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Lung cancer is the leading cause of cancer deaths worldwide. A large part of this high mortality rate is due to the onset of metastatic disease prior to diagnosis. Advances in treatment for metastatic disease may be achieved by understanding more about the identity of metastatic tumor cells and the mechanisms those cells employ to spread throughout the body. This thesis examined the relationship between cells capable of tumor propagation upon serial transplantation (tumor-propagating cells, or TPCs) and those with metastatic potential.