Published Tuesday, 10 September 2013
Thousands have supported Oscar’s fundraising since he was diagnosed with cancer. (© Presseye)
The now five-year-old has captured the hearts of thousands of people through his emotional journey after he was diagnosed with neuroblastoma, a rare and aggressive form of cancer.
In April, his family were told that he had beaten the disease after an 18-month long battle.
However, doctors said there was a 50% chance of a relapse and in August, the family received the heartbreaking news that their son's illness had returned.
Things are very tough and Oscar is suffering quite a lot right now - however, in true #TeamOscar style, we are doing our best to gather all our strength to follow our little boy's lead.
Leona and Stephen Knox, in their blog
Over the weekend, Oscar returned home after undergoing intense chemotherapy - however, the family has admitted that they do not "even know if the treatment is working yet".
They are celebrating the little lad's special day though and have been receiving lots of birthday messages - including from deputy First Minister Martin McGuinness in New York, who tweeted a rendition of 'Happy Birthday' from New York despite the time difference.
Boxers Paddy Barnes and Carl Frampton also added their best wishes.
"Happy birthday, hope you have a good one, mate," Frampton tweeted, complete with #Fearless.
Despite the boost of spending Oscar's birthday at home, his parents Leona and Stephen have said they were "devastated" that their son could not begin school this year.
Writing in their blog, the family said: "Oscar is enduring TVD chemo as the first line of attack on his relapsed neuroblastoma.
"This is an extremely tough combination of three different chemo drugs, and so Oscar is suffering extremely tough side effects.
"Most of our time will be spent in hospital. We don't even know if the treatment is working yet, we are searching for positive signs every day."
They added: "He is still suffering symptoms of his disease such as extreme pain, and his morphine requirements are increasing every few days.
"His hair has already started to fall out, which is upsetting him. We had it cut short last week to try to make this phase less traumatic."
But Stephen and Leona also thanked everyone for their "lovely messages" of support over the difficult period and said that, while they could not always reply, "none go unnoticed".
© UTV News