“ Ewing ’s is an uncommon form of cancer, but when it develops, it’s usually in an arm or a leg. In this case, the uncommon cancer had chosen an uncommon spot, the underside of Matt’s right sixth rib. Even so, Ewing ’s had been known to respond to chemotherapy. His chances of surviving were judged to be eighty percent.

“In January, he rapidly learned to familiarize himself with the names of arcane-sounding drugs. Vincristine. Methotrexate. Adriamycin.

“Cytoxan. The last part of that chemical’s name-not its spelling but the way it’s pronounced-says everything. Toxin. These substances were poisons intended to kill the tumor, but unavoidably they hurt healthy tissue as well.

“By early February, Matt’s long curly hair, grown in imitation of his rock music heroes, had begun to fall out in huge disturbing clumps that littered his bed and clogged the drain when he took his morning shower. It’s a measure of Matt’s spirit that he decided to cut this ugly process short by having a party in which his friends ceremonially shaved him bald. Some of them still have his locks. His eyebrows and eyelashes were less easy to deal with. He let them fall out on their own. He never tried to disguise his hairless condition. No wig for him. He displayed his baldness boldly for all the world to see and sometimes stare at and on occasion ridicule.

“It’s a further measure of Matt’s spirit that the weakness, disorientation, and vomiting produced by his medications never slackened his determination to persist at school. A straight A student soon was making grades that a few months before would have embarrassed him.

“But he hung in there.

“Chemotherapy was infused through an intravenous line, a tube surgically implanted beneath the skin of his left chest.