Dallas Cowboys owner Jerry Jones revealed he suffered from stage 4 melanoma for over a decade but survived, according to the Dallas Morning News.

Jones said his life was saved by an experimental drug treatment called PD-1 therapy, which, according to the American Cancer Society , keeps T cells from attacking normal cells.

“PD-1 is a checkpoint protein on immune cells called T cells . It acts as a ‘off switch’ to helps keep the T cells from attacking normal cells. PD-1 does this by attaching to PD-L1, a protein found on some normal and cancer cells. When PD-1 binds to PD-L1, it tells the T cell not to attack. Some cancer cells have large amounts of PD-L1, which helps them avoid being attacked by the immune system.”

Jones received treatment from the MD Anderson Cancer Center in Hous

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