15/11/2016 4:29 AM AEDT | Updated 15/11/2016 6:43 AM AEDT

Jennie Garth And Luke Perry Honor Shannen Doherty During '90210' Reunion

The star of a recent “Beverly Hills 90210” reunion was one cast member who couldn’t be there: Shannen Doherty.

Tori Spelling, Jason Priestley, Luke Perry and Jennie Garth all attended the ’80s and ’90s –focused fan convention REWindCon over the weekend. But Doherty, who is battling breast cancer, could not attend the event in Bloomingdale, Illinois, due to her cancer treatments.

Jason LaVeris via Getty Images
Shannen Doherty attends Hollywood Unites For The 5th Biennial Stand Up to Cancer.

That didn’t stop Perry and Garth from making her influence known, however.

“None of us are up here today without Shannen,” Perry, who played Doherty’s on-screen boyfriend, Dylan, said at the conference. “She’s been through a lot. She’s not doing well right now, but sometimes her contributions are minimized.”

Perry added that Doherty was a big part of the reason why the show became so successful and named Brenda and Dylan his favorite couple of the series.

“She taught me a lot. I’m glad she was my scene partner. She was great at what she did in the character with me.”

Garth, who has been public about her rollercoaster relationship with Doherty, also posted a heartfelt message about her on-screen frenemy on Instagram:

The message reads:

to my soul sister [Shannen Doherty] strongest lady i’ve ever known. then and now. i used to be threatened by your spirit, now i’m in awe of it. you’ve taught me a lot about speaking my mind and not being afraid of my power. i’m so grateful that young me got to be friends with you. but especially “old” me! the best is yet to come on this crazy journey!! love you!

Garth confirmed in 2013 that the tense friendship her character, Kelly Taylor, had with Doherty’s Brenda extended offscreen as well.

“We were locked in this sound stage for 14-a16 hours every day,” Garth told E! about working with Doherty. “There were times when we loved each other and there were times when we wanted to claw each other’s eyes out.”

Garth also wrote about her relationship with Doherty in her book, Deep Thoughts from a Hollywood Blonde:

“It was more of just young girls finding their way and finding their individual voices. Shannen and I are both Aries women, we’re both very strong, independent women, so we butt heads a lot. Now, as grown women, we happen to get along as well.”

John Shearer via Getty Images
Shannen Doherty and Jennie Garth attend a pre-Emmys party in 2009.

Despite former feuds, the affection the former West Beverly High crew has for one another seems as sweet as a Peach Pit milkshake.

Ian Ziering, who played Steve Sanders, was also unable to make the convention. But the gang made sure to let him in on the fun with a video call.

“We have #90210 all reunions all the time, even digitally,” Ziering wrote below a screenshot from their call on Instagram.