Jimmy Carter Says Latest Tests Show No Signs of Cancer

The former president said Sunday he shows no signs of cancer four months after announcing melanoma had spread to his brain.
3:18 | 12/07/15

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Transcript for Jimmy Carter Says Latest Tests Show No Signs of Cancer
America," maraschiavocampo, ABC news, New York. To the good news for jimmy Carter. Four months after revealing he had cancer, Carter says the the disease is gone. When I went this week, they didn't find cancer at all. So -- so I have good news. Reporter: This morning, startling good news by former president jimmy Carter. His cancer, undefected by brain scans. A lot of people prayed for me. I appreciate that. Reporter: Just four months ago, the outlook somber. When announcing he had stage four skin cancer that spread to his live and brain. They did an mri and found four spots of melanoma on my brain. Reporter: Doctors removed about 10% of his liver. He received radiation to treat the leash sions on his brain. And a drug that targets cancer cells. The 39th president has remained active during treatment. Attending church. Volunteering last month with his wife for habitat for humanity. While it's far too soon to say if he's cured, he remains opt misic. Stating I'll continue to receive regular three-week immunotherapy treatments. And Dr. Besser is here. What is his prognosis now? This, this is just terrific news. But it is too early to say anything about prognosis. Most doctors would want to wait three to five year. You can have microscopic amounts of tumors somewhere in the body. He'll remain on the drug as long as he can tolerate it. People tuning in, those facing cancer and their families, they're saying okay, especially when it comes to invasive melanoma, what does this mean possibly? It can give hope. Only 1 in 14 patients responded to the drug in the trial. Those who responded didn't respond as dramatically as he did. There's hope for progress. But most patients are not seeing the dramatic turnaround that president Carter seems to be seeing. What about this drug for other cancers? It was approved for lung kantser. It gives us the sense of -- we talked about the cure for cancer. Now we're talking about specific cures for a specific type of tumor. This is an example of a drug that turned on to fight cancer. What makes the cell become cancerous. And designing a designer drug there. The drugs are expensive. It give us hope that the more we understand about how our bodies fight disease, and what makes those skrels turn bad, it gives us hope for additional curious and longer life for a lot of people. Amy and I have often said, cancer is not one size fits all. It's different for everybody. And the treatments should be more tailored to what you're facing. I think a lot of patients have experienced what you're saying. Now the scientists and biologists are trying to understand, what does that mean in terms of the treatments for individual people? Here's one example. We're glad. Very happy for him. Thank you, rich. Thank you, guys. Rich will be back with new

This transcript has been automatically generated and may not be 100% accurate.

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