According to Eckelberry's post on GoFundMe, "Karen has [been] waging a battle for over two years with cancer. She has not talked about this publicly because she was hoping it would be cured and she could call herself a cancer survivor."

The family is raising funds for a European treatment. Contributions will cover travel, living and treatment expenses for two months.

He continued, "Karen's family physician of many years called us two weeks ago and told us of success she has had with several of her patients doing a treatment in Europe as part of a clinical study there. I cannot go into more details now, but I promise I will in the future as we get involved. I will say that this is a medically supervised program and it targets Karen's kind of cancer. In fact, we personally know two of the patients that have had remarkable recoveries from cancer there. So we know it works, and right now it is her best and only shot."

Actors such as Alan Cumming, who will star on Broadway in Macbeth, and Oscar nominee Juliette Lewis have tweeted links to the GoFundMe page.

"PLEASE HELP! The legend Karen Black has cancer and can't afford treatment that will save her life," said Cumming via Twitter.

Click here for Black's fundraising page.

Black, an Oscar nominee for "Five Easy Pieces," has also appeared on Broadway in Take Her, She's Mine; The Playroom; and Come Back to the 5 & Dime Jimmy Dean, Jimmy Dean.