The British cyclist's new memoir about his life comes out on Nov. 7 and shares new details about his diagnosis.

Sir Chris Hoy, an Olympic gold medal cyclist, has terminal cancer.

The 48-year-old shared his diagnosis in an Oct. 19 interview with The Sunday Times, revealing that he likely has two to four years to live.

In February 2024, Hoy announced that he'd been diagnosed with cancer in 2023 and was undergoing treatment, including chemotherapy. At the time, he described his outlook as "optimistic" and "positive."

While speaking with The Sunday Times, the British cyclist revealed that he's known his cancer was terminal for a year but chose to keep it private.

In September 2023, Hoy went for a scan after feeling strain in his shoulder. Doctors promptly found tumors in his shoulder, pelvis, hip, spine and rib. As it turns out, the athlete's primary cancer was in his prostate but had metastasised to his bones.

Hoy soon learned that he had Stage 4 incurable cancer.

After Hoy and his wife told their two children (then 9 and 6) about the diagnosis, the athlete started treatment and had a rough go with chemotherapy, including an allergic reaction that left him "absolutely broken by the end of it."

Though he tried to keep his diagnosis private, Hoy said it was "frustrating" when the news somehow leaked to a journalist, who approached him for an interview.

"It would have happened at some point," he said. "And there was a relief with it. It was awful, because that Pandora's box is opened and you can't shut it. But it was like a pressure release."

Hoy has been working on a memoir about his story and he told The Sunday Times he holds nothing back in the book.

"I think it's important to show how bad it was," he said.

In the book, Hoy also reveals that his wife was diagnosed with multiple sclerosis around the time that he was diagnosed with terminal cancer.

"It didn't seem real. It was such a huge blow, when you're already reeling. You think nothing could possibly get worse. You literally feel like you're at rock bottom, and you find out, oh no, you've got further to fall. It was brutal," he said.

Still, the couple tries to keep things in perspective, despite the tough blows life has recently dealt them.

"She says all the time, 'How lucky are we? We both have incurable illnesses for which there is some treatment. Not every disease has that. It could be a lot worse,'" he said.

With his memoir, Hoy hopes to change "the perception of Stage 4."

"There's so much positivity that can come out of this from all angles. I'm just really excited that this book hopefully will be able to help people," he said.

Over the last year, Hoy has gained valuable perspective on the fragility of life amidst his diagnosis.

"I've learned to live in the moment, and I have days of genuine joy and happiness," he said.

Of course, many days are quite tough for the athlete, but he's trying to take the good with the bad.

"I'm not trying to pretend that every day is amazing. But I have genuine moments of joy. I have laughter. I'm not thinking about it all the time. I'm back to my old self," he said.