By comparing A) a patient's TTP on targeted therapy vs. B) their TTP on their most recent prior therapy, investigators will minimize the variability in TTP observed across cancer subtypes, and be able to enroll patients with any type of solid tumor in a statistically unbiased manner. Based on the literature, investigators expect at least 35% of patients treated with a genetically-informed targeted therapy to exhibit a longer progression-free interval than would be expected with standard therapies. This "TTP ratio" for each patient is calculated using the formula: