Transcript for Robin Roberts' Battle with MDS: Sister Sally-Ann Donates Bone Marrow
As you know, I'm about to embark about a journey. Tomorrow, I will take my leave of absence from "gma," to address my mds. This is my final morning for a while. There's a quote that really resonates with me. Life provides losses and heartbreak for all of us. But the greatest tragedy is to have the experience and miss the meaning. I am determined not to miss that meaning because through it, I've discovered that I have been given many gifts. Gifts that will carry me through this difficult time. Robin shared some news with us a little while back that she will share with all of you. Sometimes cancer treatment can lead to other serious medical issues. And that's what I'm facing right now. ON JUNE 11th, I SHARED WITH Everyone my latest journey. It's something that is called mds, milo plastic syndrome. My diagnosis of a rare disease. A disease I could barely pronounce. And my need for a bone marrow transplant. Kfully, my eldest sister, sally ann, is a perfect match. She's going to be my donor. Giving me the gift of life. I just want this to work. I mean, this has got to work. Reporter: Sally ann had to endure countless tests. How did it go? Easy. Reporter: And doctor visits in preparation for a donation of bone marrow. Are you scared? No. I'm not scared. I'm not scared. I know I've been asked that many times. But I just -- I don't feel any fear about the procedure. I'm looking forward to, when this is all over, going back to my old diet. Reporter: That's another thing. Our diets have been a little bit -- yeah. Reporter: When you're eating a cheeseburger, that means, I'm eating a cheeseburger. What goes into you, will go into me. I pray for three things for my sister, robin. I pray for robin to have supernatural strength, supernatural wisdom, and supernatural favor. And I want to be here to celebrate robin's 90th birthday because that would make me 98. Reporter: That's sister sally. It's also bonding moments that's meant so much to me. Doctor's appointments and car rides to and from the hospital. A shoulder to lean on. And the gift of family. It's the bumps that are going to be happening in the next few weeks. I don't want to be sick again. I've been sick. I don't feel sick right now. I don't want to be sick again. I don't want to be bald again. I don't want to be throwing up again. And then, I get very, like, listen to you. I don't want to, I don't want to, I don't want to. You will live? Yeah, I want to live. We must keep our vision on your healing. We must focus like a laser on that. We cannot allow our mind to go Good morning, america. Isaac's fury. More than two feet of relentless rain and howling winds pounding the gulf coast. Thousands evacuated. Almost 1 million without power. Now, new fears the mighty mississippi will overflow. Sam leads our extreme weather team coverage. Tornadoes touch down across the gulf coast. People battered by the hurricane and flash flooding racing to escape. And overnight, neighbors helping neighbors. Rescues happening right now. Hear their dramatic stories. Ryan's roar. The vice presidential candidate electrifies the gop with an attack on the president. What is missing is leadership in the white house. And an emotional appeal to voters. Why he says his generation can change america. ♪ Hold on ♪ and robin's journey. Our friend opens up about the battle of the road ahead. Her sister, side-by-side, as a perfect match. Why she's stronger than ever. And her special message to all of us this morning. And we do come on and say good morning, america. A thankful thursday. A.K.A. Friday eve, as I like to say. Isaac packing a big punch right now. And in new orleans, thank goodness, the levees are holding. The biggest problems for the city right now, downed power When she starts breaking out in song, my goodness. I think I hear mom calling. Right there, mom. ♪ Every hour ♪ Reporter: For my doctors, dr. Gail roboz, my oncologist, at presbyterian. And my transplant doctor, at sloan-kettering cancer center. They give me the gift of knowledge. When people have heard I'm going to have chemotherapy, they said to me, isn't that what got you in trouble to begin with? So, why are you having it again? We're getting rid of your stem cells. Now, the stem cells will never be exposed to chemotherapy. Oh. Yes. We are damaging your cells beyond recognition. We're getting rid of them. We're replacing your cells with sally's cells. Reporter: Never exposed to chemotherapy. And after you recover from transplants, you actually will get her allergies. You will get her blood type. You won't get her taste for music. Reporter: That's a relief. Promises, promises. With the knowledge I've gained, I've been able to raise awareness about the importance of being a bone marrow donor. The gift of giving. Or as mom says, make your mess your message. You could be the one to save a life. Finally, there was the gift of friendship. It was my friends who filled me with hope during my trip to italy. It was friends I've never met before. You, at home, cheering me on. My friends and the countless ones behind the scenes at "gma," that make it a joy to come to work. It's my friends who came up with the bracelets we now wear. It bares my initials and the key words for protection. The light of god surrounds me. The love of god enfolds me. Reporter: The power of god protects me. The presence of god watches over me. Reporter: Wherever I am, god is. No, the journey ahead will not be easy. But I'm going to focus on all these beautiful gifts.
This transcript has been automatically generated and may not be 100% accurate.