A rare association of ankylosing spondylitis (AS) and systemic sclerosis (SSc) is reported in a Brazilian Mestizo patient presenting a human leucocyte antigen (HLA) genotype that included HLA SSc-susceptibility genes previously reported in different ethnic groups and HLA-B27 associated with AS. The underlying genetic background supporting the full expression of both SSc- and AS-susceptibility alleles and the pertinent literature are discussed.
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