The diagnosis was dire: Roland Williams, a St. Louis boy with a megawatt smile and a penchant for painting, had an extremely rare form of lung cancer, oncologists told his mother in May 2016.  “They didn’t think he would make it to see his 10th birthday,” Myra Gregory said. “But thankfully the insurance was covering everything at that time, so we were happy to make it to see number 10 and 11.”