The minor MIF ‐173 C allele or the GC genotype has also been associated with other diseases such as rheumatoid arthritis, juvenile idiopathic arthritis, systemic sclerosis, systemic lupus erythematosus, vitiligo, and sarcoidosis.12, 19, 28, 29, 30, 31. The gene discussed is MIF; the disease is vitiligo.