Former NBA center Jason Collins , who was the first active, openly gay professional in the American 'Big 4' sports, revealed that he's currently undergoing treatment for Stage 4 glioblastoma in an exclusive piece he published with ESPN 's Ramona Shelburne on Thursday (December 11).

"A few months ago, my family released a short statement saying I had a brain tumor. It was simple, but intentionally vague," Collins wrote. "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. I have Stage 4 glioblastoma, one of the deadliest forms of brain cancer. It came on incredibly fast."

Collins, 47, played for six NBA teams --

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