There’s plenty of time for patients to mingle in the waiting room of the $125 million Proton Therapy Center in Houston. In one corner, Alexander Glaros, a 16-year-old with Ewing’s sarcoma, plays cards with his mom. In another, a prostate cancer patient in his 60s entertains a toddler who is awaiting treatment for the tumor in her brain. Nearby, a middle-aged woman with lung cancer pages through a newspaper. While they have different types of cancer, all are counting on the same technology, a high-tech radiation treatment called proton beam therapy.