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Ethan Powell was rushed back to the hospital shortly after being released Thursday night. That according to Ethan's website, where his parents post new information every day, sometimes several times a day. There is also some good news, his father Ben, says the experimental cell transplant appears to have worked, Ethan's bone marrow is leukemia-free. Ethan did have to go back to the hospital for a fever early Friday morning, but doctors were able to bring it under control. After 100 days, Ethan's bone marrow will be checked again to make sure the leukemia hasn't come back. If he has a relapse, doctors won't have any more ways to fight the disease.