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He was given just days to live, had four bone marrow transplants and had to be isolated in a room with no windows for five months to help battle his cancer.

Now this incredible teenager has the world at his feet once again - after recovering from not one but TWO types of cancer.

Deryn Blackwell, 15, has stunned his family, doctors and experts by fighting back from the brink after being so sick medics warned his family to prepare for the worst.

Now the hero teenager has beaten massive odds by conquering both killer diseases and returning to the classroom with his old mates.

His ecstatic mum, Callie Blackwell, 35, admitted that she wept tears of joy and sheer emotion as she bought her son's new uniform on an amazingly moving day for them all.

(Image: Archant)

"Buying his uniform with Deryn was so hard for me," said Mrs Blackwell, of Watton, Norfolk.

"I was picking out his trousers and I suddenly got a huge lump in my throat.

"Deryn asked me 'why are you crying?' and I said 'I didn't expect you to finish an advent calendar let alone go back to school'."

Callie made headlines all over the globe when she said memorably in February 2013 as brave Deryn was at the brink of death.

She said: "My son is fighting TWO cancers - leukaemia and Langerhans Cell Sarcoma.

"He is truly just one in seven billion all over the world."

Read more: Cancer survivor on his first day at school with his twin

She never thought or dared to hope that she would see the day when Deryn pulled on his blazer and knotted his tie as he returned to his old school.

The incredible youngster is now back in the thick of it at Wayland Academy in Watton to take his GCSEs with his delighted pals.

Deryn completed year seven before being forced to leave as he suffered a huge double hammer blow.

He was hit by leukaemia when he was just 10 - and Langerhans cell sarcoma, an extremely rare and aggressive cancer, two years later.

Deryn was transferred to a specialist unit at Bristol Royal Hospital in February 2013 as he faced a mountain to climb.

His astonishing story appeared all over the country as celebrities such as Bake Off star Paul Hollywood, comic Russell Howard and actor Simon Pegg went to see and support him and became his friend.

Read more: Brave cancer patient takes hilarious selfie

Deryn had four unsuccessful bone marrow transplants as he appeared to be losing his rollercoaster life-and-death battle.

The outlook was so bad that he was moved with his devastated family to the Children's Hospice South West at Wraxall, Somerset, in December 2013 as all seemed lost.

Deryn was given just days to live as mum Callie, dad Simon, 36, and his younger brother Dylan, now 11, feared the worst.

But somehow the little hero battled his way back from the abyss as his body started producing white blood cells to combat the bad cancerous cells in nothing short of a miracle.

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And now superboy Deryn's just excited to be back at school with his old chums.

He said: "It's a lot of fun to be back, it has definitely changed a lot.

"Some people haven't even realised I'm back because I look normal.

"People are only just starting to catch on that I am back.

"It was mum's idea, initially I didn't want to come back because I had been away for so long.

"But I'm very happy to be back now and I'm really settling in.

"I spent about 18 months in a room on my own and five months in a room which had no windows so this is very different."

After remarkably going into remission Deryn's now looking forward to going to his prom as he works on passing his GCSEs and going on to study biochemistry.

Mum Callie said she'd decided to take him back to school just a few weeks ago. "He was going to go to the prom and things like that and I thought why doesn't he just go back for the year.

"His immune system is even better than mine now he's done that well," said the devoted mother-of-two.

"Deryn still struggles with mobility a bit and he gets very tired.

"But the main reason for going back was so he can develop emotionally and socially in that way teenagers, particularly boys, need to at that age.

"He has spent two years in a room by himself with just a nurse or me around, so it is good for him to just be normal for a while."

Even after defeating cancer Deryn has had to confront other serious threats such as aplastic anaemia.

The condition occurs when the body stops producing enough new blood cells and leaves victims exhausted and with a higher risk of infections and uncontrolled bleeding.

But Deryn's now firmly back on the track to total recovery and academy principal Glen Allott said it was a pleasure to get him back.

Mr Allott said: "It is our privilege really to have Deryn here with us.

"To have started his journey with us and with all he has gone through it is nice for him to finish it with us. "It is going to be amazing to see him at the prom."

The big-hearted Blackwells have now set up the charity DoEveRYthiNg to help other children and teens tackling cancer.