CRP and familial Mediterranean fever: In addition, IgAV patients with homozygous/compound heterozygous or heterozygous mutations in exon 10 had significantly higher rates of gastrointestinal tract involvement, and CRP and PVAS values compared to those without FMF, whereas similar results for gastrointestinal tract involvement and PVAS were not observed in FMF patients without exon 10 mutations.