 Small cell lung cancer accounts for approximately 15 of all lung cancer diagnoses in the United States US, with 60-80 response rates to platinum-based chemotherapy in extensive disease. Despite its sensitivity to chemotherapy, small cell lung cancer is characterized by its tendency to spread to other locations in the body such as the bloodstream and other organs such as the liver. Currently, the only FDA-approved second-line therapies are oral and parenteral topotecan, although irinotecan is also commonly used in primary and relapsed disease. Novel combination therapies are desperately needed in this disease. in order to improve survival. 