The addition of intravenous (given through a vein) cisplatin to immunotherapy improves treatment outcomes for lung cancer, but unfortunately results in significantly more side effects since the rest of the body is exposed to significant amounts of the drug. Our clinical trial data indicate that injecting cisplatin directly into the tumor using a bronchoscope (a small flexible tube with a camera in it) has very few side effects, and results in significant cell death and potentially improvement in the immune response. The goal of this proposal is to evaluate a computational approach, that incorporates data from a CT scan, to determine the optimal dose and delivery location within a tumor to maximize tumor cell killing and the immune response.