The clinical diagnosis of primary Sjögren’s syndrome is based on the presence of symptoms of dry eyes and dry mouth, often with objective evidence of keratoconjunctivitis sicca and/or decreased salivary flow, and a positive test for serum anti-Ro antibodies or rheumatoid factor or, in the absence of these autoantibodies, a labial salivary gland biopsy showing focal lymphocytic infiltrates1. This evidence concerns the gene CALR and Keratoconjunctivitis sicca.