non-small cell lung cancer.