Nearly five months after revealing that he had been diagnosed with stage 3 non-Hodgkin lymphoma, Dave Coulier is cancer-free.

A rep for the Full House star confirmed the news to PEOPLE, and his supportive costars from the phenomenally popular sitcom, which originally aired from 1987 to 1995, have shared their happy reactions.

Coulier, 65, revealed his chemotherapy treatment had ended and the numbers were looking good in a Parade interview published Monday. “[My wife] Melissa and I waited for a week to get the biopsy results back, and there is no sign of cancer,” Coulier said. “One of the few times in my life when ‘zero’ has been a great number to hear.” But he also said he was awaiting the results of a CAT scan to see if cancer would be “in the rearview mirror.”

Both Candace Cameron Bure and John Stamos cheered on their friend on Monday after talking with him.

“DAVE IS CANCER FREE!!!!,” Bure wrote. “Join me in celebrating this AMAZING news — let’s shower him with all the love in the world!”

Stamos explained that he had received the good news Sunday night while he was at Disney World. He showed a screen recording where viewers could see him grinning and holding his arm up in victory, but the audio hadn’t worked, so he narrated it. “He fought like hell with strength and heart and true to form [for] Dave, a whole lot of humor,” Stamos said. “We’d FaceTime constantly during the toughest days, trying to find something, anything to laugh about. And somehow Dave always managed to crack a joke and lift the mood and remind me and himself that joy still exists in the hardest moments.”

The men remain so close that, 30 years after their sitcom began, when Coulier began to lose his hair during treatment, Stamos wore a bald cap in solidarity. He was criticized for it, although Coulier defended him, saying that it was their way of “handling a tough time.”

And it was tough, Coulier explained to Parade.

“The symptoms were getting worse and worse with each treatment. So neuropathy, which I hadn’t experienced before, started to increase. Nausea started to increase. Dizziness started to increase,” Coulier said. “They call it chemo brain, where you’re a bit foggy — that started to increase.”

Sign up for Entertainment Weekly‘s free daily newsletter to get breaking TV news, exclusive first looks, recaps, reviews, interviews with your favorite stars, and more.

He couldn’t get out of bed during his sixth and final round of chemo.

“Though I wanted to move around and go out and, you know, work around the house, I just couldn’t,” Coulier said. “There was so much cancer-related fatigue that got progressively worse and worse and worse, and I thought, ‘Wow, this is how it’s going to go.'”