His father, Roger Guay, told the broadcaster: "He opened up and saw them and it was like getting a gift".
With the news that Jacob won't be leaving the hospital to return home, his family decided to make the most of their remaining time and celebrate.
CNN reports that Jacob's favourite things include Minecraft, Legos and Star Wars.
"The overflowing has made my heart full and exceptionally cheerful", said Tara Artinyan, Jacob's stepmother.
Jacob Thompson and his family will celebrate Christmas early this year after receiving the news that his neuroblastoma was incurable.
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But Jacob has Stage 4 high-risk neuroblastoma, and doctors told his family in early October he probably only had a month to live. "He was excited to see what people had to say and it just brightened his day".
Jacob was diagnosed at age 5 with neuroblastoma, a malignant cancer of the nerve cells that is nearly exclusively found in children and extremely hard to treat. He's also a typical 9-year-old boy.
On Nov. 1, Thompson's mother, Michelle Thompson Simard, shared on Facebook that the first card had arrived from a friend named Nolan.
Simard anticipates more cards will be sent from people living in Europe, Australia and Anartica, she said.
"We've got over a hundred, and they're from all over the world".
Now, as he lives out what could be his final weeks in Barbara Bush Children's Hospital in Portland, Maine, people who will never meet Jacob but who have been moved by his story are making sure he has the Christmas of a lifetime. "We've even heard from Antarctica". His room will be decorated with a tree, snow, lights, and Santa Claus will even pay him a visit. Penguins are his favorite animal and his mom said that "live like a penguin" is one of his mottos.