Former NBA player Jason Collins has revealed he is battling stage 4 brain cancer.

In an essay for ESPN, the 47-year-old said he has been diagnosed with stage 4 glioblastoma, one of the most aggressive forms of brain cancer.

Collins said he began experiencing symptoms over the summer and later learned he has a tumor that cannot be safely removed. He has decided to undergo a combination of radiation, targeted chemotherapy and immunotherapy.

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Still, the average prognosis for glioblastoma is 11 to 14 months.

"If that's all the time I have left, I'd rather spend it trying a course of treatment that might one day be a new standard of care for everyone," Collins wrote.

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