Last October, The Advocate reported on Alex�s plight to find a suitable bone-marrow donor, which is akin to winning a lottery.
However, a donor was eventually located and the transplant procedure went ahead last month.
The next few months will involve home isolation, constant monitoring and visits to the hospital twice per week.
If all goes smoothly, Alex could be playing in a park for the first time in six months and the Watson family can take their first holiday together next summer.
Alex�s father Rob said his son�s improved health would open up a completely new world.
�Alex doesn�t know any different to the constant hospital visits, medication and controlled environments,� he said.
�He can�t play at the park or go to pre-kindy.
�But we�re confident he can beat this now and, in six months, we can plan for our future and become a normal family again.�