Gamma delta+ intraepithelial lymphocytes and coeliac lymphogram in a diagnostic approach to coeliac disease in patients with seronegative villous atrophy.

Abstract

The causes of seronegative villous atrophy can be grouped as coeliac or noncoeliac related. There is no consensus on how to approach subjects with seronegative coeliac disease. To evaluate the accuracy of both an increase in CD3+ T-cell receptor gamma delta+ (TCRγδ+ ) intraepithelial lymphocytes and coeliac lymphogram for the diagnosis of coeliac disease in patients with seronegative villous atrophy. Sixty-seven consecutive patients with seronegative villous atrophy were included. Duodenal biopsies to assess TCRγδ+ and CD3- by flow cytometry were performed at the index endoscopy. Coeliac lymphogram was defined as an increase in TCRγδ+ plus a decrease in CD3- intraepithelial lymphocytes. Sensitivity, specificity and Fagan's nomogram were calculated. Coeliac disease was diagnosed in 37 patients and noncoeliac villous atrophy in 30. Coeliac patients were younger (39±3 vs 55±3years; P=0.001), more often showed HLA-DQ2/8 (97.6% vs 61%; P=0.002) and had a more severe histology (61% vs 32% Marsh 3b-c; P=0.055), as compared to noncoeliac ones. Coeliac lymphogram was associated with a sensitivity of 87% (CI, 73.7-95) and specificity of 96.7% (82.7-99.9), whereas evaluating only TCRγδ+ yielded a sensitivity of 91.3% (79.2-97.6) and specificity of 83.3% (65.3-94.3). Among patients with a pre-test coeliac disease probability of 30%, post-test probabilities were 92% and 5% for positive and negative coeliac lymphogram, and 70% and 4% for positive and negative TCRγδ+ . Coeliac lymphogram was associated with a high level of diagnostic evidence either against or in favour of coeliac disease in patients with seronegative villous atrophy.