(CNN) - The first openly gay athlete in the NBA has revealed a major health diagnosis.
Jason Collins shared with the world he has stage 4 brain cancer.
The former NBA center, who played for teams like the Nets and Hawks, announced in September that he was undergoing treatment for a brain tumor.
FILE - Brooklyn Nets center Jason Collins looks on against the Denver Nuggets in the third quarter an NBA basketball game in Denver on Thursday, Feb. 27, 2014.(AP Photo/David Zalubowski)
He shared an emotional essay with ESPN on Thursday.
Collins [said](https://www.espn.com/nba/story/_/id/47266076/jason-collins-stage-4-glioblastoma) his brain tumor grows very aggressively, but he did not give a prognosis.
Despite the news, the 46-year-old said he is thankful for the support of his family and he is going to continue fighting.
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