A selfless Wellington teenager with inoperable brain cancer has raised more than $200,000 for cancer research in just four days.

15-year-old Jemima Gazley was diagnosed with stage 4 brain cancer in February this year.

"It was so hard to hear, it was the biggest news of my life. But I'm so glad to still be here today," she said.

Jemima's Dad Oliver Gazley said the page was a reflection of her kind nature and selfless character.

Oliver joined Nick Mills on Wellington Mornings.

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