It's good news for brave Megan.
Megan Armstrong, seven, of Appletree Drive, Prudhoe, Northumberland, had the latest scan on her brain last week and the result showed that the tumour has not changed in size.
That means that the vinblastine treatment Megan has been receiving for the last 27 months is still working.
Megan's dad Philip said the result was good news and that Megan's consultant had described it as "quite amazing".
He said: "It was a long wait on Friday because although we had been able to look at the scans, and although it looked the same size to us we had to wait for the expert to say there is no growth.
"We got the phone call that evening and it was a huge relief."
While there is a small chance that vinblastine may kill the tumour on Megan's brain the drug is normally intended simply to block any further growth.
Only one other child in the world has been on the treatment longer than Megan, but had to stop after two-and-a-half years because of the toxicology of the drug.
The toxicology of Megan's blood is being watched closely as her treatment continues.
Mr Armstrong said: "At the moment with her being as well as she is and having the quality of life that she has got it is a question of 'if it's not broken don't fix it'.
"There is a small chance that the drug could kill the cancer. There is not extensive literature on the drug, but there is a chance that she could be very lucky and the vinblastine kills it forever."
But Mr Armstrong added that coming off the drug could also allow the cancer to recover, and that Megan's consultant had agreed that the best course of action was to stay on the drug.
He said that having the tumour under control has allowed the youngster, who "loves" school, to take up horse riding again through the Riding for the Disabled charity. She is also a Brownie and attends her troop each week.
Anyone who would like to make a donation to the appeal set up in Megan's name can call Philip on 07748 911908 or visit the website at www.meganappeal.com
BATTLING ON: Above, Seven-year-old Megan Armstrong, with her sister Kyra at home in Prudhoe. Left, Megan with her mum Sandra, dad Philip and Kyra. Picture: Paul Norris www.icNewcastle.co.uk/buyaphoto ref: 00993848