TRDV1 and Cowden disease: The increased expression of TRDV1 in Potential CD with and without progression, Biopsy‐based CD diagnosis, and Anti‐TG2‐based CD diagnosis compared with that in Not CD could, hence, reflect an increased frequency of intraepithelial γδ T cells and may serve to measure intraepithelial γδ T cell infiltration in the mucosa.