IL1B and glycogen storage disease VI: As compared to oligoarticular disease course, patients with polyarticular disease had lower serum levels of low-density lipoprotein cholesterol (LDL-C), lipoprotein(a) (Lp(a)), interleukin 1 receptor antagonist (IL-1RA) and progranulin, and elevated levels of interleukin-1 beta (IL-1b) and IL-1b/IL-1RA ratio.