To the Editor:
We thank Park, et al for their interest1 in our report2. We agree that the association between SLE and celiac disease (CD) is multifactorial, at both genetic and environmental levels, and merits further study. Interleukin 21 (IL-21), an important cytokine for B cell growth and differentiation, needs to be examined in systemic lupus erythematosus (SLE) …
Address correspondence to Dr. J.F. Ludvigsson, Department of Pediatrics, Örebro University Hospital, 701 85 Örebro, Sweden. E-mail: jonasludvigsson{at}yahoo.com