Alex Novakovic has begun the proton therapy which could save his life – after a day out with the Boston Red Sox.
The seven-year-old Bedgrove Infant School pupil, who has a life-threatening brain tumour, met the baseball stars and was paraded on the hallowed turf of Fenway Park to pitch and hit a few balls.
His uncle Daniel O’Brien said: “It was one of the best times of his life. He got to go into the changing rooms, met all the team and watched the games with the WAGs.
“They put him up on the big screen in the stadium and said why he was in Boston. I think he was a bit shocked.”
After the game, Alex even got to sit in some of the players’ supercars and has been invited by pitcher Clay Buchholz to go swimming at his house.
Away from the baseball, Alex has begun the serious stage of his treatment which Aylesbury people helped fund.
On Tuesday he was due to have his first proton therapy session following two weeks of tests.
Alex will now have to spend one hour a day having the therapy for five days a week over the next six weeks.
Mr O’Brien said: “The tests showed there’s been no change in his tumour which is a good thing.
“For the therapy he’ll be put under anaesthetic and then locked into place in the machine.”
Once the therapy is complete Alex will have a week of monitoring and then tests to see the effect of the treatment.
Alex’s mother, Jasmin, who travelled to Boston with him, is also in good spirits and has been regularly checking Facebook messages of support.
Mr O’Brien said: “They give her a real pick-me-up.”
More than £255,000 was raised in a week to send Alex to America.
More than £400,000 has now been raised, with extra cash going towards post-therapy treatment and charity Kids ‘n’ Cancer.