Last February, doctors found a tumor behind Peabody-native Chris Sakelakos’ knee. In May, he was diagnosed with osteosarcoma, an aggressive type of bone cancer, and received a 12-hour surgery to completely replace his knee. Almost a year after that surgery and after rehab, treatment, and the cancer spreading to his lungs, Chris Sakelakos’ brother, Mark Sakelakos, and his … [Read more...] about Thousands raised for local teacher’s battle with cancer