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When I was undergoing radiation therapy for my spinal tumor, I took my 12-year-old brother to the MD Anderson Proton Therapy Center. He wanted to see the machine and was fascinated by the process.

On the drive home, he asked me, ¡°Bubba, what¡¯s the scariest thing you¡¯ve ever done?¡±

I had to be honest with him: I told him it was the surgery I¡¯d just gone through and proton therapy. It was really fear of the unknown. With cancer...