HLA-B*35 was present in 29.2% of patients with inflammatory low back pain, 21.6% with reduced lumbar mobility, 23.3% with radiographic sacroiliitis, 28.9% with arthritis, 24.4% with enthesitis, and 34.6% with elevated CRP/ESR levels. The gene discussed is CRP; the disease is Sacroiliac arthritis.