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Small cell cancer of the lung is the leading cause of death. It is an undifferentiated tumour, which usually involves the right upper lobe of the lung parenchyma. It can easily spread through blood to distant organs. At the time of diagnosis the tumour is well spread to other tissues, as the tumour is highly invasive. The tumour is associated with the production of hormones adrenocorticotropins or ACTH. Smoking is the risk factor for the formation of the tumour. The tumour is sensitive to chemotherapy and radiation therapy. Surgery is usually not a treatment option even when the tumour is small. With treatment the survival can be upto one year.
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