Second, the temperature range takes advantage of the natural effect mild hyperthermia has on tumor vasculature. Numerous studies have shown that temperatures between 39-43° C increase blood flow and vascular permeability (or leakiness) of a tumor, which is ideal for drug delivery since the cancer-killing chemicals have easy access to all areas of the tumor. These effects are not seen at temperatures below this threshold, and temperatures above it tend to result in hemorrhage, which may reduce or cease blood flow, hampering drug delivery. It’s the Goldilocks Effect: The in-between range is perfect. The market must be measurable and addressable. There must be some way to say specifically how many patients would benefit from a therapy, and to ensure that those patients have providers caring for them that would make efficient distribution of the therapy possible. For instance, a successful treatment for Parkinson’s disease might be applicable to hundreds of thousands of patients, with little competition from other treatments, whereas a treatment for Von Hippel-Lindau (VHL) might only reach hundreds. If the goal is to recover years of research investment and profit above and beyond that, then market size matters, as do current and future competitors that might limit your reach within a treatment area.