Shannen Doherty is sharing some heartbreaking news. The Beverly Hills, 90210 star says her cancer has spread to her bones, but she vows to keep fighting.

In an interview with People, the 52-year-old actress also said she hopes to become part of clinical trials, though she laments that there's yet a cure for cancer. And as she continues to go through treatment, Doherty says she is not letting anything get in the way of her raising awareness or working to battle the disease.

"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," Doherty tells the magazine. "I'm just not -- I'm not done."

The health update comes some four months after Doherty revealed that the stage 4 breast cancer she has been battling for the last few years spread to her brain. In a somber Instagram post, Doherty revealed the emotional roller coaster she went through while being placed under a machine for radiation treatment.

"My fear is obvious. I am extremely claustrophobic and there was a lot going on in my life," wrote the Charmed actress in her caption to a video showing the process of getting fitted for a mask one wears during radiation to the brain. "I am fortunate as I have great doctors like Dr Amin Mirahdi and the amazing techs at cedar sinai. But that fear…. The turmoil….. the timing of it all…. This is what cancer can look like."

Doherty was first diagnosed with breast cancer in February 2015. The cancer went into remission in 2017, but its aggressiveness was underscored when she publicly revealed in 2020 that she was diagnosed with stage 4 breast cancer.

Making matters worse, Doherty had been living with the diagnosis privately for about a year. It was only until her court case with State Farm when details of her health issues came to light, after she chose to come forward with the news herself to control the narrative surrounding her cancer.

In the years since she was first diagnosed with breast cancer, Doherty has faced a myriad of tumultuous battles, from suing her management firm and suing State Farm to filing for divorce from Kurt Iswarienko after 11 years of marriage. With so much happening since her 2015 diagnosis, ET takes a look back at Doherty's fight against the disease.

February 2015 -- The first cancer diagnosis 

Doherty sued her former management company, Tanner Mainstain, claiming that a likely mastectomy and chemotherapy treatment potentially could have been avoided had her health insurance coverage been kept up to date.

In her lawsuit, Doherty claimed the management company is to blame for an alleged lapse in her healthcare insurance. It was during that lapse, she alleged, that she went without a regular checkup, which gave the cancer a chance to spread. In her filing, Doherty claimed the Screen Actors Guild (SAG) sent a premium invoice to the firm in November 2013, but the defendants "failed to pay it (without informing [Doherty])" and then promptly terminated their relationship with" Doherty "effective Feb. 7, 2014."

It wasn't until she re-enrolled with SAG Insurance in 2015 when she finally was able to see doctors again, and that's when she was given the breast cancer diagnosis.

The complaint further claimed that "had she been insured and able to visit her doctor, the cancer could potentially have been stopped, thus obviating the need for the future treatment (including mastectomy and chemotherapy) that Plaintiff will likely have to suffer through now."

Doherty had a single mastectomy in May 2015. She struck a settlement with her former managers in August 2016.

July 2016 -- Doherty shaves her head

One of the more difficult experiences for Doherty was losing her iconic hair -- the long dark locks and blunt bangs she had sported since her Brenda Walsh days. She told ET that she had the support of family and friends. With their help, she was able to turn a heartbreaking moment into an inspiring one when she shared photos of herself shaving her head.

"After my second treatment, my hair was really matted, like in dreadlocks. And I went to try and brush it out, and it just fell out," Doherty recalled. "I just remember holding onto huge clumps of my hair in my hands, and just running to my mom crying, like, 'My hair, my hair, my hair, my hair.'"

"It was just shedding and it was driving me crazy," she continues. "It was just clumps, and I was like, 'Just grab the kitchen scissors.' And my mom's like, 'Wait, wait, wait.' I'm just, like, 'Grab it.' She went and grabbed the kitchen scissors, and put it in a ponytail and she just chopped it off. And it was this cute little bob, but it wasn't enough, you know, it was falling out."

In an emotional sit-down interview with ET, Doherty shared her outlook amid her battle.

"It's hard," she acknowledged, shedding tears. "I started thinking that I wasn't going to live... I don't look past today."

"I don't know if I'll ever look like me again," she added, wearing a scarf over her head.