Immunohistological examination of open sacroiliac biopsies of patients with ankylosing spondylitis: detection of tumour necrosis factor alpha in two patients with early disease and transforming growth factor beta in three more advanced cases

对强直性脊柱炎患者开放性骶髂关节活检进行免疫组织化学检查：在两例早期患者中检测到肿瘤坏死因子α，在三例晚期患者中检测到转化生长因子β