> It won't cure brain, blood cancers, or Alzheimer's.
Blood cancers are some of the most successfully-treated cancers. One of the effective--but risky--treatments of last resort is close to this futuristic fantasy you're imagining: there are leukemia/lymphoma patients who've been cured by destroying their bone marrow and then replacing it with healthy bone marrow. It's done using donor marrow, umbilical stem cells, or even the patient's own marrow that's been extracted, treated, and returned to the patient after they wipe everything out. It's pretty close to a full replacement.
Most of what you're suggesting isn't possible with any current or likely near-future technology, but curing blood cancers this way is already mainstream medicine. In some cases, patients that have undergone this treatment have also been cured of AIDS and other "incurable" diseases.
Blood cancers are some of the most successfully-treated cancers. One of the effective--but risky--treatments of last resort is close to this futuristic fantasy you're imagining: there are leukemia/lymphoma patients who've been cured by destroying their bone marrow and then replacing it with healthy bone marrow. It's done using donor marrow, umbilical stem cells, or even the patient's own marrow that's been extracted, treated, and returned to the patient after they wipe everything out. It's pretty close to a full replacement.
Most of what you're suggesting isn't possible with any current or likely near-future technology, but curing blood cancers this way is already mainstream medicine. In some cases, patients that have undergone this treatment have also been cured of AIDS and other "incurable" diseases.