• Danny Bullen had the treatment last month and should have a second this year 
• The next day his mother claims he asked for ‘more potatoes [crisps] please’
• The youngster needs help going to the toilet and attends a specialist school

The parents of an autistic schoolboy claim he spoke his first full sentence just hours after undergoing stem-cell therapy in the US.

Danny Bullen, who lives in Tenerife with his parents and is non-verbal, traveled to Miami last month for the experimental treatment.

The following day, the 11-year-old’s mother Irma Guanche, 45, claims Danny asked her ‘dame mas papas, por favor’, which translates as ‘give me more potatoes [crisps], please’.

Danny has allegedly not spoken another full sentence since but his parents claim they have been told it may take several months before they notice big changes. 

The parents were able to pay for their son’s treatment after a fundraising page raised £8,600 in two months. 

And they are appealing again to cover Danny’s second bout of therapy later this year.

The parents came across the treatment online via parent support groups and forums.

Advocates claim it causes ‘all autism symptoms to completely disappear’. 

Early studies have shown promise for stem-cell therapy as a potential treatment for autism.

However, scientists stress it is still in its infancy and more research is needed. 

Danny’s father Lee Bullen – who is a writer and penned a book about his son’s condition called Beset – said: ‘Doctors introduced umbilical cord blood stem cells with cells from my son’s bone marrow and adipose tissue.

‘He had his first treatment in March and the early signs are very encouraging. 

‘He is more alert and has already started to use a few new basic words and greetings.

‘Undergoing stem cell therapy over two or three visits usually brings better results, which is why we hope to take Danny to the US at least twice.

‘All symptoms related to ASD (autism spectrum disorder) have completely disappeared in many young patients.’ 

One parent of an autistic child, who preferred to remain nameless, claimed her daughter only experienced ‘modest results’ after undergoing stem-cell therapy two years ago.

Danny was diagnosed with autism in 2010 at just two years old after his development and communication stopped almost overnight.

As well as being unable to speak, Danny cannot use the toilet without help and is forced to attend a specialist school in his hometown of Candelaria.     

As well as the fundraising page, Danny’s family in Australia held a ticketed event that raised £2,150 ($2,810), while the children’s charity Helping Hands in Tenerife donated £860 ($1,124).

The Ave Fenix Masonic Lodge in Los Cristianos gave the parents a cheque for £860 and the Blevins Franks Charitable Foundation donated £560 ($732). 

All this enabled Danny to travel to the Art and Science Surgicenter clinic in Miami for treatment costing £11,425 ($14,935).

The youngster’s parents hope to take him again this year for a £7,615 ($9,954) procedure. 

To help with the costs, they have a crowdfunding campaign on GoFundMe where they hope to raise around £26,500 ($34,646) for two sessions, as well as to cover some of the travel and accommodation costs.