Robin Quivers, longtime radio sidekick to Howard Stern, revealed Monday (Sept. 9) that she recently beat cancer after 15 months of operations, chemotherapy, and recovery. 

The 61-year-old, who has been working from home since May of last year, made the personal announcement after a caller asked when she might return to the studio. Stern says she discovered something was wrong when she could no longer urinate and was admitted to the hospital to have her bladder drained via a catheter. 

"So I went to a doctor that afternoon and for about a week the story was that nobody really understood what was going on," she said. "They knew that there was a mass in my pelvis but nobody knew what it was, and eventually it was determined that I just had to have surgery and they'd figure it out after going in."

Doctors eventually discovered that the mass was cancerous and involved uterine tissue migrating outside her uterus. 

"The tumor was about the size of a grapefruit," she said. "There were two reasons that the operation was so long. It took eight hours to remove the tumor because it was so huge, it was lying on all the organs in my pelvis, and they literally had to scrape it off when they got to it. But also, they couldn't even figure out how to operate 'cause it was so massive."

When Stern heard the news, he admits that at first he thought his longtime friend was a goner. 

"I was already making funeral arrangements," he said. "Not to make light of this situation, but I was freaking out. It was just this f***ing crazy thing that came out of left field and it was going down real quick."

Over the next several months, Quivers underwent more surgeries, as well as radiation and chemotherapy to kill of the cancer cells. All the while, she continued to work from home without the public knowing what was really going on. 

"It never occurred to me not to be on the air," Quivers said. "When I was on the air, I was pain-free."

Three months ago, doctors gave her the all-clear. 

"(The doctor) just looks at everything and she goes, 'You're cured. You're done. You can just leave here. You know, the protocol is to scan you every three months and do all this stuff, but we don't really have to, because you're cured,'" she said.

Quivers, who maintained a strict vegan diet while fighting cancer, is getting ready to release her new book "The Vegucation of Robin: How Real Food Saved My Life" on October 1st. 

“My life totally changed, and now I have this amazing amount of energy,” Quivers, who lost 70lbs in six months on the diet, told People magazine in 2010. “Changing my body has given me the ability to do all these amazing things that I never in a million years imagined I could do.” 

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