Moreover, FASL was highly expressed in papillary thyroid carcinoma [20], suggesting that papillary thyroid carcinoma may increase the cytotoxic activity of T cells and the specific immune response of its own HNL, but there is not enough evidence to show whether this is a causal relationship, and more experiments and data are needed to prove it. This evidence concerns the gene FASLG and thyroid gland papillary carcinoma.