WASHINGTON — Jason Collins, the NBA’s first openly gay player who now serves as an ambassador for the league, is undergoing treatment for Stage 4 glioblastoma .

Collins shared the update in an interview published Thursday with ESPN's Ramona Shelburne .

Back in September, his family revealed in a statement to the NBA that he was undergoing treatment for a brain tumor.

Collins explained in the ESPN interview that the statement was "intentionally vague."

"They did that to protect my privacy while I was mentally unable to speak for myself and my loved ones were trying to understand what we were dealing with. But now it's time for people to hear directly from me," Collins said in the online article .

Collins recounted that doctors discovered a baseball-sized mass in his brain in

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