Shannen Doherty’s Heartbreaking Stage 4 Cancer Diagnosis

Actress Shannen Doherty's cancer is back.

In an ABC News interview, Doherty revealed, “It's going to come out in a matter of days or a week that I'm stage 4. So my cancer came back, and that's why I'm here. I don't think I've processed it. It's a bitter pill to swallow in a lot of ways.”

The 48-year-old admitted, “I definitely have days where I say, 'Why me?' And then I go, 'Well, why not me? Who else? Who else besides me deserves this?' None of us do. But I would say that my first reaction is always concern about how — how am I going to tell my mom, my husband."

In 2015, Doherty was first diagnosed with breast cancer and revealed that she was in remission two years later. While she was open about her cancer battle in the past, she decided to keep the diagnosis to herself this time around.

Despite her diagnosis, Shannen continued to work on the “90210” reboot. She explained, “One of the reasons — along with Luke — that I did '90210' and didn't really tell anybody because I thought, 'People can look at that other people with stage 4 can work, too.' Like, you know, our life doesn't end the minute we get that diagnosis. We still have some living to do.”

While filming 15-16 hour days, she would lean on co-star Brian Austin Green. Shannen shared, “I had moments of great anxiety where I thought, 'I can't really do this,' and Brian was the one person who — of that group of people that knew — that I told, like, pretty quickly and said, 'Here, the — this is what I'm dealing with'. So prior to shooting, he would always call me and say, 'Listen, you know, whatever happens, I have your back.' He would look at me and be like, 'We got this, kiddo'... So Brian helped me through a lot."

Doherty hopes to use her celebrity voice to make a difference in the world, saying, “I think the thing I want to do the most right now is I want to make an impact. I want to be remembered for something bigger than just me."

A few months ago, “Extra's” Renee Bargh spoke with Doherty, who stressed the importance of early detection and not giving up. She said, “I am proof that you can fight... and that you can win.”