LOS ANGELES, CALIFORNIA: Ian Ziering expressed his admiration for his former co-star Shannen Doherty's resilience amid stage 4 breast cancer battle.

During the 'iHeartRadio Jingle Ball 2023' on Friday, December 1 in Los Angeles, the 59-year-old actor spoke to People about his 'Beverly Hills, 90210' co-star whom he called a "fighter."

Ian Ziering says Shannen Doherty has 'got a long road in front of her'

Speaking about Doherty's unwavering strength, Ziering said, "Shannen has always been a fighter. It's not over. She's got a long road in front of her."

"She's so courageous and strong and stands as a role model to those that are facing similar adversities. She's really an incredible woman," he added.

Talking about her bonding with 'Beverly Hills, 90210' actor Brian Austin Green and also Ziering, Doherty said, "I would say out of anybody in that cast, Brian has been the one who's stayed consistent in my life."

"Brian and I never really lost touch with each other. We always checked in. We've always made a point of trying to see each other."

"I think Ian and I, it was like once we got older, we really came to appreciate each other in a very different way and be able to sit down and talk about what we were both going through as individuals back in that original 90210 days," she continued.

"But once we were all in Canada shooting the reboot ... Yeah, it often was the three Musketeers. Myself, Ian and Brian, we would just go to dinners together and hang out. It was pretty awesome," the actress added.

In September, Green also praised Doherty's strength as he stated, "Shannen is loved and she should be."

"She is a fighter. She's been facing challenges over the last, gosh, decade now that are just, they're difficult things.

"And she is absolutely leading by example and showing people that even in the toughest of times, you can keep your head up and you can be a good person," Green added.

Shannen Doherty's cancer diagnosis

Doherty who was first diagnosed with breast cancer in 2015 has been candidly speaking about her cancer journey.

Doherty has been open about her cancer journey for years. She was first diagnosed with breast cancer in 2015, which went into remission in 2017.

Her cancer went into remission in 2017 and returned in 2019.

"I’m not done with living. I’m not done with loving. I’m not done with creating. I’m not done with hopefully changing things for the better. I’m just not — I’m not done," Doherty said in November after she revealed that the cancer spread to her bones.