With two world class cancer treatment / research centers already in Jax (Mayo Clinic & UF Proton Therapy Institute) it's interesting that another is choosing Jacksonville, especially since UF Health, as a university system, is so entrenched in the area already.
Simply put, it is because there is high demand. Proton Therapy has proven to be highly successful to a multitude of cancer types; both in terms of remission rates and in the effects on the patient. After spending the past year going through chemotherapy and radiation treatments for pancreatic cancer, the doctors have done what they can and it stopped growth, but still need to reduce the mass size before I can consider surgery. Proton therapy is the only way to do this (10 years ago, I would've been classified as terminal); these are my anticipated wait times for the waiting lists I am currently on, keep in mind I applied to these centers in May, 2014:
Sloan-Kettering (my primary care provider): Summer/Fall 2015
UF Jacksonville: 20-24 Months (as of Sept. 1, 2014)
Penn Medicine-Roberts: Target April, 2015
MD Anderson Orlando: January-March, 2015
The reason for these times is simply due to demand, they can only treat so many people at a time, and the machines necessary are high cost so there aren't many in the nation when you consider all the types of cancer it can treat.
This is a huge benefit to Jacksonville, just look at 3rd & Main in Springfield to see the benefits that something like this can have on the community.