Intestinal permeability has been found in every autoimmune disease that has test for it - celiac disease, type 1 diabetes, MS, IBS, RA and ankylosing spondylitis.

Many researchers have been hypothesizing that intentional permeability is one of the factors that is required for an autoimmune disease to develop. So I think you will likely see more studies like this. Just search for intestinal permeability on PubMed and you will find hours of endless reading. You couldn't say that 15 years ago.