doctors who treated brain cancer sufferer ashya king in britain yesterday accused the boy 's parents of putting his life at risk when they refused to let him have chemotherapy .
consultant peter wilson told a bbc tv ashya 's chances of long-term survival could have been halved by brett and naghmeh king 's decision to flee abroad with him before he had the treatment he was being offered .
dr wilson , clinical director for child health at southampton general hospital , claimed the chemotherapy was essential to reduce the chances of the five-year-old 's cancer returning .