What are the similarities between graft versus host disease and graft rejection?

What are the similarities between graft versus host disease and graft rejection?
What are the pathophysiologic differences between graft versus host disease and graft rejection?
How would these differences be manifested clinically?
Studies have shown a protective effect of mild to moderate GVHD in cancer patients who have had a bone marrow transplant. Based on your understanding, can you explain these findings?

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