Supreme Court Justice Ruth Bader Ginsburg said Saturday she's "alive" and on her way to being "very well" following radiation treatment for cancer.
Ginsburg, 86, made the comments at the Library of Congress National Book Festival in Washington. The event came a little over a week after Ginsburg disclosed that she hadfor a cancerous tumor on her pancreas and is now disease-free.
CBS News medical contributor Dr. David Agus, a cancer specialist, said radiation "is not a standard treatment for pancreatic tumors," but may be used "in someone who's very elderly and can't tolerate aggressive surgery or chemotherapy."
After treatment targeting the lesion, Agus said, "the hope is it won't recur, although there is a significant chance at some point it will."
Agus also said in a statement that the tumor had been treated "definitively" means it was treated "with the hope that they could cure it." He added, "The problem with pancreatic tumors most of the time is that there are cells elsewhere that we just can't visualize. So it's very difficult to cure them, even if you target them."
It is the fourth time over the past two decades that Ginsburg has been treated for cancer. She had colorectal cancer in 1999, pancreatic cancer in 2009 and lung cancer surgery in December.
Both liberals and conservatives watch the health of Ginsburg, who is the court's oldest justice, closely. It's understood the Supreme Court could shift to the right if Republican President Donald Trump were to gain the ability to nominate someone to replace Ginsburg.
Ginsburg, whose latest book, "In My Own Words," came out in 2016, spoke to an audience of more than 4,000 at Washington's convention center on Saturday. Near the beginning of her hour-long talk with NPR reporter Nina Totenberg, Ginsburg's health came up:
"Let me ask you a question that everyone here wants to ask," Totenberg said, "which is: How are you feeling? Why are you here instead of resting up for the term? And are you planning on staying in your current job?"
"How am I feeling? Well, first, this audience can see that I am alive," Ginsburg said to applause and cheers. Ginsburg said that she was "on my way" to being "very well." As for her work on the Supreme Court, which is on its summer break and begins hearing arguments again October 7, Ginsburg said she will "be prepared when the time comes."
Ginsburg, who was appointed by Democratic President Bill Clinton in 1993, did not directly answer how long she plans to stay on the court. Earlier this summer, however, she reported a conversation she had with former Justice John Paul Stevens, who retired from the court in 2010 at age 90. Ginsburg said she told Stevens: "My dream is to remain on the court as long as you did." Stevens responded: "Stay longer." He died in July at age 99.
Ginsburg said Saturday that she loves her job.
"It's the best and the hardest job I've ever had," she said. "It has kept me going through four cancer bouts. Instead of concentrating on my aches and pains, I just know that I have to read this set of briefs, go over the draft opinion. So I have to somehow surmount whatever is going on in my body and concentrate on the court's work."
Ginsburg's appearance Saturday was not her first following her most recent cancer announcement. Earlier this week she, where she also accepted an honorary degree. At the time, she talked only briefly about her most recent cancer scare, saying she wanted to keep her promise to attend the event despite "three weeks of daily radiation."