After kicking cancer, this former Marine celebrated by racing over 10,000 miles across Europe and Asia

The INSIDER Summary:

• Adam Casey was in the Marine Corps when he found out he had stage IV cancer.
• He celebrated entering remission by racing in the Mongol Rally and Derby.

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It's difficult to tell where Adam Casey's story begins.

Perhaps it's when he met a girl who changed his life and inspired him to start a nonprofit called I Do It For Her, helping at-risk youth in St. Louis receive a better education.

Or when he enlisted in the military and became a First Lieutenant Infantry Officer in the Marine Corps.

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Perhaps it's when he was diagnosed with stage IV cancer.

Maybe it's when he entered remission, and celebrated by racing 10,000 miles in the Mongol Rally and got halfway through the Mongol Derby before the wild horse he was riding bucked him off and broke his ribs.Perhaps Casey's story hasn't even begun yet. But it certainly isn't over.