British brain tumour patient Ashya King is set to go to the Czech Republic for the treatment his parents wanted him to receive.
The five-year-old's medical records have been sent to the Proton Therapy Centre in Prague, which said it had agreed the specialised technique is suitable for him.
The development came as Ashya's parents Brett and Naghmeh prepared to be reunited with their son.
They were freed from Soto del Real prison near Madrid after British authorities dropped the case against them amid a storm of criticism.
As they prepared to see their son for the first time since they were detained on Saturday, Brett King, the five-year-old's father, said his heart was "aching" while his wife Naghmeh said she had been "crying and crying" in a prison cell.
King told the BBC: "My heart is aching for my son. I want to see my son's face."
Asked what the ordeal had been like, Naghmeh King said: "All I was doing all the time was crying and crying. What could I do in a prison cell?"
The couple were freed on Tuesday night after British authorities abandoned their attempts to extradite them amid a public backlash.
Asked how angry they were, King said: "I wouldn't say angry, I'm just missing my son so much. Anger can't come in at the moment because I've just got these feelings I've got to see my son's face."
The boy's mother said: "I just want to wet his mouth because he can't drink through his mouth, I want to brush his teeth, I want to turn him side to side every 15 minutes because he can't move. I just want to do all those things I was doing from Southampton, I want to do it for him here."
Asked about being separated from her son, she said: "I was just praying so I could be reunited with him again. I couldn't do much, really - all I could do was just cry and pray."
A spokesman for the Proton Therapy Centre (PTC) disclosed that it had received additional information concerning the status of Ashya's health.
He said Dr Gary Nicolin, a consultant paediatric oncologist and lead for paediatric neuro-oncology at the Department of Paediatric Oncology at University Hospital Southampton, had sent complete medical reports, including operation notes, histology reports and imaging reports.
He said the PTC medical board reviewed this documentation at 8am local time on Wednesday.
Dr Jiri Kubes, head of proton therapy at Proton Therapy Center Czech, said: "We have agreed that proton therapy is a suitable method of treatment for Ashya.
"So, Ashya shall go for proton therapy to the Czech Republic. However, prior to this he will need to return to England first."
The centre said Dr Nicolin had confirmed that Ashya must first undergo two cycles of chemotherapy, which are expected to take several weeks.
After that he would be able to travel to Prague for proton therapy, the spokesman said.
A fundraising page set up to help pay for the treatment has so far raised more than STG21,000 ($A38,331.66).
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