What are the benefits of bone marrow transplant?

Transplant. Most of the time transplant is done to achieve complete and longer remission.
Cure. Most bone marrow or stem cell transplants are done to cure the underlying problem such as a blood cancer or bone marrow failure. In some situations they are performed to try and prolong remissions.
Cure/ long remission. In lymphoma - auto transplant( self donor) cure Myeloma - auto transplant long remission Allo transplant ( donor other than self) cure but with a chance of toxicity .